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RobinMalfaitRobinMalfait
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Write to stdout when --output is omitted (#15656)
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‎CHANGELOG.md

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@@ -14,6 +14,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
1414
- Resolve values in functional utilities based on `@theme` options ([#15623](https://github.com/tailwindlabs/tailwindcss/pull/15623))
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- Discard invalid variants such as `data-checked-[selected=1]:*` ([#15629](https://github.com/tailwindlabs/tailwindcss/pull/15629))
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- Ensure `-outline-offset-*` utilities are suggested in IntelliSense ([#15646](https://github.com/tailwindlabs/tailwindcss/pull/15646))
17+
- Write to `stdout` when `--output` is set to `-` or omitted for `@tailwindcss/cli` ([#15656](https://github.com/tailwindlabs/tailwindcss/pull/15656))
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- Write to `stdout` when `--output -` flag is used for `@tailwindcss/cli` ([#15656](https://github.com/tailwindlabs/tailwindcss/pull/15656))
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- _Upgrade (experimental)_: Pretty print `--spacing(…)` to prevent ambiguity ([#15596](https://github.com/tailwindlabs/tailwindcss/pull/15596))
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## [4.0.0-beta.9] - 2025-01-09

‎integrations/cli/index.test.ts

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@@ -95,6 +95,149 @@ describe.each([
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},
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)
9797

98+
test(
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'production build — read input from stdin',
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{
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fs: {
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'package.json': json`{}`,
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'pnpm-workspace.yaml': yaml`
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#
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packages:
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- project-a
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`,
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'project-a/package.json': json`
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{
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"dependencies": {
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"tailwindcss": "workspace:^",
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"@tailwindcss/cli": "workspace:^"
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}
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}
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`,
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'project-a/index.html': html`
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<div
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class="underline 2xl:font-bold hocus:underline inverted:flex *:flex **:flex"
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></div>
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`,
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'project-a/plugin.js': js`
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module.exports = function ({ addVariant }) {
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addVariant('inverted', '@media (inverted-colors: inverted)')
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addVariant('hocus', ['&:focus', '&:hover'])
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}
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`,
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'project-a/tailwind.config.js': js`
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module.exports = {
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content: ['../project-b/src/**/*.js'],
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}
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`,
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'project-a/src/index.js': js`
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const className = "content-['project-a/src/index.js']"
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module.exports = { className }
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`,
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'project-b/src/index.html': html`
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<div class="flex" />
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`,
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'project-b/src/index.js': js`
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const className = "content-['project-b/src/index.js']"
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module.exports = { className }
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`,
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},
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},
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async ({ root, fs, exec }) => {
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await exec(
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`${command} --input - --output dist/out.css`,
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{ cwd: path.join(root, 'project-a') },
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{
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stdin: css`
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@import 'tailwindcss/utilities';
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@config './tailwind.config.js';
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@source '../project-b/src/**/*.html';
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@plugin './plugin.js';
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`,
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},
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)
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await fs.expectFileToContain('project-a/dist/out.css', [
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candidate`underline`,
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candidate`flex`,
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candidate`content-['project-a/src/index.js']`,
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candidate`content-['project-b/src/index.js']`,
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candidate`inverted:flex`,
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candidate`hocus:underline`,
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candidate`*:flex`,
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candidate`**:flex`,
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])
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},
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)
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test(
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'production build — (write to stdout)',
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{
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fs: {
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'package.json': json`{}`,
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'pnpm-workspace.yaml': yaml`
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#
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packages:
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- project-a
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`,
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'project-a/package.json': json`
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{
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"dependencies": {
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"tailwindcss": "workspace:^",
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"@tailwindcss/cli": "workspace:^"
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}
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}
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`,
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'project-a/index.html': html`
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<div
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class="underline 2xl:font-bold hocus:underline inverted:flex *:flex **:flex"
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></div>
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`,
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'project-a/plugin.js': js`
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module.exports = function ({ addVariant }) {
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addVariant('inverted', '@media (inverted-colors: inverted)')
198+
addVariant('hocus', ['&:focus', '&:hover'])
199+
}
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`,
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'project-a/tailwind.config.js': js`
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module.exports = {
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content: ['../project-b/src/**/*.js'],
204+
}
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`,
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'project-a/src/index.css': css`
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@import 'tailwindcss/utilities';
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@config '../tailwind.config.js';
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@source '../../project-b/src/**/*.html';
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@plugin '../plugin.js';
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`,
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'project-a/src/index.js': js`
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const className = "content-['project-a/src/index.js']"
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module.exports = { className }
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`,
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'project-b/src/index.html': html`
217+
<div class="flex" />
218+
`,
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'project-b/src/index.js': js`
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const className = "content-['project-b/src/index.js']"
221+
module.exports = { className }
222+
`,
223+
},
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},
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async ({ root, expect, exec }) => {
226+
let stdout = await exec(`${command} --input src/index.css --output -`, {
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cwd: path.join(root, 'project-a'),
228+
})
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expect(stdout).toContain(candidate`underline`)
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expect(stdout).toContain(candidate`flex`)
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expect(stdout).toContain(candidate`content-['project-a/src/index.js']`)
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expect(stdout).toContain(candidate`content-['project-b/src/index.js']`)
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expect(stdout).toContain(candidate`inverted:flex`)
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expect(stdout).toContain(candidate`hocus:underline`)
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expect(stdout).toContain(candidate`*:flex`)
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expect(stdout).toContain(candidate`**:flex`)
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},
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)
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98241
test(
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'watch mode',
100243
{

