fix: restore functionality of parent globs for a single configuration file

Parent globs like `../*.js` were broken when introducing support
for multiple configuration files in version 12.2.0. This is because
lint-staged incorrectly grouped all files inside a single
configuration's base directory to belong to that config, meaning
files can only match a single configuration.

This has now been fixed so that when a configuration has a
parent glob, it will receive all staged files. Currently this means
there can only be a single configuration file containing a parent
glob, because all files will belong to that config.

This aims to restore the previous behaviour, where only a
single configuration file was supported. It shouldn't be necessary
to use parent globs anymore, because they can be replaced by
using multiple configuration files instead.

Author: iiroj

lib/generateTasks.js

@@ -21,9 +21,7 @@ export const generateTasks = ({ config, cwd = process.cwd(), files, relative = f
 
   const relativeFiles = files.map((file) => normalize(path.relative(cwd, file)))
 
-  return Object.entries(config).map(([rawPattern, commands]) => {
-    let pattern = rawPattern
-
+  return Object.entries(config).map(([pattern, commands]) => {
     const isParentDirPattern = pattern.startsWith('../')
 
     // Only worry about children of the CWD unless the pattern explicitly
@@ -40,6 +38,7 @@ export const generateTasks = ({ config, cwd = process.cwd(), files, relative = f
       // match against filenames in every directory. This makes `*.js`
       // match both `test.js` and `subdirectory/test.js`.
       matchBase: !pattern.includes('/'),
+      posixSlashes: true,
       strictBrackets: true,
     })
 

lib/groupFilesByConfig.js

@@ -30,18 +30,24 @@ export const groupFilesByConfig = async ({ configs, files }) => {
       return relative && !relative.startsWith('..') && !path.isAbsolute(relative)
     }
 
-    const scopedFiles = new Set()
+    /** This config should match all files since it has a parent glob */
+    const includeAllFiles = Object.keys(config).some((glob) => glob.startsWith('..'))
+
+    const scopedFiles = new Set(includeAllFiles ? filesSet : undefined)
 
     /**
-     * If file is inside the config file's directory, assign it to that configuration
-     * and remove it from the set. This means only one configuration can match a file.
+     * Without a parent glob, if file is inside the config file's directory,
+     * assign it to that configuration.
      */
-    filesSet.forEach((file) => {
-      if (isInsideDir(file)) {
-        scopedFiles.add(file)
-      }
-    })
+    if (!includeAllFiles) {
+      filesSet.forEach((file) => {
+        if (isInsideDir(file)) {
+          scopedFiles.add(file)
+        }
+      })
+    }
 
+    /** Files should only match a single config */
     scopedFiles.forEach((file) => {
       filesSet.delete(file)
     })

test/integration.test.js

@@ -1217,7 +1217,7 @@ describe('lint-staged', () => {
     await gitCommit({ shell: true, cwd: path.join(cwd, 'deeper') })
 
     // 'file.js' was ignored
-    expect(await readFile('file.js')).toMatch('')
+    expect(await readFile('file.js')).toEqual('')
 
     // 'deeper/file.js' matched 'deeper/.lintstagedrc.json'
     expect(await readFile('deeper/file.js')).toMatch('level-1')
@@ -1229,7 +1229,40 @@ describe('lint-staged', () => {
     expect(await readFile('deeper/even/deeper/file.js')).toMatch('level-2')
 
     // 'a/very/deep/file/path/file.js' was ignored
-    expect(await readFile('a/very/deep/file/path/file.js')).toMatch('')
+    expect(await readFile('a/very/deep/file/path/file.js')).toEqual('')
+  })
+
+  it('should support parent globs', async () => {
+    // Add some empty files
+    await writeFile('file.js', '')
+    await writeFile('deeper/file.js', '')
+    await writeFile('deeper/even/file.js', '')
+    await writeFile('deeper/even/deeper/file.js', '')
+    await writeFile('a/very/deep/file/path/file.js', '')
+
+    // Include single-level parent glob in deeper config
+    await writeFile(
+      'deeper/even/.lintstagedrc.cjs',
+      `module.exports = { '../*.js': (files) => files.map((f) => \`echo level-2 > \${f}\`) }`
+    )
+
+    // Stage all files
+    await execGit(['add', '.'])
+
+    // Run lint-staged with `--shell` so that tasks do their thing
+    // Run in 'deeper/' so that root config is ignored
+    await gitCommit({ shell: true, cwd: path.join(cwd, 'deeper/even') })
+
+    // Two levels above, no match
+    expect(await readFile('file.js')).toEqual('')
+
+    // One level above, match
+    expect(await readFile('deeper/file.js')).toMatch('level-2')
+
+    // Not directly in the above-level, no match
+    expect(await readFile('deeper/even/file.js')).toEqual('')
+    expect(await readFile('deeper/even/deeper/file.js')).toEqual('')
+    expect(await readFile('a/very/deep/file/path/file.js')).toEqual('')
   })
 
   it('should not care about staged file outside current cwd with another staged file', async () => {