diff --git a/.gitignore b/.gitignore
index fee84c5..0b65fb1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 /tmp/*
 !tmp/.gitkeep
 .idea
+/src/*.d.ts
diff --git a/dist/idiomorph-ext.d.ts b/dist/idiomorph-ext.d.ts
new file mode 100644
index 0000000..e3c979b
--- /dev/null
+++ b/dist/idiomorph-ext.d.ts
@@ -0,0 +1,156 @@
+export type ConfigHead = {
+    style?: "merge" | "append" | "morph" | "none";
+    block?: boolean;
+    ignore?: boolean;
+    shouldPreserve?: (arg0: Element) => boolean;
+    shouldReAppend?: (arg0: Element) => boolean;
+    shouldRemove?: (arg0: Element) => boolean;
+    afterHeadMorphed?: (arg0: Element, arg1: {
+        added: Node[];
+        kept: Element[];
+        removed: Element[];
+    }) => void;
+};
+export type ConfigCallbacks = {
+    beforeNodeAdded?: (arg0: Node) => boolean;
+    afterNodeAdded?: (arg0: Node) => void;
+    beforeNodeMorphed?: (arg0: Element, arg1: Node) => boolean;
+    afterNodeMorphed?: (arg0: Element, arg1: Node) => void;
+    beforeNodeRemoved?: (arg0: Element) => boolean;
+    afterNodeRemoved?: (arg0: Element) => void;
+    beforeAttributeUpdated?: (arg0: string, arg1: Element, arg2: "update" | "remove") => boolean;
+};
+export type Config = {
+    morphStyle?: "outerHTML" | "innerHTML";
+    ignoreActive?: boolean;
+    ignoreActiveValue?: boolean;
+    restoreFocus?: boolean;
+    callbacks?: ConfigCallbacks;
+    head?: ConfigHead;
+};
+export type NoOp = () => void;
+export type ConfigHeadInternal = {
+    style: "merge" | "append" | "morph" | "none";
+    block?: boolean;
+    ignore?: boolean;
+    shouldPreserve: ((arg0: Element) => boolean) | NoOp;
+    shouldReAppend: ((arg0: Element) => boolean) | NoOp;
+    shouldRemove: ((arg0: Element) => boolean) | NoOp;
+    afterHeadMorphed: ((arg0: Element, arg1: {
+        added: Node[];
+        kept: Element[];
+        removed: Element[];
+    }) => void) | NoOp;
+};
+export type ConfigCallbacksInternal = {
+    beforeNodeAdded: ((arg0: Node) => boolean) | NoOp;
+    afterNodeAdded: ((arg0: Node) => void) | NoOp;
+    beforeNodeMorphed: ((arg0: Node, arg1: Node) => boolean) | NoOp;
+    afterNodeMorphed: ((arg0: Node, arg1: Node) => void) | NoOp;
+    beforeNodeRemoved: ((arg0: Node) => boolean) | NoOp;
+    afterNodeRemoved: ((arg0: Node) => void) | NoOp;
+    beforeAttributeUpdated: ((arg0: string, arg1: Element, arg2: "update" | "remove") => boolean) | NoOp;
+};
+export type ConfigInternal = {
+    morphStyle: "outerHTML" | "innerHTML";
+    ignoreActive?: boolean;
+    ignoreActiveValue?: boolean;
+    restoreFocus?: boolean;
+    callbacks: ConfigCallbacksInternal;
+    head: ConfigHeadInternal;
+};
+export type IdSets = {
+    persistentIds: Set<string>;
+    idMap: Map<Node, Set<string>>;
+};
+export type Morph = (oldNode: Element | Document, newContent: Element | Node | HTMLCollection | Node[] | string | null, config?: Config) => Promise<Node[]> | Node[];
+/**
+ * @typedef {object} ConfigHead
+ *
+ * @property {'merge' | 'append' | 'morph' | 'none'} [style]
+ * @property {boolean} [block]
+ * @property {boolean} [ignore]
+ * @property {function(Element): boolean} [shouldPreserve]
+ * @property {function(Element): boolean} [shouldReAppend]
+ * @property {function(Element): boolean} [shouldRemove]
+ * @property {function(Element, {added: Node[], kept: Element[], removed: Element[]}): void} [afterHeadMorphed]
+ */
+/**
+ * @typedef {object} ConfigCallbacks
+ *
+ * @property {function(Node): boolean} [beforeNodeAdded]
+ * @property {function(Node): void} [afterNodeAdded]
+ * @property {function(Element, Node): boolean} [beforeNodeMorphed]
+ * @property {function(Element, Node): void} [afterNodeMorphed]
+ * @property {function(Element): boolean} [beforeNodeRemoved]
+ * @property {function(Element): void} [afterNodeRemoved]
+ * @property {function(string, Element, "update" | "remove"): boolean} [beforeAttributeUpdated]
+ */
+/**
+ * @typedef {object} Config
+ *
+ * @property {'outerHTML' | 'innerHTML'} [morphStyle]
+ * @property {boolean} [ignoreActive]
+ * @property {boolean} [ignoreActiveValue]
+ * @property {boolean} [restoreFocus]
+ * @property {ConfigCallbacks} [callbacks]
+ * @property {ConfigHead} [head]
+ */
+/**
+ * @callback NoOp
+ *
+ * @returns {void}
+ */
+/**
+ * @typedef {object} ConfigHeadInternal
+ *
+ * @property {'merge' | 'append' | 'morph' | 'none'} style
+ * @property {boolean} [block]
+ * @property {boolean} [ignore]
+ * @property {(function(Element): boolean) | NoOp} shouldPreserve
+ * @property {(function(Element): boolean) | NoOp} shouldReAppend
+ * @property {(function(Element): boolean) | NoOp} shouldRemove
+ * @property {(function(Element, {added: Node[], kept: Element[], removed: Element[]}): void) | NoOp} afterHeadMorphed
+ */
+/**
+ * @typedef {object} ConfigCallbacksInternal
+ *
+ * @property {(function(Node): boolean) | NoOp} beforeNodeAdded
+ * @property {(function(Node): void) | NoOp} afterNodeAdded
+ * @property {(function(Node, Node): boolean) | NoOp} beforeNodeMorphed
+ * @property {(function(Node, Node): void) | NoOp} afterNodeMorphed
+ * @property {(function(Node): boolean) | NoOp} beforeNodeRemoved
+ * @property {(function(Node): void) | NoOp} afterNodeRemoved
+ * @property {(function(string, Element, "update" | "remove"): boolean) | NoOp} beforeAttributeUpdated
+ */
+/**
+ * @typedef {object} ConfigInternal
+ *
+ * @property {'outerHTML' | 'innerHTML'} morphStyle
+ * @property {boolean} [ignoreActive]
+ * @property {boolean} [ignoreActiveValue]
+ * @property {boolean} [restoreFocus]
+ * @property {ConfigCallbacksInternal} callbacks
+ * @property {ConfigHeadInternal} head
+ */
+/**
+ * @typedef {Object} IdSets
+ * @property {Set<string>} persistentIds
+ * @property {Map<Node, Set<string>>} idMap
+ */
+/**
+ * @callback Morph
+ *
+ * @param {Element | Document} oldNode
+ * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
+ * @param {Config} [config]
+ * @returns {Promise<Node[]> | Node[]}
+ */
+/**
+ *
+ * @type {{defaults: ConfigInternal, morph: Morph}}
+ */
+export var Idiomorph: {
+    defaults: ConfigInternal;
+    morph: Morph;
+};
diff --git a/dist/idiomorph-ext.esm.js b/dist/idiomorph-ext.esm.js
index 0fd86a5..c395099 100644
--- a/dist/idiomorph-ext.esm.js
+++ b/dist/idiomorph-ext.esm.js
@@ -36,7 +36,7 @@ import htmx from "htmx.org";
  */
 
 /**
- * @typedef {function} NoOp
+ * @callback NoOp
  *
  * @returns {void}
  */
@@ -83,12 +83,12 @@ import htmx from "htmx.org";
  */
 
 /**
- * @typedef {Function} Morph
+ * @callback Morph
  *
  * @param {Element | Document} oldNode
  * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
  * @param {Config} [config]
- * @returns {undefined | Node[]}
+ * @returns {Promise<Node[]> | Node[]}
  */
 
 // base IIFE to define idiomorph
@@ -236,7 +236,13 @@ var Idiomorph = (function () {
       activeElement?.focus();
     }
     if (activeElement && !activeElement.selectionEnd && selectionEnd) {
-      activeElement.setSelectionRange(selectionStart, selectionEnd);
+      try {
+        activeElement.setSelectionRange(selectionStart, selectionEnd);
+      } catch {
+        // the element may not support setSelectionRange: it's no longer an
+        // input/textarea after the morph, or it's an input type (number,
+        // email, date, ...) that doesn't support text selection
+      }
     }
 
     return results;
@@ -678,12 +684,13 @@ var Idiomorph = (function () {
         const oldAttributes = oldElt.attributes;
         const newAttributes = newElt.attributes;
         for (const newAttribute of newAttributes) {
-          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+          if (oldElt.getAttribute(newAttribute.name) === newAttribute.value) {
             continue;
           }
-          if (oldElt.getAttribute(newAttribute.name) !== newAttribute.value) {
-            oldElt.setAttribute(newAttribute.name, newAttribute.value);
+          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+            continue;
           }
+          oldElt.setAttribute(newAttribute.name, newAttribute.value);
         }
         // iterate backwards to avoid skipping over items when a delete occurs
         for (let i = oldAttributes.length - 1; 0 <= i; i--) {
diff --git a/dist/idiomorph-ext.js b/dist/idiomorph-ext.js
index f2243a0..60782aa 100644
--- a/dist/idiomorph-ext.js
+++ b/dist/idiomorph-ext.js
@@ -34,7 +34,7 @@
  */
 
 /**
- * @typedef {function} NoOp
+ * @callback NoOp
  *
  * @returns {void}
  */
@@ -81,12 +81,12 @@
  */
 
 /**
- * @typedef {Function} Morph
+ * @callback Morph
  *
  * @param {Element | Document} oldNode
  * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
  * @param {Config} [config]
- * @returns {undefined | Node[]}
+ * @returns {Promise<Node[]> | Node[]}
  */
 
