fix: patch dist ESM import extensions

package.json

@@ -45,8 +45,8 @@
     "example:export-tools": "tsx examples/minimal-agent/export-tools.ts",
     "example:x402-eip712": "tsx examples/x402-payment-flow/eip712-full-flow.ts",
     "typecheck": "tsc --noEmit",
-    "clean": "rm -rf dist",
-    "build": "pnpm run clean && tsc",
+    "clean": "node scripts/clean.mjs",
+    "build": "node scripts/clean.mjs && tsc && node scripts/fix-esm-imports.mjs",
     "lint": "eslint .",
     "format": "prettier --write .",
     "format:check": "prettier --check .",

scripts/clean.mjs

@@ -0,0 +1,3 @@
+import { rm } from 'node:fs/promises';
+
+await rm(new URL('../dist/', import.meta.url), { recursive: true, force: true });

scripts/fix-esm-imports.mjs

@@ -0,0 +1,70 @@
+import { readdir, readFile, stat, writeFile } from 'node:fs/promises';
+import { extname, join } from 'node:path';
+import { fileURLToPath, pathToFileURL } from 'node:url';
+
+const DIST_DIR = fileURLToPath(new URL('../dist/', import.meta.url));
+const importSpecifierPattern =
+  /(?<prefix>\bfrom\s+['"]|\bimport\s*\(\s*['"]|\bexport\s+[^'";]*?\s+from\s+['"])(?<specifier>\.{1,2}\/[^'"?#]+)(?<suffix>['"])/g;
+const supportedExtensions = new Set(['.js', '.mjs', '.cjs', '.json', '.node']);
+
+async function exists(pathOrUrl) {
+  try {
+    await stat(pathOrUrl);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+async function* walk(dir) {
+  for (const entry of await readdir(dir, { withFileTypes: true })) {
+    const path = join(dir, entry.name);
+    if (entry.isDirectory()) {
+      yield* walk(path);
+    } else if (entry.isFile()) {
+      yield path;
+    }
+  }
+}
+
+async function resolveRuntimeSpecifier(filePath, specifier) {
+  if (supportedExtensions.has(extname(specifier))) {
+    return specifier;
+  }
+
+  const sourceUrl = pathToFileURL(filePath);
+  const fileTarget = new URL(`${specifier}.js`, sourceUrl);
+  if (await exists(fileTarget)) {
+    return `${specifier}.js`;
+  }
+
+  const indexTarget = new URL(`${specifier}/index.js`, sourceUrl);
+  if (await exists(indexTarget)) {
+    return `${specifier}/index.js`;
+  }
+
+  return specifier;
+}
+
+for await (const filePath of walk(DIST_DIR)) {
+  if (!(filePath.endsWith('.js') || filePath.endsWith('.d.ts'))) {
+    continue;
+  }
+
+  const source = await readFile(filePath, 'utf8');
+  const replacements = await Promise.all(
+    [...source.matchAll(importSpecifierPattern)].map(async (match) => {
+      const fixedSpecifier = await resolveRuntimeSpecifier(filePath, match.groups.specifier);
+      return [match[0], `${match.groups.prefix}${fixedSpecifier}${match.groups.suffix}`];
+    }),
+  );
+
+  let fixed = source;
+  for (const [from, to] of replacements) {
+    fixed = fixed.replace(from, to);
+  }
+
+  if (fixed !== source) {
+    await writeFile(filePath, fixed);
+  }
+}