feat: css sourcemap support during dev

packages/playground/css-sourcemap/__tests__/build.spec.ts

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+import { isBuild } from 'testUtils'
+
+if (isBuild) {
+  test('should not output sourcemap warning (#4939)', () => {
+    serverLogs.forEach((log) => {
+      expect(log).not.toMatch('Sourcemap is likely to be incorrect')
+    })
+  })
+} else {
+  test('this file only includes test for build', () => {
+    expect(true).toBe(true)
+  })
+}

packages/playground/css-sourcemap/__tests__/serve.spec.ts

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+import { fromComment } from 'convert-source-map'
+import { URL } from 'url'
+import { normalizePath } from 'vite'
+import { isBuild, testDir } from 'testUtils'
+
+if (!isBuild) {
+  const root = normalizePath(testDir)
+
+  const getStyleTagContentIncluding = async (content: string) => {
+    const styles = await page.$$('style')
+    for (const style of styles) {
+      const text = await style.textContent()
+      if (text.includes(content)) {
+        return text
+      }
+    }
+    throw new Error('Not found')
+  }
+
+  const extractSourcemap = (content: string) => {
+    const lines = content.trim().split('\n')
+    return fromComment(lines[lines.length - 1]).toObject()
+  }
+
+  const formatSourcemapForSnapshot = (map: any) => {
+    const m = { ...map }
+    delete m.file
+    delete m.names
+    m.sources = m.sources.map((source) => source.replace(root, '/root'))
+    return m
+  }
+
+  test('linked css', async () => {
+    const res = await page.request.get(
+      new URL('./linked.css', page.url()).href,
+      {
+        headers: {
+          accept: 'text/css'
+        }
+      }
+    )
+    const css = await res.text()
+    const lines = css.split('\n')
+    expect(lines[lines.length - 1].includes('/*')).toBe(false) // expect no sourcemap
+  })
+
+  test('linked css with import', async () => {
+    const res = await page.request.get(
+      new URL('./linked-with-import.css', page.url()).href,
+      {
+        headers: {
+          accept: 'text/css'
+        }
+      }
+    )
+    const css = await res.text()
+    const map = extractSourcemap(css)
+    expect(formatSourcemapForSnapshot(map)).toMatchInlineSnapshot(`
+      Object {
+        "mappings": "AAAA;EACE,UAAU;AACZ;;ACAA;EACE,UAAU;AACZ",
+        "sources": Array [
+          "/root/be-imported.css",
+          "/root/linked-with-import.css",
+        ],
+        "sourcesContent": Array [
+          ".be-imported {
+        color: red;
+      }
+      ",
+          "@import '@/be-imported.css';
+
+      .linked-with-import {
+        color: red;
+      }
+      ",
+        ],
+        "version": 3,
+      }
+    `)
+  })
+
+  test('imported css', async () => {
+    const css = await getStyleTagContentIncluding('.imported ')
+    const map = extractSourcemap(css)
+    expect(formatSourcemapForSnapshot(map)).toMatchInlineSnapshot(`
+      Object {
+        "mappings": "AAAA,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;AACX,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;AACb,CAAC;",
+        "sources": Array [
+          "/root/imported.css",
+        ],
+        "sourcesContent": Array [
+          ".imported {
+        color: red;
+      }
+      ",
+        ],
+        "version": 3,
+      }
+    `)
+  })
+
+  test('imported css with import', async () => {
+    const css = await getStyleTagContentIncluding('.imported-with-import ')
+    const map = extractSourcemap(css)
+    expect(formatSourcemapForSnapshot(map)).toMatchInlineSnapshot(`
+      Object {
+        "mappings": "AAAA;EACE,UAAU;AACZ;;ACAA;EACE,UAAU;AACZ",
+        "sources": Array [
+          "/root/be-imported.css",
+          "/root/imported-with-import.css",
+        ],
+        "sourcesContent": Array [
+          ".be-imported {
+        color: red;
+      }
+      ",
+          "@import '@/be-imported.css';
+
+      .imported-with-import {
+        color: red;
+      }
+      ",
+        ],
+        "version": 3,
+      }
+    `)
+  })
+
+  test('imported sass', async () => {
+    const css = await getStyleTagContentIncluding('.imported-sass ')
+    const map = extractSourcemap(css)
+    expect(formatSourcemapForSnapshot(map)).toMatchInlineSnapshot(`
+      Object {
+        "mappings": "AACE;EACE",
+        "sources": Array [
+          "/root/imported.sass",
+        ],
+        "sourcesContent": Array [
+          ".imported
+        &-sass
+          color: red
+      ",
+        ],
+        "version": 3,
+      }
+    `)
+  })
+
+  test('imported sass module', async () => {
+    const css = await getStyleTagContentIncluding('._imported-sass-module_')
+    const map = extractSourcemap(css)
+    expect(formatSourcemapForSnapshot(map)).toMatchInlineSnapshot(`
+      Object {
+        "mappings": "AACE;EACE",
+        "sources": Array [
+          "/root/imported.module.sass",
+        ],
+        "sourcesContent": Array [
+          ".imported
+        &-sass-module
+          color: red
+      ",
+        ],
+        "version": 3,
+      }
+    `)
+  })
+
+  test('imported less', async () => {
+    const css = await getStyleTagContentIncluding('.imported-less ')
+    const map = extractSourcemap(css)
+    expect(formatSourcemapForSnapshot(map)).toMatchInlineSnapshot(`
+      Object {
+        "mappings": "AACE;EACE",
+        "sources": Array [
+          "/root/imported.less",
+        ],
+        "sourcesContent": Array [
+          ".imported {
+        &-less {
+          color: @color;
+        }
+      }
+      ",
+        ],
+        "version": 3,
+      }
+    `)
+  })
+
+  test('imported stylus', async () => {
+    const css = await getStyleTagContentIncluding('.imported-stylus ')
+    const map = extractSourcemap(css)
+    expect(formatSourcemapForSnapshot(map)).toMatchInlineSnapshot(`
+      Object {
+        "mappings": "AACE;EACE,cAAM",
+        "sources": Array [
+          "/root/imported.styl",
+        ],
+        "sourcesContent": Array [
+          ".imported
+        &-stylus
+          color blue-red-mixed
+      ",
+        ],
+        "version": 3,
+      }
+    `)
+  })
+} else {
+  test('this file only includes test for serve', () => {
+    expect(true).toBe(true)
+  })
+}