 // base IIFE to define idiomorph
@@ -234,7 +234,13 @@ var Idiomorph = (function () {
       activeElement?.focus();
     }
     if (activeElement && !activeElement.selectionEnd && selectionEnd) {
-      activeElement.setSelectionRange(selectionStart, selectionEnd);
+      try {
+        activeElement.setSelectionRange(selectionStart, selectionEnd);
+      } catch {
+        // the element may not support setSelectionRange: it's no longer an
+        // input/textarea after the morph, or it's an input type (number,
+        // email, date, ...) that doesn't support text selection
+      }
     }
 
     return results;
@@ -676,12 +682,13 @@ var Idiomorph = (function () {
         const oldAttributes = oldElt.attributes;
         const newAttributes = newElt.attributes;
         for (const newAttribute of newAttributes) {
-          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+          if (oldElt.getAttribute(newAttribute.name) === newAttribute.value) {
             continue;
           }
-          if (oldElt.getAttribute(newAttribute.name) !== newAttribute.value) {
-            oldElt.setAttribute(newAttribute.name, newAttribute.value);
+          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+            continue;
           }
+          oldElt.setAttribute(newAttribute.name, newAttribute.value);
         }
         // iterate backwards to avoid skipping over items when a delete occurs
         for (let i = oldAttributes.length - 1; 0 <= i; i--) {
diff --git a/dist/idiomorph-ext.min.js b/dist/idiomorph-ext.min.js
index 1cb391d..758f128 100644
--- a/dist/idiomorph-ext.min.js
+++ b/dist/idiomorph-ext.min.js
@@ -1 +1 @@
-var Idiomorph=function(){"use strict";const e=()=>{};const n={morphStyle:"outerHTML",callbacks:{beforeNodeAdded:e,afterNodeAdded:e,beforeNodeMorphed:e,afterNodeMorphed:e,beforeNodeRemoved:e,afterNodeRemoved:e,beforeAttributeUpdated:e},head:{style:"merge",shouldPreserve:e=>e.getAttribute("im-preserve")==="true",shouldReAppend:e=>e.getAttribute("im-re-append")==="true",shouldRemove:e,afterHeadMorphed:e},restoreFocus:true};function t(t,e,n={}){t=d(t);const r=f(e);const i=c(t,r,n);const o=a(i,()=>{return u(i,t,r,e=>{if(e.morphStyle==="innerHTML"){s(e,t,r);return Array.from(t.childNodes)}else{return l(e,t,r)}})});i.pantry.remove();return o}function l(e,t,n){const r=f(t);s(e,r,n,t,t.nextSibling);return Array.from(r.childNodes)}function a(e,t){if(!e.config.restoreFocus)return t();let n=document.activeElement;if(!(n instanceof HTMLInputElement||n instanceof HTMLTextAreaElement)){return t()}const{id:r,selectionStart:i,selectionEnd:o}=n;const l=t();if(r&&r!==document.activeElement?.getAttribute("id")){n=e.target.querySelector(`[id="${r}"]`);n?.focus()}if(n&&!n.selectionEnd&&o){n.setSelectionRange(i,o)}return l}const s=function(){function e(e,t,n,r=null,i=null){if(t instanceof HTMLTemplateElement&&n instanceof HTMLTemplateElement){t=t.content;n=n.content}r||=t.firstChild;for(const o of n.childNodes){if(r&&r!=i){const a=f(e,o,r,i);if(a){if(a!==r){h(e,r,a)}b(a,o,e);r=a.nextSibling;continue}}if(o instanceof Element){const s=o.getAttribute("id");if(e.persistentIds.has(s)){const u=p(t,s,r,e);b(u,o,e);r=u.nextSibling;continue}}const l=d(t,o,r,e);if(l){r=l.nextSibling}}while(r&&r!=i){const c=r;r=r.nextSibling;m(e,c)}}function d(e,t,n,r){if(r.callbacks.beforeNodeAdded(t)===false)return null;if(r.idMap.has(t)){const i=document.createElement(t.tagName);e.insertBefore(i,n);b(i,t,r);r.callbacks.afterNodeAdded(i);return i}else{const o=document.importNode(t,true);e.insertBefore(o,n);r.callbacks.afterNodeAdded(o);return o}}const f=function(){function e(e,t,n,r){let i=null;let o=t.nextSibling;let l=0;let a=n;while(a&&a!=r){if(u(a,t)){if(s(e,a,t)){return a}if(i===null){if(!e.idMap.has(a)){i=a}}}if(i===null&&o&&u(a,o)){l++;o=o.nextSibling;if(l>=2){i=undefined}}if(e.activeElementAndParents.includes(a))break;a=a.nextSibling}return i||null}function s(e,t,n){let r=e.idMap.get(t);let i=e.idMap.get(n);if(!i||!r)return false;for(const o of r){if(i.has(o)){return true}}return false}function u(e,t){const n=e;const r=t;return n.nodeType===r.nodeType&&n.tagName===r.tagName&&(!n.getAttribute?.("id")||n.getAttribute?.("id")===r.getAttribute?.("id"))}return e}();function m(e,t){if(e.idMap.has(t)){l(e.pantry,t,null)}else{if(e.callbacks.beforeNodeRemoved(t)===false)return;t.parentNode?.removeChild(t);e.callbacks.afterNodeRemoved(t)}}function h(t,e,n){let r=e;while(r&&r!==n){let e=r;r=r.nextSibling;m(t,e)}return r}function p(e,t,n,r){const i=r.target.getAttribute?.("id")===t&&r.target||r.target.querySelector(`[id="${t}"]`)||r.pantry.querySelector(`[id="${t}"]`);o(i,r);l(e,i,n);return i}function o(t,n){const r=t.getAttribute("id");while(t=t.parentNode){let e=n.idMap.get(t);if(e){e.delete(r);if(!e.size){n.idMap.delete(t)}}}}function l(t,n,r){if(t.moveBefore){try{t.moveBefore(n,r)}catch(e){t.insertBefore(n,r)}}else{t.insertBefore(n,r)}}return e}();const b=function(){function e(e,t,n){if(n.ignoreActive&&e===document.activeElement){return null}if(n.callbacks.beforeNodeMorphed(e,t)===false){return e}if(e instanceof HTMLHeadElement&&n.head.ignore){}else if(e instanceof HTMLHeadElement&&n.head.style!=="morph"){m(e,t,n)}else{r(e,t,n);if(!f(e,n)){s(n,e,t)}}n.callbacks.afterNodeMorphed(e,t);return e}function r(e,t,n){let r=t.nodeType;if(r===1){const i=e;const o=t;const l=i.attributes;const a=o.attributes;for(const s of a){if(d(s.name,i,"update",n)){continue}if(i.getAttribute(s.name)!==s.value){i.setAttribute(s.name,s.value)}}for(let e=l.length-1;0<=e;e--){const u=l[e];if(!u)continue;if(!o.hasAttribute(u.name)){if(d(u.name,i,"remove",n)){continue}i.removeAttribute(u.name)}}if(!f(i,n)){c(i,o,n)}}if(r===8||r===3){if(e.nodeValue!==t.nodeValue){e.nodeValue=t.nodeValue}}}function c(n,r,i){if(n instanceof HTMLInputElement&&r instanceof HTMLInputElement&&r.type!=="file"){let e=r.value;let t=n.value;o(n,r,"checked",i);o(n,r,"disabled",i);if(!r.hasAttribute("value")){if(!d("value",n,"remove",i)){n.value="";n.removeAttribute("value")}}else if(t!==e){if(!d("value",n,"update",i)){n.setAttribute("value",e);n.value=e}}}else if(n instanceof HTMLOptionElement&&r instanceof HTMLOptionElement){o(n,r,"selected",i)}else if(n instanceof HTMLTextAreaElement&&r instanceof HTMLTextAreaElement){let e=r.value;let t=n.value;if(d("value",n,"update",i)){return}if(e!==t){n.value=e}if(n.firstChild&&n.firstChild.nodeValue!==e){n.firstChild.nodeValue=e}}}function o(e,t,n,r){const i=t[n],o=e[n];if(i!==o){const l=d(n,e,"update",r);if(!l){e[n]=t[n]}if(i){if(!l){e.setAttribute(n,"")}}else{if(!d(n,e,"remove",r)){e.removeAttribute(n)}}}}function d(e,t,n,r){if(e==="value"&&r.ignoreActiveValue&&t===document.activeElement){return true}return r.callbacks.beforeAttributeUpdated(e,t,n)===false}function f(e,t){return!!t.ignoreActiveValue&&e===document.activeElement&&e!==document.body}return e}();function u(t,e,n,r){if(t.head.block){const i=e.querySelector("head");const o=n.querySelector("head");if(i&&o){const l=m(i,o,t);return Promise.all(l).then(()=>{const e=Object.assign(t,{head:{block:false,ignore:true}});return r(e)})}}return r(t)}function m(e,t,r){let i=[];let o=[];let l=[];let a=[];let s=new Map;for(const n of t.children){s.set(n.outerHTML,n)}for(const c of e.children){let e=s.has(c.outerHTML);let t=r.head.shouldReAppend(c);let n=r.head.shouldPreserve(c);if(e||n){if(t){o.push(c)}else{s.delete(c.outerHTML);l.push(c)}}else{if(r.head.style==="append"){if(t){o.push(c);a.push(c)}}else{if(r.head.shouldRemove(c)!==false){o.push(c)}}}}a.push(...s.values());let u=[];for(const d of a){let n=document.createRange().createContextualFragment(d.outerHTML).firstChild;if(r.callbacks.beforeNodeAdded(n)!==false){if("href"in n&&n.href||"src"in n&&n.src){let t;let e=new Promise(function(e){t=e});n.addEventListener("load",function(){t()});u.push(e)}e.appendChild(n);r.callbacks.afterNodeAdded(n);i.push(n)}}for(const f of o){if(r.callbacks.beforeNodeRemoved(f)!==false){e.removeChild(f);r.callbacks.afterNodeRemoved(f)}}r.head.afterHeadMorphed(e,{added:i,kept:l,removed:o});return u}const c=function(){function e(e,t,n){const{persistentIds:r,idMap:i}=f(e,t);const o=a(n);const l=o.morphStyle||"outerHTML";if(!["innerHTML","outerHTML"].includes(l)){throw`Do not understand how to morph style ${l}`}return{target:e,newContent:t,config:o,morphStyle:l,ignoreActive:o.ignoreActive,ignoreActiveValue:o.ignoreActiveValue,restoreFocus:o.restoreFocus,idMap:i,persistentIds:r,pantry:s(),activeElementAndParents:u(e),callbacks:o.callbacks,head:o.head}}function a(e){let t=Object.assign({},n);Object.assign(t,e);t.callbacks=Object.assign({},n.callbacks,e.callbacks);t.head=Object.assign({},n.head,e.head);return t}function s(){const e=document.createElement("div");e.hidden=true;document.body.insertAdjacentElement("afterend",e);return e}function u(e){let t=[];let n=document.activeElement;if(n?.tagName!=="BODY"&&e.contains(n)){while(n){t.push(n);if(n===e)break;n=n.parentElement}}return t}function c(e){let t=Array.from(e.querySelectorAll("[id]"));if(e.getAttribute?.("id")){t.push(e)}return t}function d(n,e,r,t){for(const i of t){const o=i.getAttribute("id");if(e.has(o)){let t=i;while(t){let e=n.get(t);if(e==null){e=new Set;n.set(t,e)}e.add(o);if(t===r)break;t=t.parentElement}}}}function f(e,t){const n=c(e);const r=c(t);const i=m(n,r);let o=new Map;d(o,i,e,n);const l=t.__idiomorphRoot||t;d(o,i,l,r);return{persistentIds:i,idMap:o}}function m(e,t){let n=new Set;let r=new Map;for(const{id:o,tagName:l}of e){if(r.has(o)){n.add(o)}else{r.set(o,l)}}let i=new Set;for(const{id:o,tagName:l}of t){if(i.has(o)){n.add(o)}else if(r.get(o)===l){i.add(o)}}for(const o of n){i.delete(o)}return i}return e}();const{normalizeElement:d,normalizeParent:f}=function(){const i=new WeakSet;function e(e){if(e instanceof Document){return e.documentElement}else{return e}}function r(e){if(e==null){return document.createElement("div")}else if(typeof e==="string"){return r(l(e))}else if(i.has(e)){return e}else if(e instanceof Node){if(e.parentNode){return new o(e)}else{const t=document.createElement("div");t.append(e);return t}}else{const t=document.createElement("div");for(const n of[...e]){t.append(n)}return t}}class o{constructor(e){this.originalNode=e;this.realParentNode=e.parentNode;this.previousSibling=e.previousSibling;this.nextSibling=e.nextSibling}get childNodes(){const e=[];let t=this.previousSibling?this.previousSibling.nextSibling:this.realParentNode.firstChild;while(t&&t!=this.nextSibling){e.push(t);t=t.nextSibling}return e}querySelectorAll(r){return this.childNodes.reduce((t,e)=>{if(e instanceof Element){if(e.matches(r))t.push(e);const n=e.querySelectorAll(r);for(let e=0;e<n.length;e++){t.push(n[e])}}return t},[])}insertBefore(e,t){return this.realParentNode.insertBefore(e,t)}moveBefore(e,t){return this.realParentNode.moveBefore(e,t)}get __idiomorphRoot(){return this.originalNode}}function l(n){let r=new DOMParser;let e=n.replace(/<svg(\s[^>]*>|>)([\s\S]*?)<\/svg>/gim,"");if(e.match(/<\/html>/)||e.match(/<\/head>/)||e.match(/<\/body>/)){let t=r.parseFromString(n,"text/html");if(e.match(/<\/html>/)){i.add(t);return t}else{let e=t.firstChild;if(e){i.add(e)}return e}}else{let e=r.parseFromString("<body><template>"+n+"</template></body>","text/html");let t=e.body.querySelector("template").content;i.add(t);return t}}return{normalizeElement:e,normalizeParent:r}}();return{morph:t,defaults:n}}();(function(){function i(e){if(e==="morph"||e==="morph:outerHTML"){return{morphStyle:"outerHTML"}}else if(e==="morph:innerHTML"){return{morphStyle:"innerHTML"}}else if(e.startsWith("morph:")){return Function("return ("+e.slice(6)+")")()}}htmx.defineExtension("morph",{isInlineSwap:function(e){let t=i(e);return t?.morphStyle==="outerHTML"||t?.morphStyle==null},handleSwap:function(e,t,n){let r=i(e);if(r){return Idiomorph.morph(t,n.children,r)}}})})();
