Add Windows CI (#14065)

This PR changes the GitHub action workflow for V4 to start running all
unit tests and build on both Ubuntu (our current default) _and_ Windows.
This is to ensure we catch issues with paths and other Windows-specific
things sooner. It does, however, not replace testing on Windows.

.github/workflows/ci.yml

@@ -11,12 +11,14 @@ permissions:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
-    timeout-minutes: 15
-
     strategy:
+      fail-fast: false
       matrix:
         node-version: [20]
+        runner: [ubuntu-latest, windows-latest]
+
+    runs-on: ${{ matrix.runner }}
+    timeout-minutes: 15
 
     steps:
       - uses: actions/checkout@v3
@@ -61,6 +63,8 @@ jobs:
 
       - name: Lint
         run: pnpm run lint
+        # Only lint on linux to avoind \r\n line ending errors
+        if: matrix.runner == 'ubuntu-latest'
 
       - name: Test
         run: pnpm run test

crates/oxide/tests/auto_content.rs

@@ -1,7 +1,7 @@
 #[cfg(test)]
 mod auto_content {
-    use std::fs;
     use std::process::Command;
+    use std::{fs, path};
 
     use tailwindcss_oxide::*;
     use tempfile::tempdir;
@@ -15,7 +15,8 @@ mod auto_content {
 
         // Create the necessary files
         for (path, contents) in paths_with_content {
-            let path = dir.join(path);
+            // Ensure we use the right path seperator for the current platform
+            let path = dir.join(path.replace("/", path::MAIN_SEPARATOR.to_string().as_str()));
             let parent = path.parent().unwrap();
             if !parent.exists() {
                 fs::create_dir_all(parent).unwrap();
@@ -38,18 +39,25 @@ mod auto_content {
         let mut paths: Vec<_> = result
             .files
             .into_iter()
-            .map(|x| x.replace(&format!("{}/", &base), ""))
+            .map(|x| x.replace(&format!("{}{}", &base, path::MAIN_SEPARATOR), ""))
             .collect();
 
         for glob in result.globs {
-            paths.push(format!("{}/{}", glob.base, glob.glob));
+            paths.push(format!(
+                "{}{}{}",
+                glob.base,
+                path::MAIN_SEPARATOR,
+                glob.glob
+            ));
         }
 
         paths = paths
             .into_iter()
             .map(|x| {
-                let parent_dir = format!("{}/", &base.to_string());
+                let parent_dir = format!("{}{}", &base.to_string(), path::MAIN_SEPARATOR);
                 x.replace(&parent_dir, "")
+                    // Normalize paths to use unix style separators
+                    .replace("\\", "/")
             })
             .collect();
 

packages/@tailwindcss-cli/src/utils/renderer.test.ts

@@ -1,24 +1,31 @@
 import path from 'path'
 import { describe, expect, it } from 'vitest'
 import { relative, wordWrap } from './renderer'
+import { normalizeWindowsSeperators } from './test-helpers'
 
 describe('relative', () => {
   it('should print an absolute path relative to the current working directory', () => {
-    expect(relative(path.resolve('index.css'))).toMatchInlineSnapshot(`"./index.css"`)
+    expect(normalizeWindowsSeperators(relative(path.resolve('index.css')))).toMatchInlineSnapshot(
+      `"./index.css"`,
+    )
   })
 
   it('should prefer the shortest value by default', () => {
     // Shortest between absolute and relative paths
-    expect(relative('index.css')).toMatchInlineSnapshot(`"index.css"`)
+    expect(normalizeWindowsSeperators(relative('index.css'))).toMatchInlineSnapshot(`"index.css"`)
   })
 
   it('should be possible to override the current working directory', () => {
-    expect(relative('../utils/index.css', '..')).toMatchInlineSnapshot(`"./utils/index.css"`)
+    expect(normalizeWindowsSeperators(relative('../utils/index.css', '..'))).toMatchInlineSnapshot(
+      `"./utils/index.css"`,
+    )
   })
 
   it('should be possible to always prefer the relative path', () => {
     expect(
-      relative('index.css', process.cwd(), { preferAbsoluteIfShorter: false }),
+      normalizeWindowsSeperators(
+        relative('index.css', process.cwd(), { preferAbsoluteIfShorter: false }),
+      ),
     ).toMatchInlineSnapshot(`"./index.css"`)
   })
 })

packages/@tailwindcss-cli/src/utils/test-helpers.ts

@@ -0,0 +1,5 @@
+import path from 'node:path'
+
+export function normalizeWindowsSeperators(p: string) {
+  return path.sep === '\\' ? p.replaceAll('\\', '/') : p
+}

packages/@tailwindcss-postcss/src/index.test.ts

@@ -41,7 +41,7 @@ test("`@import 'tailwindcss'` is replaced with the generated CSS", async () => {
   })
   expect(result.messages).toContainEqual({
     type: 'dir-dependency',
-    dir: expect.stringMatching(/example-project\/src$/g),
+    dir: expect.stringMatching(/example-project[\/|\\]src$/g),
     glob: expect.stringMatching(/^\*\*\/\*/g),
     parent: expect.any(String),
     plugin: expect.any(String),

packages/tailwindcss/src/css-parser.bench.ts

@@ -1,8 +1,10 @@
 import { readFileSync } from 'node:fs'
+import { fileURLToPath } from 'node:url'
+
 import { bench } from 'vitest'
 import * as CSS from './css-parser.ts'
 
-const currentFolder = new URL('..', import.meta.url).pathname
+const currentFolder = fileURLToPath(new URL('..', import.meta.url))
 const cssFile = readFileSync(currentFolder + './preflight.css', 'utf-8')
 
 bench('css-parser on preflight.css', () => {