‎integrations/utils.ts

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@@ -25,6 +25,7 @@ interface ChildProcessOptions {
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2626
interface ExecOptions {
2727
ignoreStdErr?: boolean
28+
stdin?: string
2829
}
2930

3031
interface TestConfig {
@@ -112,7 +113,7 @@ export function test(
112113
}
113114
if (debug) console.log(`> ${command}`)
114115
return new Promise((resolve, reject) => {
115-
exec(
116+
let child = exec(
116117
command,
117118
{
118119
cwd,
@@ -134,6 +135,10 @@ export function test(
134135
}
135136
},
136137
)
138+
if (execOptions.stdin) {
139+
child.stdin?.write(execOptions.stdin)
140+
child.stdin?.end()
141+
}
137142
})
138143
},
139144
async spawn(command: string, childProcessOptions: ChildProcessOptions = {}) {

‎packages/@tailwindcss-cli/src/commands/build/index.ts

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@@ -32,6 +32,7 @@ export function options() {
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type: 'string',
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description: 'Output file',
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alias: '-o',
35+
default: '-',
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},
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'--watch': {
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type: 'boolean | string',
@@ -72,8 +73,10 @@ export async function handle(args: Result<ReturnType<typeof options>>) {
7273

7374
let base = path.resolve(args['--cwd'])
7475

75-
// Resolve the output as an absolute path.
76-
if (args['--output']) {
76+
// Resolve the output as an absolute path. If the output is a `-`, then we
77+
// don't need to resolve it because this is a flag to indicate that we want to
78+
// use `stdout` instead.
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if (args['--output'] && args['--output'] !== '-') {
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args['--output'] = path.resolve(base, args['--output'])
7881
}
7982

@@ -129,7 +132,7 @@ export async function handle(args: Result<ReturnType<typeof options>>) {
129132

130133
// Write the output
131134
DEBUG && I.start('Write output')
132-
if (args['--output']) {
135+
if (args['--output'] && args['--output'] !== '-') {
133136
await outputFile(args['--output'], output)
134137
} else {
135138
println(output)

‎packages/@tailwindcss-cli/src/index.ts

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@@ -36,7 +36,7 @@ if (command) {
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//
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// - `tailwindcss -o output.css` // should run the build command, not show the help message
3838
// - `tailwindcss > output.css` // should run the build command, not show the help message
39-
if ((process.stdout.isTTY && !flags['--output']) || flags['--help']) {
39+
if ((process.stdout.isTTY && process.argv[2] === undefined) || flags['--help']) {
4040
help({
4141
usage: ['tailwindcss [--input input.css] [--output output.css] [--watch] [options…]'],
4242
options: { ...build.options(), ...sharedOptions },

‎packages/@tailwindcss-cli/src/utils/args.ts

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@@ -67,8 +67,20 @@ export type Result<T extends Arg> = {
6767
}
6868

6969
export function args<const T extends Arg>(options: T, argv = process.argv.slice(2)): Result<T> {
70+
for (let [idx, value] of argv.entries()) {
71+
if (value === '-') {
72+
argv[idx] = '__IO_DEFAULT_VALUE__'
73+
}
74+
}
75+
7076
let parsed = parse(argv)
7177

78+
for (let key in parsed) {
79+
if (parsed[key] === '__IO_DEFAULT_VALUE__') {
80+
parsed[key] = '-'
81+
}
82+
}
83+
7284
let result: { _: string[]; [key: string]: unknown } = {
7385
_: parsed._,
7486
}

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