\ No newline at end of file
+var Idiomorph=function(){"use strict";const e=()=>{};const n={morphStyle:"outerHTML",callbacks:{beforeNodeAdded:e,afterNodeAdded:e,beforeNodeMorphed:e,afterNodeMorphed:e,beforeNodeRemoved:e,afterNodeRemoved:e,beforeAttributeUpdated:e},head:{style:"merge",shouldPreserve:e=>e.getAttribute("im-preserve")==="true",shouldReAppend:e=>e.getAttribute("im-re-append")==="true",shouldRemove:e,afterHeadMorphed:e},restoreFocus:true};function t(t,e,n={}){t=d(t);const r=f(e);const i=c(t,r,n);const o=a(i,()=>{return u(i,t,r,e=>{if(e.morphStyle==="innerHTML"){s(e,t,r);return Array.from(t.childNodes)}else{return l(e,t,r)}})});i.pantry.remove();return o}function l(e,t,n){const r=f(t);s(e,r,n,t,t.nextSibling);return Array.from(r.childNodes)}function a(e,t){if(!e.config.restoreFocus)return t();let n=document.activeElement;if(!(n instanceof HTMLInputElement||n instanceof HTMLTextAreaElement)){return t()}const{id:r,selectionStart:i,selectionEnd:o}=n;const l=t();if(r&&r!==document.activeElement?.getAttribute("id")){n=e.target.querySelector(`[id="${r}"]`);n?.focus()}if(n&&!n.selectionEnd&&o){try{n.setSelectionRange(i,o)}catch{}}return l}const s=function(){function e(e,t,n,r=null,i=null){if(t instanceof HTMLTemplateElement&&n instanceof HTMLTemplateElement){t=t.content;n=n.content}r||=t.firstChild;for(const o of n.childNodes){if(r&&r!=i){const a=f(e,o,r,i);if(a){if(a!==r){h(e,r,a)}b(a,o,e);r=a.nextSibling;continue}}if(o instanceof Element){const s=o.getAttribute("id");if(e.persistentIds.has(s)){const u=p(t,s,r,e);b(u,o,e);r=u.nextSibling;continue}}const l=d(t,o,r,e);if(l){r=l.nextSibling}}while(r&&r!=i){const c=r;r=r.nextSibling;m(e,c)}}function d(e,t,n,r){if(r.callbacks.beforeNodeAdded(t)===false)return null;if(r.idMap.has(t)){const i=document.createElement(t.tagName);e.insertBefore(i,n);b(i,t,r);r.callbacks.afterNodeAdded(i);return i}else{const o=document.importNode(t,true);e.insertBefore(o,n);r.callbacks.afterNodeAdded(o);return o}}const f=function(){function e(e,t,n,r){let i=null;let o=t.nextSibling;let l=0;let a=n;while(a&&a!=r){if(u(a,t)){if(s(e,a,t)){return a}if(i===null){if(!e.idMap.has(a)){i=a}}}if(i===null&&o&&u(a,o)){l++;o=o.nextSibling;if(l>=2){i=undefined}}if(e.activeElementAndParents.includes(a))break;a=a.nextSibling}return i||null}function s(e,t,n){let r=e.idMap.get(t);let i=e.idMap.get(n);if(!i||!r)return false;for(const o of r){if(i.has(o)){return true}}return false}function u(e,t){const n=e;const r=t;return n.nodeType===r.nodeType&&n.tagName===r.tagName&&(!n.getAttribute?.("id")||n.getAttribute?.("id")===r.getAttribute?.("id"))}return e}();function m(e,t){if(e.idMap.has(t)){l(e.pantry,t,null)}else{if(e.callbacks.beforeNodeRemoved(t)===false)return;t.parentNode?.removeChild(t);e.callbacks.afterNodeRemoved(t)}}function h(t,e,n){let r=e;while(r&&r!==n){let e=r;r=r.nextSibling;m(t,e)}return r}function p(e,t,n,r){const i=r.target.getAttribute?.("id")===t&&r.target||r.target.querySelector(`[id="${t}"]`)||r.pantry.querySelector(`[id="${t}"]`);o(i,r);l(e,i,n);return i}function o(t,n){const r=t.getAttribute("id");while(t=t.parentNode){let e=n.idMap.get(t);if(e){e.delete(r);if(!e.size){n.idMap.delete(t)}}}}function l(t,n,r){if(t.moveBefore){try{t.moveBefore(n,r)}catch(e){t.insertBefore(n,r)}}else{t.insertBefore(n,r)}}return e}();const b=function(){function e(e,t,n){if(n.ignoreActive&&e===document.activeElement){return null}if(n.callbacks.beforeNodeMorphed(e,t)===false){return e}if(e instanceof HTMLHeadElement&&n.head.ignore){}else if(e instanceof HTMLHeadElement&&n.head.style!=="morph"){m(e,t,n)}else{r(e,t,n);if(!f(e,n)){s(n,e,t)}}n.callbacks.afterNodeMorphed(e,t);return e}function r(e,t,n){let r=t.nodeType;if(r===1){const i=e;const o=t;const l=i.attributes;const a=o.attributes;for(const s of a){if(i.getAttribute(s.name)===s.value){continue}if(d(s.name,i,"update",n)){continue}i.setAttribute(s.name,s.value)}for(let e=l.length-1;0<=e;e--){const u=l[e];if(!u)continue;if(!o.hasAttribute(u.name)){if(d(u.name,i,"remove",n)){continue}i.removeAttribute(u.name)}}if(!f(i,n)){c(i,o,n)}}if(r===8||r===3){if(e.nodeValue!==t.nodeValue){e.nodeValue=t.nodeValue}}}function c(n,r,i){if(n instanceof HTMLInputElement&&r instanceof HTMLInputElement&&r.type!=="file"){let e=r.value;let t=n.value;o(n,r,"checked",i);o(n,r,"disabled",i);if(!r.hasAttribute("value")){if(!d("value",n,"remove",i)){n.value="";n.removeAttribute("value")}}else if(t!==e){if(!d("value",n,"update",i)){n.setAttribute("value",e);n.value=e}}}else if(n instanceof HTMLOptionElement&&r instanceof HTMLOptionElement){o(n,r,"selected",i)}else if(n instanceof HTMLTextAreaElement&&r instanceof HTMLTextAreaElement){let e=r.value;let t=n.value;if(d("value",n,"update",i)){return}if(e!==t){n.value=e}if(n.firstChild&&n.firstChild.nodeValue!==e){n.firstChild.nodeValue=e}}}function o(e,t,n,r){const i=t[n],o=e[n];if(i!==o){const l=d(n,e,"update",r);if(!l){e[n]=t[n]}if(i){if(!l){e.setAttribute(n,"")}}else{if(!d(n,e,"remove",r)){e.removeAttribute(n)}}}}function d(e,t,n,r){if(e==="value"&&r.ignoreActiveValue&&t===document.activeElement){return true}return r.callbacks.beforeAttributeUpdated(e,t,n)===false}function f(e,t){return!!t.ignoreActiveValue&&e===document.activeElement&&e!==document.body}return e}();function u(t,e,n,r){if(t.head.block){const i=e.querySelector("head");const o=n.querySelector("head");if(i&&o){const l=m(i,o,t);return Promise.all(l).then(()=>{const e=Object.assign(t,{head:{block:false,ignore:true}});return r(e)})}}return r(t)}function m(e,t,r){let i=[];let o=[];let l=[];let a=[];let s=new Map;for(const n of t.children){s.set(n.outerHTML,n)}for(const c of e.children){let e=s.has(c.outerHTML);let t=r.head.shouldReAppend(c);let n=r.head.shouldPreserve(c);if(e||n){if(t){o.push(c)}else{s.delete(c.outerHTML);l.push(c)}}else{if(r.head.style==="append"){if(t){o.push(c);a.push(c)}}else{if(r.head.shouldRemove(c)!==false){o.push(c)}}}}a.push(...s.values());let u=[];for(const d of a){let n=document.createRange().createContextualFragment(d.outerHTML).firstChild;if(r.callbacks.beforeNodeAdded(n)!==false){if("href"in n&&n.href||"src"in n&&n.src){let t;let e=new Promise(function(e){t=e});n.addEventListener("load",function(){t()});u.push(e)}e.appendChild(n);r.callbacks.afterNodeAdded(n);i.push(n)}}for(const f of o){if(r.callbacks.beforeNodeRemoved(f)!==false){e.removeChild(f);r.callbacks.afterNodeRemoved(f)}}r.head.afterHeadMorphed(e,{added:i,kept:l,removed:o});return u}const c=function(){function e(e,t,n){const{persistentIds:r,idMap:i}=f(e,t);const o=a(n);const l=o.morphStyle||"outerHTML";if(!["innerHTML","outerHTML"].includes(l)){throw`Do not understand how to morph style ${l}`}return{target:e,newContent:t,config:o,morphStyle:l,ignoreActive:o.ignoreActive,ignoreActiveValue:o.ignoreActiveValue,restoreFocus:o.restoreFocus,idMap:i,persistentIds:r,pantry:s(),activeElementAndParents:u(e),callbacks:o.callbacks,head:o.head}}function a(e){let t=Object.assign({},n);Object.assign(t,e);t.callbacks=Object.assign({},n.callbacks,e.callbacks);t.head=Object.assign({},n.head,e.head);return t}function s(){const e=document.createElement("div");e.hidden=true;document.body.insertAdjacentElement("afterend",e);return e}function u(e){let t=[];let n=document.activeElement;if(n?.tagName!=="BODY"&&e.contains(n)){while(n){t.push(n);if(n===e)break;n=n.parentElement}}return t}function c(e){let t=Array.from(e.querySelectorAll("[id]"));if(e.getAttribute?.("id")){t.push(e)}return t}function d(n,e,r,t){for(const i of t){const o=i.getAttribute("id");if(e.has(o)){let t=i;while(t){let e=n.get(t);if(e==null){e=new Set;n.set(t,e)}e.add(o);if(t===r)break;t=t.parentElement}}}}function f(e,t){const n=c(e);const r=c(t);const i=m(n,r);let o=new Map;d(o,i,e,n);const l=t.__idiomorphRoot||t;d(o,i,l,r);return{persistentIds:i,idMap:o}}function m(e,t){let n=new Set;let r=new Map;for(const{id:o,tagName:l}of e){if(r.has(o)){n.add(o)}else{r.set(o,l)}}let i=new Set;for(const{id:o,tagName:l}of t){if(i.has(o)){n.add(o)}else if(r.get(o)===l){i.add(o)}}for(const o of n){i.delete(o)}return i}return e}();const{normalizeElement:d,normalizeParent:f}=function(){const i=new WeakSet;function e(e){if(e instanceof Document){return e.documentElement}else{return e}}function r(e){if(e==null){return document.createElement("div")}else if(typeof e==="string"){return r(l(e))}else if(i.has(e)){return e}else if(e instanceof Node){if(e.parentNode){return new o(e)}else{const t=document.createElement("div");t.append(e);return t}}else{const t=document.createElement("div");for(const n of[...e]){t.append(n)}return t}}class o{constructor(e){this.originalNode=e;this.realParentNode=e.parentNode;this.previousSibling=e.previousSibling;this.nextSibling=e.nextSibling}get childNodes(){const e=[];let t=this.previousSibling?this.previousSibling.nextSibling:this.realParentNode.firstChild;while(t&&t!=this.nextSibling){e.push(t);t=t.nextSibling}return e}querySelectorAll(r){return this.childNodes.reduce((t,e)=>{if(e instanceof Element){if(e.matches(r))t.push(e);const n=e.querySelectorAll(r);for(let e=0;e<n.length;e++){t.push(n[e])}}return t},[])}insertBefore(e,t){return this.realParentNode.insertBefore(e,t)}moveBefore(e,t){return this.realParentNode.moveBefore(e,t)}get __idiomorphRoot(){return this.originalNode}}function l(n){let r=new DOMParser;let e=n.replace(/<svg(\s[^>]*>|>)([\s\S]*?)<\/svg>/gim,"");if(e.match(/<\/html>/)||e.match(/<\/head>/)||e.match(/<\/body>/)){let t=r.parseFromString(n,"text/html");if(e.match(/<\/html>/)){i.add(t);return t}else{let e=t.firstChild;if(e){i.add(e)}return e}}else{let e=r.parseFromString("<body><template>"+n+"</template></body>","text/html");let t=e.body.querySelector("template").content;i.add(t);return t}}return{normalizeElement:e,normalizeParent:r}}();return{morph:t,defaults:n}}();(function(){function i(e){if(e==="morph"||e==="morph:outerHTML"){return{morphStyle:"outerHTML"}}else if(e==="morph:innerHTML"){return{morphStyle:"innerHTML"}}else if(e.startsWith("morph:")){return Function("return ("+e.slice(6)+")")()}}htmx.defineExtension("morph",{isInlineSwap:function(e){let t=i(e);return t?.morphStyle==="outerHTML"||t?.morphStyle==null},handleSwap:function(e,t,n){let r=i(e);if(r){return Idiomorph.morph(t,n.children,r)}}})})();
\ No newline at end of file
diff --git a/dist/idiomorph.amd.js b/dist/idiomorph.amd.js
index d421071..f4d6a39 100644
--- a/dist/idiomorph.amd.js
+++ b/dist/idiomorph.amd.js
@@ -36,7 +36,7 @@ define(() => {
  */
 
