nuxt-icon can cause serious memory leaks.

[yaowangmx]

Describe the bug
nuxt-icon can cause serious memory leaks.

To Reproduce

Build and run the Nuxt 3 project, then perform load testing:

1. Build:

   pnpm build

2. Run server:

   node .output/server/index.mjs

3. Load test using autocannon:

   npx autocannon -c 40 -d 30 http://localhost:3000

---

1. With index.vue reduced to only a single <div>

Memory remains stable.

Test	Memory Usage
Initial	25.1M
After 1st load test	37.0M
After 2nd	44.6M
After 3rd	39.7M
After 4th	40.3M
After 5th	39.9M
After 6th	40.2M
After 5 minutes	40.2M

---

2. Restore part of the code + enable nuxt-icons

Memory usage increases dramatically and leads to OOM after several rounds.

Test	Memory Usage
Initial	20.2M
After 1st load test	1378.4M
After 2nd	2643.6M
After 3rd	3678.1M

At the 4th test, the following error appears in the console:

<--- Last few GCs --->
[30424:0000014AD5201000] 272236 ms: Mark-Compact 4014.8 (4129.0) -> 3994.8 (4124.8) MB, pooled: 0 MB, 853.34 / 0.02 ms (average mu = 0.214, current mu = 0.059) allocation failure; scavenge might not succeed
[30424:0000014AD5201000] 273138 ms: Mark-Compact 4013.8 (4128.0) -> 3993.9 (4124.0) MB, pooled: 0 MB, 869.00 / 0.01 ms (average mu = 0.131, current mu = 0.036) allocation failure; scavenge might not succeed
<--- JS stacktrace --->
FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory

---

3. Remove nuxt-icons

Memory becomes stable again.

Test	Memory Usage
Initial	20.9M
After 1st load test	38.6M
After 2nd	39.9M
After 3rd	40.6M
After 4th	41.5M
After 5th	41.5M
After 6th	41.9M
After 5 minutes	41.9M

---

package.json
{ "name": "nuxt-app", "private": true, "type": "module", "scripts": { "build": "nuxt build --dotenv .env.prod", "dev": "nuxt dev --host --dotenv .env.dev" }, "dependencies": { "@element-plus/icons-vue": "^2.3.1", "@element-plus/nuxt": "^1.0.8", "@floating-ui/dom": "1.6.0", "@internationalized/date": "^3.8.1", "@nuxtjs/i18n": "^8.5.6", "@tailwindcss/vite": "^4.1.5", "@tanstack/vue-table": "^8.21.3", "@tato30/vue-pdf": "^1.11.4", "@types/file-saver": "^2.0.7", "@unhead/vue": "1.10.4", "@vee-validate/zod": "^4.15.0", "@vueuse/core": "^13.4.0", "@zadigetvoltaire/nuxt-gtm": "^0.0.13", "alfaaz": "^1.1.0", "class-variance-authority": "^0.7.1", "dayjs": "^1.11.13", "dayjs-nuxt": "2.1.11", "echarts": "^5.6.0", "element-plus": "^2.6.3", "file-saver": "^2.0.5", "js-md5": "^0.7.3", "jspdf": "2.5.1", "katex": "^0.16.22", "lodash": "^4.17.21", "lucide-vue-next": "^0.508.0", "mupdf-webviewer": "^0.9.1", "nprogress": "^0.2.0", "nuxt": "3.18.1", "pinia": "^2.2.1", "reka-ui": "2.2.1", "rollup-plugin-visualizer": "^5.14.0", "shadcn-nuxt": "^2.1.0", "spark-md5": "^3.0.2", "tailwind-merge": "^3.2.0", "tailwindcss": "^4.1.10", "tippy.js": "^6.3.7", "tw-animate-css": "^1.2.9", "vee-validate": "^4.15.0", "vite-plugin-compression": "^0.5.1", "vite-plugin-imagemin": "^0.6.1", "vue": "^3.5.16", "vue-router": "^4.5.1", "vue-sonner": "^2.0.0", "vue3-google-login": "2.0.29", "y-protocols": "^1.0.6", "yjs": "^13.6.27" }, "devDependencies": { "@iconify/utils": "^3.1.0", "@nuxtjs/tailwindcss": "^6.12.1", "@pinia-plugin-persistedstate/nuxt": "^1.2.1", "@pinia/nuxt": "^0.5.3", "@vitejs/plugin-vue-jsx": "^4.1.2", "sass": "^1.77.8", "typescript": "^5.9.2", "vite-svg-loader": "^5.1.0", "xlsx": "^0.16.1" }, "pnpm": { "overrides": { "jiti": "^2.5.1", "vite": "^7.0.6", "prosemirror-model": "1.19.0", "vue": "3.5.16", "@vue/compiler-sfc": "3.5.16", } }, "resolutions": { "vue": "3.5.16", "@vue/compiler-sfc": "3.5.16" } }