packages/playground/css-sourcemap/be-imported.css

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+.be-imported {
+  color: red;
+}

packages/playground/css-sourcemap/imported-with-import.css

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+@import '@/be-imported.css';
+
+.imported-with-import {
+  color: red;
+}

packages/playground/css-sourcemap/imported.css

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+.imported {
+  color: red;
+}

packages/playground/css-sourcemap/imported.less

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+.imported {
+  &-less {
+    color: @color;
+  }
+}

packages/playground/css-sourcemap/imported.module.sass

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+.imported
+  &-sass-module
+    color: red

packages/playground/css-sourcemap/imported.sass

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+.imported
+  &-sass
+    color: red

packages/playground/css-sourcemap/imported.styl

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+.imported
+  &-stylus
+    color blue-red-mixed

packages/playground/css-sourcemap/index.html

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+<link rel="stylesheet" href="./linked.css" />
+<link rel="stylesheet" href="./linked-with-import.css" />
+
+<div class="wrapper">
+  <h1>CSS Sourcemap</h1>
+
+  <p class="linked">&lt;linked&gt;: no import</p>
+  <p class="linked-with-import">&lt;linked&gt;: with import</p>
+
+  <p class="imported">&lt;imported&gt;: no import</p>
+  <p class="imported-with-import">&lt;imported&gt;: with import</p>
+
+  <p class="imported-sass">&lt;imported sass&gt;</p>
+  <p class="imported-sass-module">&lt;imported sass&gt; with module</p>
+
+  <p class="imported-less">&lt;imported less&gt; with string additionalData</p>
+
+  <p class="imported-stylus">&lt;imported stylus&gt;</p>
+</div>
+
+<script type="module">
+  import './imported.css'
+  import './imported-with-import.css'
+
+  import './imported.sass'
+  import sassModule from './imported.module.sass'
+
+  document
+    .querySelector('.imported-sass-module')
+    .classList.add(sassModule['imported-sass-module'])
+
+  import './imported.less'
+
+  import './imported.styl'
+</script>

packages/playground/css-sourcemap/linked-with-import.css

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+@import '@/be-imported.css';
+
+.linked-with-import {
+  color: red;
+}

packages/playground/css-sourcemap/linked.css

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+.linked {
+  color: red;
+}

packages/playground/css-sourcemap/package.json

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+{
+  "name": "test-css-sourcemap",
+  "private": true,
+  "version": "0.0.0",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "debug": "node --inspect-brk ../../vite/bin/vite",
+    "preview": "vite preview"
+  },
+  "devDependencies": {
+    "convert-source-map": "^1.8.0",
+    "less": "^4.1.2",
+    "magic-string": "^0.25.7",
+    "sass": "^1.43.4",
+    "stylus": "^0.55.0"
+  }
+}

packages/playground/css-sourcemap/vite.config.js

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+const MagicString = require('magic-string')
+
+/**
+ * @type {import('vite').UserConfig}
+ */
+module.exports = {
+  resolve: {
+    alias: {
+      '@': __dirname
+    }
+  },
+  css: {
+    preprocessorOptions: {
+      less: {
+        additionalData: '@color: red;'
+      },
+      styl: {
+        additionalData: (content, filename) => {
+          const ms = new MagicString(content, { filename })
+
+          const willBeReplaced = 'blue-red-mixed'
+          const start = content.indexOf(willBeReplaced)
+          ms.overwrite(start, start + willBeReplaced.length, 'purple')
+
+          const map = ms.generateMap({ hires: true })
+          map.file = filename
+          map.sources = [filename]
+
+          return {
+            content: ms.toString(),
+            map
+          }
+        }
+      }
+    }
+  },
+  build: {
+    sourcemap: true
+  }
+}

packages/playground/vue-sourcemap/Css.vue

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+<template>
+  <p class="css">&lt;css&gt;</p>
+  <p :class="$style['css-module']">&lt;css&gt; module</p>
+  <p class="css-scoped">&lt;css&gt; scoped</p>
+</template>
+
+<style>
+.css {
+  color: red;
+}
+</style>
+
+<style module>
+.css-module {
+  color: red;
+}
+</style>
+
+<style scoped>
+.css-scoped {
+  color: red;
+}
+</style>