 /**
- * @typedef {function} NoOp
+ * @callback NoOp
  *
  * @returns {void}
  */
@@ -83,12 +83,12 @@ define(() => {
  */
 
 /**
- * @typedef {Function} Morph
+ * @callback Morph
  *
  * @param {Element | Document} oldNode
  * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
  * @param {Config} [config]
- * @returns {undefined | Node[]}
+ * @returns {Promise<Node[]> | Node[]}
  */
 
 // base IIFE to define idiomorph
@@ -236,7 +236,13 @@ var Idiomorph = (function () {
       activeElement?.focus();
     }
     if (activeElement && !activeElement.selectionEnd && selectionEnd) {
-      activeElement.setSelectionRange(selectionStart, selectionEnd);
+      try {
+        activeElement.setSelectionRange(selectionStart, selectionEnd);
+      } catch {
+        // the element may not support setSelectionRange: it's no longer an
+        // input/textarea after the morph, or it's an input type (number,
+        // email, date, ...) that doesn't support text selection
+      }
     }
 
     return results;
@@ -678,12 +684,13 @@ var Idiomorph = (function () {
         const oldAttributes = oldElt.attributes;
         const newAttributes = newElt.attributes;
         for (const newAttribute of newAttributes) {
-          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+          if (oldElt.getAttribute(newAttribute.name) === newAttribute.value) {
             continue;
           }
-          if (oldElt.getAttribute(newAttribute.name) !== newAttribute.value) {
-            oldElt.setAttribute(newAttribute.name, newAttribute.value);
+          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+            continue;
           }
+          oldElt.setAttribute(newAttribute.name, newAttribute.value);
         }
         // iterate backwards to avoid skipping over items when a delete occurs
         for (let i = oldAttributes.length - 1; 0 <= i; i--) {
diff --git a/dist/idiomorph.cjs.js b/dist/idiomorph.cjs.js
index a716583..183fc39 100644
--- a/dist/idiomorph.cjs.js
+++ b/dist/idiomorph.cjs.js
@@ -34,7 +34,7 @@
  */
 
 /**
- * @typedef {function} NoOp
+ * @callback NoOp
  *
  * @returns {void}
  */
@@ -81,12 +81,12 @@
  */
 
 /**
- * @typedef {Function} Morph
+ * @callback Morph
  *
  * @param {Element | Document} oldNode
  * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
  * @param {Config} [config]
- * @returns {undefined | Node[]}
+ * @returns {Promise<Node[]> | Node[]}
  */
 
 // base IIFE to define idiomorph
@@ -234,7 +234,13 @@ var Idiomorph = (function () {
       activeElement?.focus();
     }
     if (activeElement && !activeElement.selectionEnd && selectionEnd) {
-      activeElement.setSelectionRange(selectionStart, selectionEnd);
+      try {
+        activeElement.setSelectionRange(selectionStart, selectionEnd);
+      } catch {
+        // the element may not support setSelectionRange: it's no longer an
+        // input/textarea after the morph, or it's an input type (number,
+        // email, date, ...) that doesn't support text selection
+      }
     }
 
