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Merged
RobinMalfait merged 4 commits into from
Mar 20, 2026
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Merged

fix(vite): resolve tsconfig paths in CSS and JS resolvers #19803

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12c1e7e
fix(vite): resolve tsconfig paths in CSS and JS resolvers
nightah Mar 15, 2026
941631b
fix(vite): guard CSS resolver against non-CSS resolutions
nightah Mar 16, 2026
aead317
update changelog
RobinMalfait Mar 20, 2026
acc1847
Merge branch 'main' into fix/vite-resolver-tsconfig-paths
RobinMalfait Mar 20, 2026
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Add support for Vite 8 in `@tailwindcss/vite` ([#19790](https://github.com/tailwindlabs/tailwindcss/pull/19790))
- Improve canonicalization for bare values exceeding default spacing scale suggestions (e.g. `w-1234 h-1234` → `size-1234`) ([#19809](https://github.com/tailwindlabs/tailwindcss/pull/19809))
- Fix canonicalization resulting in empty list (e.g. `w-5 h-5 size-5` → `''` instead of `size-5`) ([#19812](https://github.com/tailwindlabs/tailwindcss/pull/19812))
- Resolve tsconfig paths to allow for `@import '@/path/to/file';` when using `@tailwindcss/vite` ([#19803](https://github.com/tailwindlabs/tailwindcss/pull/19803))

## [4.2.1] - 2026-02-23

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165 changes: 164 additions & 1 deletion integrations/vite/resolvers.test.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,168 @@
import { describe } from 'vitest'
import { candidate, css, fetchStyles, html, js, retryAssertion, test, ts, txt } from '../utils'
import {
candidate,
css,
fetchStyles,
html,
js,
json,
retryAssertion,
test,
ts,
txt,
} from '../utils'

test(
'resolves tsconfig paths in production build',
{
fs: {
'package.json': json`
{
"type": "module",
"dependencies": {
"@tailwindcss/vite": "workspace:^",
"tailwindcss": "workspace:^"
},
"devDependencies": {
"vite": "^8"
}
}
`,
'tsconfig.json': json`
{
"compilerOptions": {
"baseUrl": ".",
"paths": {
"@/*": ["./src/*"]
}
}
}
`,
'vite.config.ts': ts`
import tailwindcss from '@tailwindcss/vite'
import { defineConfig } from 'vite'

export default defineConfig({
build: { cssMinify: false },
plugins: [tailwindcss()],
resolve: {
tsconfigPaths: true,
},
})
`,
'index.html': html`
<head>
<link rel="stylesheet" href="./src/index.css" />
</head>
<body>
<div class="underline custom-underline">Hello, world!</div>
</body>
`,
'src/index.css': css`
@import '@/styles/base.css';
@plugin '@/plugin.js';
`,
'src/styles/base.css': css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
'src/plugin.js': js`
export default function ({ addUtilities }) {
addUtilities({ '.custom-underline': { 'border-bottom': '1px solid green' } })
}
`,
},
},
async ({ fs, exec, expect }) => {
await exec('pnpm vite build')

let files = await fs.glob('dist/**/*.css')
expect(files).toHaveLength(1)
let [filename] = files[0]

await fs.expectFileToContain(filename, [candidate`underline`, candidate`custom-underline`])
},
)

test(
'resolves tsconfig paths in dev mode',
{
fs: {
'package.json': json`
{
"type": "module",
"dependencies": {
"@tailwindcss/vite": "workspace:^",
"tailwindcss": "workspace:^"
},
"devDependencies": {
"vite": "^8"
}
}
`,
'tsconfig.json': json`
{
"compilerOptions": {
"baseUrl": ".",
"paths": {
"@/*": ["./src/*"]
}
}
}
`,
'vite.config.ts': ts`
import tailwindcss from '@tailwindcss/vite'
import { defineConfig } from 'vite'

export default defineConfig({
build: { cssMinify: false },
plugins: [tailwindcss()],
resolve: {
tsconfigPaths: true,
},
})
`,
'index.html': html`
<head>
<link rel="stylesheet" href="./src/index.css" />
</head>
<body>
<div class="underline custom-underline">Hello, world!</div>
</body>
`,
'src/index.css': css`
@import '@/styles/base.css';
@plugin '@/plugin.js';
`,
'src/styles/base.css': css`
@reference 'tailwindcss/theme';
@import 'tailwindcss/utilities';
`,
'src/plugin.js': js`
export default function ({ addUtilities }) {
addUtilities({ '.custom-underline': { 'border-bottom': '1px solid green' } })
}
`,
},
},
async ({ spawn, expect }) => {
let process = await spawn('pnpm vite dev')
await process.onStdout((m) => m.includes('ready in'))

let url = ''
await process.onStdout((m) => {
let match = /Local:\s*(http.*)\//.exec(m)
if (match) url = match[1]
return Boolean(url)
})

await retryAssertion(async () => {
let styles = await fetchStyles(url, '/index.html')
expect(styles).toContain(candidate`underline`)
expect(styles).toContain(candidate`custom-underline`)
})
},
)

describe.each(['postcss', 'lightningcss'])('%s', (transformer) => {
test(
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16 changes: 12 additions & 4 deletions packages/@tailwindcss-vite/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -62,8 +62,12 @@ export default function tailwindcss(opts: PluginOptions = {}): Plugin[] {

let jsResolver = config!.createResolver(config!.resolve)

customCssResolver = (id: string, base: string) => cssResolver(id, base, true, isSSR)
customJsResolver = (id: string, base: string) => jsResolver(id, base, true, isSSR)
customCssResolver = async (id: string, base: string) => {
let resolved = await cssResolver(id, base, false, isSSR)
if (resolved && !resolved.endsWith('.css')) return undefined
return resolved
}
customJsResolver = (id: string, base: string) => jsResolver(id, base, false, isSSR)
} else {
type ResolveIdFn = (
environment: Environment,
Expand Down Expand Up @@ -105,8 +109,12 @@ export default function tailwindcss(opts: PluginOptions = {}): Plugin[] {

let jsResolver = createBackCompatIdResolver(env.config, env.config.resolve)

customCssResolver = (id: string, base: string) => cssResolver(env, id, base, true)
customJsResolver = (id: string, base: string) => jsResolver(env, id, base, true)
customCssResolver = async (id: string, base: string) => {
let resolved = await cssResolver(env, id, base, false)
if (resolved && !resolved.endsWith('.css')) return undefined
return resolved
}
customJsResolver = (id: string, base: string) => jsResolver(env, id, base, false)
}

return new Root(
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