Troubleshooting Attempts

I tried multiple dependency and configuration adjustments. The following steps showed noticeable improvements and prevented the memory leak crash:

1. Downgraded / adjusted several package versions (effective):

   nuxt: 3.12.4
   vue: 3.5.13
   @nuxtjs/i18n: ^8.3.0
   nuxt-icons: ^3.2.1
   reka-ui: 2.0.0
   shadcn-nuxt: 2.0.0
   @pinia-plugin-persistedstate/nuxt: ^1.2.1
   

2. Removed the vue-sonner package or commented out related code
   (This also reduced memory growth.)

3. Updated nuxt.config.js according to the version changes above
   (Some modules required different configuration formats.)

4. Performed load testing using:

   npx autocannon -c 40 -d 60 \
     -H "Authorization: Basic cGlwaWFkczoxMjMzMjFzdW4=" \
     https://XXXX.com

Results After Adjustments

The memory was successfully released during and after stress testing, and the server no longer crashed due to out-of-memory errors.

[2367076952]

I also encountered a memory leak issue with nuxt icons. The version is "nuxt icons": "^ 3.2.1". How did you solve it

[yaowangmx]

I also encountered a memory leak issue with nuxt icons. The version is "nuxt icons": "^ 3.2.1". How did you solve it

I removed the nuxt-icons dependency and related configurations; I extracted the author's source code and repackaged it into a NuxtIcon.vue component.
The NuxtIcon.vue code is as follows:
<template> <span class="nuxt-icon" :class="{ 'nuxt-icon--fill': !filled, 'nuxt-icon--stroke': hasStroke && !filled }" v-html="icon" /> </template>

`<script setup lang="ts">
import { ref, watchEffect } from '#imports'

const props = withDefaults(defineProps<{
name: string
filled?: boolean
}>(), {
filled: false
})

const iconsImport = import.meta.glob('/assets/icons/**/*.svg', {
eager: false,
query: '?raw',
import: 'default'
})

const icon = ref('')
let hasStroke = false

async function getIcon() {
try {
const iconPath = /assets/icons/${props.name}.svg
if (!iconsImport[iconPath]) {
console.error([nuxt-icons] Icon '${props.name}' doesn't exist in 'assets/icons')
icon.value = ''
return
}
const rawIcon = await iconsImporticonPath as string
if (rawIcon.includes('stroke')) {
hasStroke = true
}
icon.value = rawIcon
} catch (error) {
console.error([nuxt-icons] Failed to load icon '${props.name}':, error)
icon.value = ''
}
}

await getIcon()

watchEffect(getIcon)
</script>`

`<style>
.nuxt-icon {
line-height: 1;
}

.nuxt-icon svg {
width: 1em;
height: 1em;
margin-bottom: 0.125em;
vertical-align: middle;
}

.nuxt-icon.nuxt-icon--fill,
.nuxt-icon.nuxt-icon--fill * {
fill: currentColor !important;
}

.nuxt-icon.nuxt-icon--stroke,
.nuxt-icon.nuxt-icon--stroke * {
stroke: currentColor !important;
}
</style>`