     return results;
@@ -676,12 +682,13 @@ var Idiomorph = (function () {
         const oldAttributes = oldElt.attributes;
         const newAttributes = newElt.attributes;
         for (const newAttribute of newAttributes) {
-          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+          if (oldElt.getAttribute(newAttribute.name) === newAttribute.value) {
             continue;
           }
-          if (oldElt.getAttribute(newAttribute.name) !== newAttribute.value) {
-            oldElt.setAttribute(newAttribute.name, newAttribute.value);
+          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+            continue;
           }
+          oldElt.setAttribute(newAttribute.name, newAttribute.value);
         }
         // iterate backwards to avoid skipping over items when a delete occurs
         for (let i = oldAttributes.length - 1; 0 <= i; i--) {
diff --git a/dist/idiomorph.d.cts b/dist/idiomorph.d.cts
new file mode 100644
index 0000000..48da5f9
--- /dev/null
+++ b/dist/idiomorph.d.cts
@@ -0,0 +1,160 @@
+export = Idiomorph;
+/**
+ * @typedef {object} ConfigHead
+ *
+ * @property {'merge' | 'append' | 'morph' | 'none'} [style]
+ * @property {boolean} [block]
+ * @property {boolean} [ignore]
+ * @property {function(Element): boolean} [shouldPreserve]
+ * @property {function(Element): boolean} [shouldReAppend]
+ * @property {function(Element): boolean} [shouldRemove]
+ * @property {function(Element, {added: Node[], kept: Element[], removed: Element[]}): void} [afterHeadMorphed]
+ */
+/**
+ * @typedef {object} ConfigCallbacks
+ *
+ * @property {function(Node): boolean} [beforeNodeAdded]
+ * @property {function(Node): void} [afterNodeAdded]
+ * @property {function(Element, Node): boolean} [beforeNodeMorphed]
+ * @property {function(Element, Node): void} [afterNodeMorphed]
+ * @property {function(Element): boolean} [beforeNodeRemoved]
+ * @property {function(Element): void} [afterNodeRemoved]
+ * @property {function(string, Element, "update" | "remove"): boolean} [beforeAttributeUpdated]
+ */
+/**
+ * @typedef {object} Config
+ *
+ * @property {'outerHTML' | 'innerHTML'} [morphStyle]
+ * @property {boolean} [ignoreActive]
+ * @property {boolean} [ignoreActiveValue]
+ * @property {boolean} [restoreFocus]
+ * @property {ConfigCallbacks} [callbacks]
+ * @property {ConfigHead} [head]
+ */
+/**
+ * @callback NoOp
+ *
+ * @returns {void}
+ */
+/**
+ * @typedef {object} ConfigHeadInternal
+ *
+ * @property {'merge' | 'append' | 'morph' | 'none'} style
+ * @property {boolean} [block]
+ * @property {boolean} [ignore]
+ * @property {(function(Element): boolean) | NoOp} shouldPreserve
+ * @property {(function(Element): boolean) | NoOp} shouldReAppend
+ * @property {(function(Element): boolean) | NoOp} shouldRemove
+ * @property {(function(Element, {added: Node[], kept: Element[], removed: Element[]}): void) | NoOp} afterHeadMorphed
+ */
+/**
+ * @typedef {object} ConfigCallbacksInternal
+ *
+ * @property {(function(Node): boolean) | NoOp} beforeNodeAdded
+ * @property {(function(Node): void) | NoOp} afterNodeAdded
+ * @property {(function(Node, Node): boolean) | NoOp} beforeNodeMorphed
+ * @property {(function(Node, Node): void) | NoOp} afterNodeMorphed
+ * @property {(function(Node): boolean) | NoOp} beforeNodeRemoved
+ * @property {(function(Node): void) | NoOp} afterNodeRemoved
+ * @property {(function(string, Element, "update" | "remove"): boolean) | NoOp} beforeAttributeUpdated
+ */
+/**
+ * @typedef {object} ConfigInternal
+ *
+ * @property {'outerHTML' | 'innerHTML'} morphStyle
+ * @property {boolean} [ignoreActive]
+ * @property {boolean} [ignoreActiveValue]
+ * @property {boolean} [restoreFocus]
+ * @property {ConfigCallbacksInternal} callbacks
+ * @property {ConfigHeadInternal} head
+ */
+/**
+ * @typedef {Object} IdSets
+ * @property {Set<string>} persistentIds
+ * @property {Map<Node, Set<string>>} idMap
+ */
+/**
+ * @callback Morph
+ *
+ * @param {Element | Document} oldNode
+ * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
+ * @param {Config} [config]
+ * @returns {Promise<Node[]> | Node[]}
+ */
+/**
+ *
+ * @type {{defaults: ConfigInternal, morph: Morph}}
+ */
+declare var Idiomorph: {
+    defaults: ConfigInternal;
+    morph: Morph;
+};
+declare namespace Idiomorph {
+    export { ConfigHead, ConfigCallbacks, Config, NoOp, ConfigHeadInternal, ConfigCallbacksInternal, ConfigInternal, IdSets, Morph };
+}
+type ConfigHead = {
+    style?: "merge" | "append" | "morph" | "none";
+    block?: boolean;
+    ignore?: boolean;
+    shouldPreserve?: (arg0: Element) => boolean;
+    shouldReAppend?: (arg0: Element) => boolean;
+    shouldRemove?: (arg0: Element) => boolean;
+    afterHeadMorphed?: (arg0: Element, arg1: {
+        added: Node[];
+        kept: Element[];
+        removed: Element[];
+    }) => void;
+};
+type ConfigCallbacks = {
+    beforeNodeAdded?: (arg0: Node) => boolean;
+    afterNodeAdded?: (arg0: Node) => void;
+    beforeNodeMorphed?: (arg0: Element, arg1: Node) => boolean;
+    afterNodeMorphed?: (arg0: Element, arg1: Node) => void;
+    beforeNodeRemoved?: (arg0: Element) => boolean;
+    afterNodeRemoved?: (arg0: Element) => void;
+    beforeAttributeUpdated?: (arg0: string, arg1: Element, arg2: "update" | "remove") => boolean;
+};
+type Config = {
+    morphStyle?: "outerHTML" | "innerHTML";
+    ignoreActive?: boolean;
+    ignoreActiveValue?: boolean;
+    restoreFocus?: boolean;
+    callbacks?: ConfigCallbacks;
+    head?: ConfigHead;
+};
+type NoOp = () => void;
+type ConfigHeadInternal = {
+    style: "merge" | "append" | "morph" | "none";
+    block?: boolean;
+    ignore?: boolean;
+    shouldPreserve: ((arg0: Element) => boolean) | NoOp;
+    shouldReAppend: ((arg0: Element) => boolean) | NoOp;
+    shouldRemove: ((arg0: Element) => boolean) | NoOp;
+    afterHeadMorphed: ((arg0: Element, arg1: {
+        added: Node[];
+        kept: Element[];
+        removed: Element[];
+    }) => void) | NoOp;
+};
+type ConfigCallbacksInternal = {
+    beforeNodeAdded: ((arg0: Node) => boolean) | NoOp;
+    afterNodeAdded: ((arg0: Node) => void) | NoOp;
+    beforeNodeMorphed: ((arg0: Node, arg1: Node) => boolean) | NoOp;
+    afterNodeMorphed: ((arg0: Node, arg1: Node) => void) | NoOp;
+    beforeNodeRemoved: ((arg0: Node) => boolean) | NoOp;
+    afterNodeRemoved: ((arg0: Node) => void) | NoOp;
+    beforeAttributeUpdated: ((arg0: string, arg1: Element, arg2: "update" | "remove") => boolean) | NoOp;
+};
+type ConfigInternal = {
+    morphStyle: "outerHTML" | "innerHTML";
+    ignoreActive?: boolean;
+    ignoreActiveValue?: boolean;
+    restoreFocus?: boolean;
+    callbacks: ConfigCallbacksInternal;
+    head: ConfigHeadInternal;
+};
+type IdSets = {
+    persistentIds: Set<string>;
+    idMap: Map<Node, Set<string>>;
+};
+type Morph = (oldNode: Element | Document, newContent: Element | Node | HTMLCollection | Node[] | string | null, config?: Config) => Promise<Node[]> | Node[];
diff --git a/dist/idiomorph.d.ts b/dist/idiomorph.d.ts
new file mode 100644
index 0000000..e3c979b
--- /dev/null
+++ b/dist/idiomorph.d.ts
@@ -0,0 +1,156 @@
+export type ConfigHead = {
+    style?: "merge" | "append" | "morph" | "none";
+    block?: boolean;
+    ignore?: boolean;
+    shouldPreserve?: (arg0: Element) => boolean;
+    shouldReAppend?: (arg0: Element) => boolean;
+    shouldRemove?: (arg0: Element) => boolean;
+    afterHeadMorphed?: (arg0: Element, arg1: {
+        added: Node[];
+        kept: Element[];
+        removed: Element[];
+    }) => void;
+};
+export type ConfigCallbacks = {
+    beforeNodeAdded?: (arg0: Node) => boolean;
+    afterNodeAdded?: (arg0: Node) => void;
+    beforeNodeMorphed?: (arg0: Element, arg1: Node) => boolean;
+    afterNodeMorphed?: (arg0: Element, arg1: Node) => void;
+    beforeNodeRemoved?: (arg0: Element) => boolean;
+    afterNodeRemoved?: (arg0: Element) => void;
+    beforeAttributeUpdated?: (arg0: string, arg1: Element, arg2: "update" | "remove") => boolean;
+};
+export type Config = {
+    morphStyle?: "outerHTML" | "innerHTML";
+    ignoreActive?: boolean;
+    ignoreActiveValue?: boolean;
+    restoreFocus?: boolean;
+    callbacks?: ConfigCallbacks;
+    head?: ConfigHead;
+};
+export type NoOp = () => void;
+export type ConfigHeadInternal = {
+    style: "merge" | "append" | "morph" | "none";
+    block?: boolean;
+    ignore?: boolean;
+    shouldPreserve: ((arg0: Element) => boolean) | NoOp;
+    shouldReAppend: ((arg0: Element) => boolean) | NoOp;
+    shouldRemove: ((arg0: Element) => boolean) | NoOp;
+    afterHeadMorphed: ((arg0: Element, arg1: {
+        added: Node[];
+        kept: Element[];
+        removed: Element[];
+    }) => void) | NoOp;
+};
+export type ConfigCallbacksInternal = {
+    beforeNodeAdded: ((arg0: Node) => boolean) | NoOp;
+    afterNodeAdded: ((arg0: Node) => void) | NoOp;
+    beforeNodeMorphed: ((arg0: Node, arg1: Node) => boolean) | NoOp;
+    afterNodeMorphed: ((arg0: Node, arg1: Node) => void) | NoOp;
+    beforeNodeRemoved: ((arg0: Node) => boolean) | NoOp;
+    afterNodeRemoved: ((arg0: Node) => void) | NoOp;
+    beforeAttributeUpdated: ((arg0: string, arg1: Element, arg2: "update" | "remove") => boolean) | NoOp;
+};
+export type ConfigInternal = {
+    morphStyle: "outerHTML" | "innerHTML";
+    ignoreActive?: boolean;
+    ignoreActiveValue?: boolean;
+    restoreFocus?: boolean;
+    callbacks: ConfigCallbacksInternal;
+    head: ConfigHeadInternal;
+};
+export type IdSets = {
+    persistentIds: Set<string>;
+    idMap: Map<Node, Set<string>>;
+};
+export type Morph = (oldNode: Element | Document, newContent: Element | Node | HTMLCollection | Node[] | string | null, config?: Config) => Promise<Node[]> | Node[];
+/**
+ * @typedef {object} ConfigHead
+ *
+ * @property {'merge' | 'append' | 'morph' | 'none'} [style]
+ * @property {boolean} [block]
+ * @property {boolean} [ignore]
+ * @property {function(Element): boolean} [shouldPreserve]
+ * @property {function(Element): boolean} [shouldReAppend]
+ * @property {function(Element): boolean} [shouldRemove]
+ * @property {function(Element, {added: Node[], kept: Element[], removed: Element[]}): void} [afterHeadMorphed]
+ */
+/**
+ * @typedef {object} ConfigCallbacks
+ *
+ * @property {function(Node): boolean} [beforeNodeAdded]
+ * @property {function(Node): void} [afterNodeAdded]
+ * @property {function(Element, Node): boolean} [beforeNodeMorphed]
+ * @property {function(Element, Node): void} [afterNodeMorphed]
+ * @property {function(Element): boolean} [beforeNodeRemoved]
+ * @property {function(Element): void} [afterNodeRemoved]
+ * @property {function(string, Element, "update" | "remove"): boolean} [beforeAttributeUpdated]
+ */
+/**
+ * @typedef {object} Config
+ *
+ * @property {'outerHTML' | 'innerHTML'} [morphStyle]
+ * @property {boolean} [ignoreActive]
+ * @property {boolean} [ignoreActiveValue]
+ * @property {boolean} [restoreFocus]
+ * @property {ConfigCallbacks} [callbacks]
+ * @property {ConfigHead} [head]
+ */
+/**
+ * @callback NoOp
+ *
+ * @returns {void}
+ */
+/**
+ * @typedef {object} ConfigHeadInternal
+ *
+ * @property {'merge' | 'append' | 'morph' | 'none'} style
+ * @property {boolean} [block]
+ * @property {boolean} [ignore]
+ * @property {(function(Element): boolean) | NoOp} shouldPreserve
+ * @property {(function(Element): boolean) | NoOp} shouldReAppend
+ * @property {(function(Element): boolean) | NoOp} shouldRemove
+ * @property {(function(Element, {added: Node[], kept: Element[], removed: Element[]}): void) | NoOp} afterHeadMorphed
+ */
+/**
+ * @typedef {object} ConfigCallbacksInternal
+ *
+ * @property {(function(Node): boolean) | NoOp} beforeNodeAdded
+ * @property {(function(Node): void) | NoOp} afterNodeAdded
+ * @property {(function(Node, Node): boolean) | NoOp} beforeNodeMorphed
+ * @property {(function(Node, Node): void) | NoOp} afterNodeMorphed
+ * @property {(function(Node): boolean) | NoOp} beforeNodeRemoved
+ * @property {(function(Node): void) | NoOp} afterNodeRemoved
+ * @property {(function(string, Element, "update" | "remove"): boolean) | NoOp} beforeAttributeUpdated
+ */
+/**
+ * @typedef {object} ConfigInternal
+ *
+ * @property {'outerHTML' | 'innerHTML'} morphStyle
+ * @property {boolean} [ignoreActive]
+ * @property {boolean} [ignoreActiveValue]
+ * @property {boolean} [restoreFocus]
+ * @property {ConfigCallbacksInternal} callbacks
+ * @property {ConfigHeadInternal} head
+ */
+/**
+ * @typedef {Object} IdSets
+ * @property {Set<string>} persistentIds
+ * @property {Map<Node, Set<string>>} idMap
+ */
+/**
+ * @callback Morph
+ *
+ * @param {Element | Document} oldNode
+ * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
+ * @param {Config} [config]
+ * @returns {Promise<Node[]> | Node[]}
+ */
+/**
+ *
+ * @type {{defaults: ConfigInternal, morph: Morph}}
+ */
+export var Idiomorph: {
+    defaults: ConfigInternal;
+    morph: Morph;
+};
diff --git a/dist/idiomorph.esm.js b/dist/idiomorph.esm.js
index a3d6306..7a87aac 100644
--- a/dist/idiomorph.esm.js
+++ b/dist/idiomorph.esm.js
@@ -34,7 +34,7 @@
  */
 
 /**
- * @typedef {function} NoOp
+ * @callback NoOp
  *
  * @returns {void}
  */
@@ -81,12 +81,12 @@
  */
 
 /**
- * @typedef {Function} Morph
+ * @callback Morph
  *
  * @param {Element | Document} oldNode
  * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
  * @param {Config} [config]
- * @returns {undefined | Node[]}
+ * @returns {Promise<Node[]> | Node[]}
  */
 
 // base IIFE to define idiomorph
@@ -234,7 +234,13 @@ var Idiomorph = (function () {
       activeElement?.focus();
     }
     if (activeElement && !activeElement.selectionEnd && selectionEnd) {
-      activeElement.setSelectionRange(selectionStart, selectionEnd);
+      try {
+        activeElement.setSelectionRange(selectionStart, selectionEnd);
+      } catch {
+        // the element may not support setSelectionRange: it's no longer an
+        // input/textarea after the morph, or it's an input type (number,
+        // email, date, ...) that doesn't support text selection
+      }
     }
 
     return results;
@@ -676,12 +682,13 @@ var Idiomorph = (function () {
         const oldAttributes = oldElt.attributes;
         const newAttributes = newElt.attributes;
         for (const newAttribute of newAttributes) {
-          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+          if (oldElt.getAttribute(newAttribute.name) === newAttribute.value) {
             continue;
           }
-          if (oldElt.getAttribute(newAttribute.name) !== newAttribute.value) {
-            oldElt.setAttribute(newAttribute.name, newAttribute.value);
+          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+            continue;
           }
+          oldElt.setAttribute(newAttribute.name, newAttribute.value);
         }
         // iterate backwards to avoid skipping over items when a delete occurs
         for (let i = oldAttributes.length - 1; 0 <= i; i--) {
diff --git a/dist/idiomorph.js b/dist/idiomorph.js
index 2994d51..c314a09 100644
--- a/dist/idiomorph.js
+++ b/dist/idiomorph.js
@@ -34,7 +34,7 @@
  */
 
 /**
- * @typedef {function} NoOp
+ * @callback NoOp
  *
  * @returns {void}
  */
@@ -81,12 +81,12 @@
  */
 
 /**
- * @typedef {Function} Morph
+ * @callback Morph
  *
  * @param {Element | Document} oldNode
  * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
  * @param {Config} [config]
- * @returns {undefined | Node[]}
+ * @returns {Promise<Node[]> | Node[]}
  */
 
 // base IIFE to define idiomorph
@@ -234,7 +234,13 @@ var Idiomorph = (function () {
       activeElement?.focus();
     }
     if (activeElement && !activeElement.selectionEnd && selectionEnd) {
-      activeElement.setSelectionRange(selectionStart, selectionEnd);
+      try {
+        activeElement.setSelectionRange(selectionStart, selectionEnd);
+      } catch {
+        // the element may not support setSelectionRange: it's no longer an
+        // input/textarea after the morph, or it's an input type (number,
+        // email, date, ...) that doesn't support text selection
+      }
     }
 
     return results;
@@ -676,12 +682,13 @@ var Idiomorph = (function () {
         const oldAttributes = oldElt.attributes;
         const newAttributes = newElt.attributes;
         for (const newAttribute of newAttributes) {
-          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+          if (oldElt.getAttribute(newAttribute.name) === newAttribute.value) {
             continue;
           }
-          if (oldElt.getAttribute(newAttribute.name) !== newAttribute.value) {
-            oldElt.setAttribute(newAttribute.name, newAttribute.value);
+          if (ignoreAttribute(newAttribute.name, oldElt, "update", ctx)) {
+            continue;
           }
+          oldElt.setAttribute(newAttribute.name, newAttribute.value);
         }
         // iterate backwards to avoid skipping over items when a delete occurs
         for (let i = oldAttributes.length - 1; 0 <= i; i--) {
diff --git a/dist/idiomorph.min.js b/dist/idiomorph.min.js
index 3ec483f..734969c 100644
--- a/dist/idiomorph.min.js
+++ b/dist/idiomorph.min.js
@@ -1 +1 @@
-var Idiomorph=function(){"use strict";const e=()=>{};const n={morphStyle:"outerHTML",callbacks:{beforeNodeAdded:e,afterNodeAdded:e,beforeNodeMorphed:e,afterNodeMorphed:e,beforeNodeRemoved:e,afterNodeRemoved:e,beforeAttributeUpdated:e},head:{style:"merge",shouldPreserve:e=>e.getAttribute("im-preserve")==="true",shouldReAppend:e=>e.getAttribute("im-re-append")==="true",shouldRemove:e,afterHeadMorphed:e},restoreFocus:true};function t(t,e,n={}){t=d(t);const r=f(e);const i=u(t,r,n);const o=a(i,()=>{return c(i,t,r,e=>{if(e.morphStyle==="innerHTML"){s(e,t,r);return Array.from(t.childNodes)}else{return l(e,t,r)}})});i.pantry.remove();return o}function l(e,t,n){const r=f(t);s(e,r,n,t,t.nextSibling);return Array.from(r.childNodes)}function a(e,t){if(!e.config.restoreFocus)return t();let n=document.activeElement;if(!(n instanceof HTMLInputElement||n instanceof HTMLTextAreaElement)){return t()}const{id:r,selectionStart:i,selectionEnd:o}=n;const l=t();if(r&&r!==document.activeElement?.getAttribute("id")){n=e.target.querySelector(`[id="${r}"]`);n?.focus()}if(n&&!n.selectionEnd&&o){n.setSelectionRange(i,o)}return l}const s=function(){function e(e,t,n,r=null,i=null){if(t instanceof HTMLTemplateElement&&n instanceof HTMLTemplateElement){t=t.content;n=n.content}r||=t.firstChild;for(const o of n.childNodes){if(r&&r!=i){const a=f(e,o,r,i);if(a){if(a!==r){h(e,r,a)}b(a,o,e);r=a.nextSibling;continue}}if(o instanceof Element){const s=o.getAttribute("id");if(e.persistentIds.has(s)){const c=p(t,s,r,e);b(c,o,e);r=c.nextSibling;continue}}const l=d(t,o,r,e);if(l){r=l.nextSibling}}while(r&&r!=i){const u=r;r=r.nextSibling;m(e,u)}}function d(e,t,n,r){if(r.callbacks.beforeNodeAdded(t)===false)return null;if(r.idMap.has(t)){const i=document.createElement(t.tagName);e.insertBefore(i,n);b(i,t,r);r.callbacks.afterNodeAdded(i);return i}else{const o=document.importNode(t,true);e.insertBefore(o,n);r.callbacks.afterNodeAdded(o);return o}}const f=function(){function e(e,t,n,r){let i=null;let o=t.nextSibling;let l=0;let a=n;while(a&&a!=r){if(c(a,t)){if(s(e,a,t)){return a}if(i===null){if(!e.idMap.has(a)){i=a}}}if(i===null&&o&&c(a,o)){l++;o=o.nextSibling;if(l>=2){i=undefined}}if(e.activeElementAndParents.includes(a))break;a=a.nextSibling}return i||null}function s(e,t,n){let r=e.idMap.get(t);let i=e.idMap.get(n);if(!i||!r)return false;for(const o of r){if(i.has(o)){return true}}return false}function c(e,t){const n=e;const r=t;return n.nodeType===r.nodeType&&n.tagName===r.tagName&&(!n.getAttribute?.("id")||n.getAttribute?.("id")===r.getAttribute?.("id"))}return e}();function m(e,t){if(e.idMap.has(t)){l(e.pantry,t,null)}else{if(e.callbacks.beforeNodeRemoved(t)===false)return;t.parentNode?.removeChild(t);e.callbacks.afterNodeRemoved(t)}}function h(t,e,n){let r=e;while(r&&r!==n){let e=r;r=r.nextSibling;m(t,e)}return r}function p(e,t,n,r){const i=r.target.getAttribute?.("id")===t&&r.target||r.target.querySelector(`[id="${t}"]`)||r.pantry.querySelector(`[id="${t}"]`);o(i,r);l(e,i,n);return i}function o(t,n){const r=t.getAttribute("id");while(t=t.parentNode){let e=n.idMap.get(t);if(e){e.delete(r);if(!e.size){n.idMap.delete(t)}}}}function l(t,n,r){if(t.moveBefore){try{t.moveBefore(n,r)}catch(e){t.insertBefore(n,r)}}else{t.insertBefore(n,r)}}return e}();const b=function(){function e(e,t,n){if(n.ignoreActive&&e===document.activeElement){return null}if(n.callbacks.beforeNodeMorphed(e,t)===false){return e}if(e instanceof HTMLHeadElement&&n.head.ignore){}else if(e instanceof HTMLHeadElement&&n.head.style!=="morph"){m(e,t,n)}else{r(e,t,n);if(!f(e,n)){s(n,e,t)}}n.callbacks.afterNodeMorphed(e,t);return e}function r(e,t,n){let r=t.nodeType;if(r===1){const i=e;const o=t;const l=i.attributes;const a=o.attributes;for(const s of a){if(d(s.name,i,"update",n)){continue}if(i.getAttribute(s.name)!==s.value){i.setAttribute(s.name,s.value)}}for(let e=l.length-1;0<=e;e--){const c=l[e];if(!c)continue;if(!o.hasAttribute(c.name)){if(d(c.name,i,"remove",n)){continue}i.removeAttribute(c.name)}}if(!f(i,n)){u(i,o,n)}}if(r===8||r===3){if(e.nodeValue!==t.nodeValue){e.nodeValue=t.nodeValue}}}function u(n,r,i){if(n instanceof HTMLInputElement&&r instanceof HTMLInputElement&&r.type!=="file"){let e=r.value;let t=n.value;o(n,r,"checked",i);o(n,r,"disabled",i);if(!r.hasAttribute("value")){if(!d("value",n,"remove",i)){n.value="";n.removeAttribute("value")}}else if(t!==e){if(!d("value",n,"update",i)){n.setAttribute("value",e);n.value=e}}}else if(n instanceof HTMLOptionElement&&r instanceof HTMLOptionElement){o(n,r,"selected",i)}else if(n instanceof HTMLTextAreaElement&&r instanceof HTMLTextAreaElement){let e=r.value;let t=n.value;if(d("value",n,"update",i)){return}if(e!==t){n.value=e}if(n.firstChild&&n.firstChild.nodeValue!==e){n.firstChild.nodeValue=e}}}function o(e,t,n,r){const i=t[n],o=e[n];if(i!==o){const l=d(n,e,"update",r);if(!l){e[n]=t[n]}if(i){if(!l){e.setAttribute(n,"")}}else{if(!d(n,e,"remove",r)){e.removeAttribute(n)}}}}function d(e,t,n,r){if(e==="value"&&r.ignoreActiveValue&&t===document.activeElement){return true}return r.callbacks.beforeAttributeUpdated(e,t,n)===false}function f(e,t){return!!t.ignoreActiveValue&&e===document.activeElement&&e!==document.body}return e}();function c(t,e,n,r){if(t.head.block){const i=e.querySelector("head");const o=n.querySelector("head");if(i&&o){const l=m(i,o,t);return Promise.all(l).then(()=>{const e=Object.assign(t,{head:{block:false,ignore:true}});return r(e)})}}return r(t)}function m(e,t,r){let i=[];let o=[];let l=[];let a=[];let s=new Map;for(const n of t.children){s.set(n.outerHTML,n)}for(const u of e.children){let e=s.has(u.outerHTML);let t=r.head.shouldReAppend(u);let n=r.head.shouldPreserve(u);if(e||n){if(t){o.push(u)}else{s.delete(u.outerHTML);l.push(u)}}else{if(r.head.style==="append"){if(t){o.push(u);a.push(u)}}else{if(r.head.shouldRemove(u)!==false){o.push(u)}}}}a.push(...s.values());let c=[];for(const d of a){let n=document.createRange().createContextualFragment(d.outerHTML).firstChild;if(r.callbacks.beforeNodeAdded(n)!==false){if("href"in n&&n.href||"src"in n&&n.src){let t;let e=new Promise(function(e){t=e});n.addEventListener("load",function(){t()});c.push(e)}e.appendChild(n);r.callbacks.afterNodeAdded(n);i.push(n)}}for(const f of o){if(r.callbacks.beforeNodeRemoved(f)!==false){e.removeChild(f);r.callbacks.afterNodeRemoved(f)}}r.head.afterHeadMorphed(e,{added:i,kept:l,removed:o});return c}const u=function(){function e(e,t,n){const{persistentIds:r,idMap:i}=f(e,t);const o=a(n);const l=o.morphStyle||"outerHTML";if(!["innerHTML","outerHTML"].includes(l)){throw`Do not understand how to morph style ${l}`}return{target:e,newContent:t,config:o,morphStyle:l,ignoreActive:o.ignoreActive,ignoreActiveValue:o.ignoreActiveValue,restoreFocus:o.restoreFocus,idMap:i,persistentIds:r,pantry:s(),activeElementAndParents:c(e),callbacks:o.callbacks,head:o.head}}function a(e){let t=Object.assign({},n);Object.assign(t,e);t.callbacks=Object.assign({},n.callbacks,e.callbacks);t.head=Object.assign({},n.head,e.head);return t}function s(){const e=document.createElement("div");e.hidden=true;document.body.insertAdjacentElement("afterend",e);return e}function c(e){let t=[];let n=document.activeElement;if(n?.tagName!=="BODY"&&e.contains(n)){while(n){t.push(n);if(n===e)break;n=n.parentElement}}return t}function u(e){let t=Array.from(e.querySelectorAll("[id]"));if(e.getAttribute?.("id")){t.push(e)}return t}function d(n,e,r,t){for(const i of t){const o=i.getAttribute("id");if(e.has(o)){let t=i;while(t){let e=n.get(t);if(e==null){e=new Set;n.set(t,e)}e.add(o);if(t===r)break;t=t.parentElement}}}}function f(e,t){const n=u(e);const r=u(t);const i=m(n,r);let o=new Map;d(o,i,e,n);const l=t.__idiomorphRoot||t;d(o,i,l,r);return{persistentIds:i,idMap:o}}function m(e,t){let n=new Set;let r=new Map;for(const{id:o,tagName:l}of e){if(r.has(o)){n.add(o)}else{r.set(o,l)}}let i=new Set;for(const{id:o,tagName:l}of t){if(i.has(o)){n.add(o)}else if(r.get(o)===l){i.add(o)}}for(const o of n){i.delete(o)}return i}return e}();const{normalizeElement:d,normalizeParent:f}=function(){const i=new WeakSet;function e(e){if(e instanceof Document){return e.documentElement}else{return e}}function r(e){if(e==null){return document.createElement("div")}else if(typeof e==="string"){return r(l(e))}else if(i.has(e)){return e}else if(e instanceof Node){if(e.parentNode){return new o(e)}else{const t=document.createElement("div");t.append(e);return t}}else{const t=document.createElement("div");for(const n of[...e]){t.append(n)}return t}}class o{constructor(e){this.originalNode=e;this.realParentNode=e.parentNode;this.previousSibling=e.previousSibling;this.nextSibling=e.nextSibling}get childNodes(){const e=[];let t=this.previousSibling?this.previousSibling.nextSibling:this.realParentNode.firstChild;while(t&&t!=this.nextSibling){e.push(t);t=t.nextSibling}return e}querySelectorAll(r){return this.childNodes.reduce((t,e)=>{if(e instanceof Element){if(e.matches(r))t.push(e);const n=e.querySelectorAll(r);for(let e=0;e<n.length;e++){t.push(n[e])}}return t},[])}insertBefore(e,t){return this.realParentNode.insertBefore(e,t)}moveBefore(e,t){return this.realParentNode.moveBefore(e,t)}get __idiomorphRoot(){return this.originalNode}}function l(n){let r=new DOMParser;let e=n.replace(/<svg(\s[^>]*>|>)([\s\S]*?)<\/svg>/gim,"");if(e.match(/<\/html>/)||e.match(/<\/head>/)||e.match(/<\/body>/)){let t=r.parseFromString(n,"text/html");if(e.match(/<\/html>/)){i.add(t);return t}else{let e=t.firstChild;if(e){i.add(e)}return e}}else{let e=r.parseFromString("<body><template>"+n+"</template></body>","text/html");let t=e.body.querySelector("template").content;i.add(t);return t}}return{normalizeElement:e,normalizeParent:r}}();return{morph:t,defaults:n}}();
\ No newline at end of file
+var Idiomorph=function(){"use strict";const e=()=>{};const n={morphStyle:"outerHTML",callbacks:{beforeNodeAdded:e,afterNodeAdded:e,beforeNodeMorphed:e,afterNodeMorphed:e,beforeNodeRemoved:e,afterNodeRemoved:e,beforeAttributeUpdated:e},head:{style:"merge",shouldPreserve:e=>e.getAttribute("im-preserve")==="true",shouldReAppend:e=>e.getAttribute("im-re-append")==="true",shouldRemove:e,afterHeadMorphed:e},restoreFocus:true};function t(t,e,n={}){t=d(t);const r=f(e);const i=u(t,r,n);const o=a(i,()=>{return c(i,t,r,e=>{if(e.morphStyle==="innerHTML"){s(e,t,r);return Array.from(t.childNodes)}else{return l(e,t,r)}})});i.pantry.remove();return o}function l(e,t,n){const r=f(t);s(e,r,n,t,t.nextSibling);return Array.from(r.childNodes)}function a(e,t){if(!e.config.restoreFocus)return t();let n=document.activeElement;if(!(n instanceof HTMLInputElement||n instanceof HTMLTextAreaElement)){return t()}const{id:r,selectionStart:i,selectionEnd:o}=n;const l=t();if(r&&r!==document.activeElement?.getAttribute("id")){n=e.target.querySelector(`[id="${r}"]`);n?.focus()}if(n&&!n.selectionEnd&&o){try{n.setSelectionRange(i,o)}catch{}}return l}const s=function(){function e(e,t,n,r=null,i=null){if(t instanceof HTMLTemplateElement&&n instanceof HTMLTemplateElement){t=t.content;n=n.content}r||=t.firstChild;for(const o of n.childNodes){if(r&&r!=i){const a=f(e,o,r,i);if(a){if(a!==r){h(e,r,a)}b(a,o,e);r=a.nextSibling;continue}}if(o instanceof Element){const s=o.getAttribute("id");if(e.persistentIds.has(s)){const c=p(t,s,r,e);b(c,o,e);r=c.nextSibling;continue}}const l=d(t,o,r,e);if(l){r=l.nextSibling}}while(r&&r!=i){const u=r;r=r.nextSibling;m(e,u)}}function d(e,t,n,r){if(r.callbacks.beforeNodeAdded(t)===false)return null;if(r.idMap.has(t)){const i=document.createElement(t.tagName);e.insertBefore(i,n);b(i,t,r);r.callbacks.afterNodeAdded(i);return i}else{const o=document.importNode(t,true);e.insertBefore(o,n);r.callbacks.afterNodeAdded(o);return o}}const f=function(){function e(e,t,n,r){let i=null;let o=t.nextSibling;let l=0;let a=n;while(a&&a!=r){if(c(a,t)){if(s(e,a,t)){return a}if(i===null){if(!e.idMap.has(a)){i=a}}}if(i===null&&o&&c(a,o)){l++;o=o.nextSibling;if(l>=2){i=undefined}}if(e.activeElementAndParents.includes(a))break;a=a.nextSibling}return i||null}function s(e,t,n){let r=e.idMap.get(t);let i=e.idMap.get(n);if(!i||!r)return false;for(const o of r){if(i.has(o)){return true}}return false}function c(e,t){const n=e;const r=t;return n.nodeType===r.nodeType&&n.tagName===r.tagName&&(!n.getAttribute?.("id")||n.getAttribute?.("id")===r.getAttribute?.("id"))}return e}();function m(e,t){if(e.idMap.has(t)){l(e.pantry,t,null)}else{if(e.callbacks.beforeNodeRemoved(t)===false)return;t.parentNode?.removeChild(t);e.callbacks.afterNodeRemoved(t)}}function h(t,e,n){let r=e;while(r&&r!==n){let e=r;r=r.nextSibling;m(t,e)}return r}function p(e,t,n,r){const i=r.target.getAttribute?.("id")===t&&r.target||r.target.querySelector(`[id="${t}"]`)||r.pantry.querySelector(`[id="${t}"]`);o(i,r);l(e,i,n);return i}function o(t,n){const r=t.getAttribute("id");while(t=t.parentNode){let e=n.idMap.get(t);if(e){e.delete(r);if(!e.size){n.idMap.delete(t)}}}}function l(t,n,r){if(t.moveBefore){try{t.moveBefore(n,r)}catch(e){t.insertBefore(n,r)}}else{t.insertBefore(n,r)}}return e}();const b=function(){function e(e,t,n){if(n.ignoreActive&&e===document.activeElement){return null}if(n.callbacks.beforeNodeMorphed(e,t)===false){return e}if(e instanceof HTMLHeadElement&&n.head.ignore){}else if(e instanceof HTMLHeadElement&&n.head.style!=="morph"){m(e,t,n)}else{r(e,t,n);if(!f(e,n)){s(n,e,t)}}n.callbacks.afterNodeMorphed(e,t);return e}function r(e,t,n){let r=t.nodeType;if(r===1){const i=e;const o=t;const l=i.attributes;const a=o.attributes;for(const s of a){if(i.getAttribute(s.name)===s.value){continue}if(d(s.name,i,"update",n)){continue}i.setAttribute(s.name,s.value)}for(let e=l.length-1;0<=e;e--){const c=l[e];if(!c)continue;if(!o.hasAttribute(c.name)){if(d(c.name,i,"remove",n)){continue}i.removeAttribute(c.name)}}if(!f(i,n)){u(i,o,n)}}if(r===8||r===3){if(e.nodeValue!==t.nodeValue){e.nodeValue=t.nodeValue}}}function u(n,r,i){if(n instanceof HTMLInputElement&&r instanceof HTMLInputElement&&r.type!=="file"){let e=r.value;let t=n.value;o(n,r,"checked",i);o(n,r,"disabled",i);if(!r.hasAttribute("value")){if(!d("value",n,"remove",i)){n.value="";n.removeAttribute("value")}}else if(t!==e){if(!d("value",n,"update",i)){n.setAttribute("value",e);n.value=e}}}else if(n instanceof HTMLOptionElement&&r instanceof HTMLOptionElement){o(n,r,"selected",i)}else if(n instanceof HTMLTextAreaElement&&r instanceof HTMLTextAreaElement){let e=r.value;let t=n.value;if(d("value",n,"update",i)){return}if(e!==t){n.value=e}if(n.firstChild&&n.firstChild.nodeValue!==e){n.firstChild.nodeValue=e}}}function o(e,t,n,r){const i=t[n],o=e[n];if(i!==o){const l=d(n,e,"update",r);if(!l){e[n]=t[n]}if(i){if(!l){e.setAttribute(n,"")}}else{if(!d(n,e,"remove",r)){e.removeAttribute(n)}}}}function d(e,t,n,r){if(e==="value"&&r.ignoreActiveValue&&t===document.activeElement){return true}return r.callbacks.beforeAttributeUpdated(e,t,n)===false}function f(e,t){return!!t.ignoreActiveValue&&e===document.activeElement&&e!==document.body}return e}();function c(t,e,n,r){if(t.head.block){const i=e.querySelector("head");const o=n.querySelector("head");if(i&&o){const l=m(i,o,t);return Promise.all(l).then(()=>{const e=Object.assign(t,{head:{block:false,ignore:true}});return r(e)})}}return r(t)}function m(e,t,r){let i=[];let o=[];let l=[];let a=[];let s=new Map;for(const n of t.children){s.set(n.outerHTML,n)}for(const u of e.children){let e=s.has(u.outerHTML);let t=r.head.shouldReAppend(u);let n=r.head.shouldPreserve(u);if(e||n){if(t){o.push(u)}else{s.delete(u.outerHTML);l.push(u)}}else{if(r.head.style==="append"){if(t){o.push(u);a.push(u)}}else{if(r.head.shouldRemove(u)!==false){o.push(u)}}}}a.push(...s.values());let c=[];for(const d of a){let n=document.createRange().createContextualFragment(d.outerHTML).firstChild;if(r.callbacks.beforeNodeAdded(n)!==false){if("href"in n&&n.href||"src"in n&&n.src){let t;let e=new Promise(function(e){t=e});n.addEventListener("load",function(){t()});c.push(e)}e.appendChild(n);r.callbacks.afterNodeAdded(n);i.push(n)}}for(const f of o){if(r.callbacks.beforeNodeRemoved(f)!==false){e.removeChild(f);r.callbacks.afterNodeRemoved(f)}}r.head.afterHeadMorphed(e,{added:i,kept:l,removed:o});return c}const u=function(){function e(e,t,n){const{persistentIds:r,idMap:i}=f(e,t);const o=a(n);const l=o.morphStyle||"outerHTML";if(!["innerHTML","outerHTML"].includes(l)){throw`Do not understand how to morph style ${l}`}return{target:e,newContent:t,config:o,morphStyle:l,ignoreActive:o.ignoreActive,ignoreActiveValue:o.ignoreActiveValue,restoreFocus:o.restoreFocus,idMap:i,persistentIds:r,pantry:s(),activeElementAndParents:c(e),callbacks:o.callbacks,head:o.head}}function a(e){let t=Object.assign({},n);Object.assign(t,e);t.callbacks=Object.assign({},n.callbacks,e.callbacks);t.head=Object.assign({},n.head,e.head);return t}function s(){const e=document.createElement("div");e.hidden=true;document.body.insertAdjacentElement("afterend",e);return e}function c(e){let t=[];let n=document.activeElement;if(n?.tagName!=="BODY"&&e.contains(n)){while(n){t.push(n);if(n===e)break;n=n.parentElement}}return t}function u(e){let t=Array.from(e.querySelectorAll("[id]"));if(e.getAttribute?.("id")){t.push(e)}return t}function d(n,e,r,t){for(const i of t){const o=i.getAttribute("id");if(e.has(o)){let t=i;while(t){let e=n.get(t);if(e==null){e=new Set;n.set(t,e)}e.add(o);if(t===r)break;t=t.parentElement}}}}function f(e,t){const n=u(e);const r=u(t);const i=m(n,r);let o=new Map;d(o,i,e,n);const l=t.__idiomorphRoot||t;d(o,i,l,r);return{persistentIds:i,idMap:o}}function m(e,t){let n=new Set;let r=new Map;for(const{id:o,tagName:l}of e){if(r.has(o)){n.add(o)}else{r.set(o,l)}}let i=new Set;for(const{id:o,tagName:l}of t){if(i.has(o)){n.add(o)}else if(r.get(o)===l){i.add(o)}}for(const o of n){i.delete(o)}return i}return e}();const{normalizeElement:d,normalizeParent:f}=function(){const i=new WeakSet;function e(e){if(e instanceof Document){return e.documentElement}else{return e}}function r(e){if(e==null){return document.createElement("div")}else if(typeof e==="string"){return r(l(e))}else if(i.has(e)){return e}else if(e instanceof Node){if(e.parentNode){return new o(e)}else{const t=document.createElement("div");t.append(e);return t}}else{const t=document.createElement("div");for(const n of[...e]){t.append(n)}return t}}class o{constructor(e){this.originalNode=e;this.realParentNode=e.parentNode;this.previousSibling=e.previousSibling;this.nextSibling=e.nextSibling}get childNodes(){const e=[];let t=this.previousSibling?this.previousSibling.nextSibling:this.realParentNode.firstChild;while(t&&t!=this.nextSibling){e.push(t);t=t.nextSibling}return e}querySelectorAll(r){return this.childNodes.reduce((t,e)=>{if(e instanceof Element){if(e.matches(r))t.push(e);const n=e.querySelectorAll(r);for(let e=0;e<n.length;e++){t.push(n[e])}}return t},[])}insertBefore(e,t){return this.realParentNode.insertBefore(e,t)}moveBefore(e,t){return this.realParentNode.moveBefore(e,t)}get __idiomorphRoot(){return this.originalNode}}function l(n){let r=new DOMParser;let e=n.replace(/<svg(\s[^>]*>|>)([\s\S]*?)<\/svg>/gim,"");if(e.match(/<\/html>/)||e.match(/<\/head>/)||e.match(/<\/body>/)){let t=r.parseFromString(n,"text/html");if(e.match(/<\/html>/)){i.add(t);return t}else{let e=t.firstChild;if(e){i.add(e)}return e}}else{let e=r.parseFromString("<body><template>"+n+"</template></body>","text/html");let t=e.body.querySelector("template").content;i.add(t);return t}}return{normalizeElement:e,normalizeParent:r}}();return{morph:t,defaults:n}}();
\ No newline at end of file
diff --git a/dist/idiomorph.min.js.gz b/dist/idiomorph.min.js.gz
index 581998f..d0663cd 100644
Binary files a/dist/idiomorph.min.js.gz and b/dist/idiomorph.min.js.gz differ
diff --git a/package.json b/package.json
index 3a0a54a..e6357bd 100644
--- a/package.json
+++ b/package.json
@@ -13,17 +13,29 @@
   "files": [
     "LICENSE",
     "README.md",
-    "dist/*.js"
+    "dist/*.js",
+    "dist/*.d.ts",
+    "dist/*.d.cts"
   ],
   "main": "dist/idiomorph.js",
   "module": "dist/idiomorph.esm.js",
+  "types": "dist/idiomorph.d.ts",
   "unpkg": "dist/idiomorph.min.js",
   "exports": {
     ".": {
-      "require": "./dist/idiomorph.cjs.js",
-      "import": "./dist/idiomorph.esm.js"
+      "import": {
+        "types": "./dist/idiomorph.d.ts",
+        "default": "./dist/idiomorph.esm.js"
+      },
+      "require": {
+        "types": "./dist/idiomorph.d.cts",
+        "default": "./dist/idiomorph.cjs.js"
+      }
+    },
+    "./htmx": {
+      "types": "./dist/idiomorph-ext.d.ts",
+      "import": "./dist/idiomorph-ext.esm.js"
     },
-    "./htmx": "./dist/idiomorph-ext.esm.js",
     "./dist/*": "./dist/*"
   },
   "scripts": {
@@ -40,7 +52,8 @@
     "cjs": "(cat src/idiomorph.js && echo \"\nmodule.exports = Idiomorph;\") > dist/idiomorph.cjs.js",
     "esm": "(cat src/idiomorph.js && echo \"\nexport {Idiomorph};\") > dist/idiomorph.esm.js && (echo \"import htmx from \\\"htmx.org\\\";\n\" && cat dist/idiomorph-ext.js && echo \"\nexport {Idiomorph};\") > dist/idiomorph-ext.esm.js",
     "gen-modules": "npm run-script amd && npm run-script cjs && npm run-script esm",
-    "dist": "cp -r src/* dist/ && cat src/idiomorph.js src/idiomorph-htmx.js > dist/idiomorph-ext.js && npm run-script gen-modules && npm run-script uglify && gzip -9 -k -f dist/idiomorph.min.js > dist/idiomorph.min.js.gz && exit",
+    "types": "tsc dist/idiomorph.esm.js dist/idiomorph.cjs.js dist/idiomorph-ext.esm.js --declaration --emitDeclarationOnly --allowJs --skipLibCheck --outDir dist && mv dist/idiomorph.esm.d.ts dist/idiomorph.d.ts && mv dist/idiomorph.cjs.d.ts dist/idiomorph.d.cts && mv dist/idiomorph-ext.esm.d.ts dist/idiomorph-ext.d.ts",
+    "dist": "cp -r src/*.js dist/ && cat src/idiomorph.js src/idiomorph-htmx.js > dist/idiomorph-ext.js && npm run-script gen-modules && npm run-script types && npm run-script uglify && gzip -9 -k -f dist/idiomorph.min.js > dist/idiomorph.min.js.gz && exit",
     "uglify": "uglifyjs -m eval -o dist/idiomorph.min.js dist/idiomorph.js && uglifyjs -m eval -o dist/idiomorph-ext.min.js dist/idiomorph-ext.js",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
diff --git a/src/idiomorph.js b/src/idiomorph.js
index 257c040..c314a09 100644
--- a/src/idiomorph.js
+++ b/src/idiomorph.js
@@ -34,7 +34,7 @@
  */
 
 /**
- * @typedef {function} NoOp
+ * @callback NoOp
  *
  * @returns {void}
  */
@@ -81,12 +81,12 @@
  */
 
 /**
- * @typedef {Function} Morph
+ * @callback Morph
  *
  * @param {Element | Document} oldNode
  * @param {Element | Node | HTMLCollection | Node[] | string | null} newContent
  * @param {Config} [config]
- * @returns {undefined | Node[]}
+ * @returns {Promise<Node[]> | Node[]}
  */
 
 // base IIFE to define idiomorph