fix: limit configuration discovery to cwd

lib/groupFilesByConfig.js

@@ -0,0 +1,53 @@
+import path from 'path'
+
+import debug from 'debug'
+
+import { ConfigObjectSymbol } from './searchConfigs.js'
+
+const debugLog = debug('lint-staged:groupFilesByConfig')
+
+export const groupFilesByConfig = async ({ configs, files }) => {
+  debugLog('Grouping %d files by %d configurations', files.length, Object.keys(configs).length)
+
+  const filesSet = new Set(files)
+  const filesByConfig = {}
+
+  /** Configs are sorted deepest first by `searchConfigs` */
+  for (const filepath of Reflect.ownKeys(configs)) {
+    const config = configs[filepath]
+
+    /** When passed an explicit config object via the Node.js API, skip logic */
+    if (filepath === ConfigObjectSymbol) {
+      filesByConfig[filepath] = { config, files }
+      break
+    }
+
+    const dir = path.normalize(path.dirname(filepath))
+
+    /** Check if file is inside directory of the configuration file */
+    const isInsideDir = (file) => {
+      const relative = path.relative(dir, file)
+      return relative && !relative.startsWith('..') && !path.isAbsolute(relative)
+    }
+
+    const scopedFiles = new Set()
+
+    /**
+     * 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.
+     */
+    filesSet.forEach((file) => {
+      if (isInsideDir(file)) {
+        scopedFiles.add(file)
+      }
+    })
+
+    scopedFiles.forEach((file) => {
+      filesSet.delete(file)
+    })
+
+    filesByConfig[filepath] = { config, files: Array.from(scopedFiles) }
+  }
+
+  return filesByConfig
+}

lib/index.js

@@ -1,9 +1,19 @@
 import debug from 'debug'
 
-import { PREVENTED_EMPTY_COMMIT, GIT_ERROR, RESTORE_STASH_EXAMPLE } from './messages.js'
+import {
+  PREVENTED_EMPTY_COMMIT,
+  GIT_ERROR,
+  RESTORE_STASH_EXAMPLE,
+  NO_CONFIGURATION,
+} from './messages.js'
 import { printTaskOutput } from './printTaskOutput.js'
 import { runAll } from './runAll.js'
-import { ApplyEmptyCommitError, GetBackupStashError, GitError } from './symbols.js'
+import {
+  ApplyEmptyCommitError,
+  ConfigNotFoundError,
+  GetBackupStashError,
+  GitError,
+} from './symbols.js'
 import { validateOptions } from './validateOptions.js'
 
 const debugLog = debug('lint-staged')
@@ -78,7 +88,10 @@ const lintStaged = async (
   } catch (runAllError) {
     if (runAllError && runAllError.ctx && runAllError.ctx.errors) {
       const { ctx } = runAllError
-      if (ctx.errors.has(ApplyEmptyCommitError)) {
+
+      if (ctx.errors.has(ConfigNotFoundError)) {
+        logger.error(NO_CONFIGURATION)
+      } else if (ctx.errors.has(ApplyEmptyCommitError)) {
         logger.warn(PREVENTED_EMPTY_COMMIT)
       } else if (ctx.errors.has(GitError) && !ctx.errors.has(GetBackupStashError)) {
         logger.error(GIT_ERROR)

lib/messages.js

@@ -22,6 +22,8 @@ export const incorrectBraces = (before, after) =>
 `
   )
 
+export const NO_CONFIGURATION = `${error} No valid configuration found.`
+
 export const NO_STAGED_FILES = `${info} No staged files found.`
 
 export const NO_TASKS = `${info} No staged files match any configured task.`

lib/runAll.js

@@ -10,10 +10,10 @@ import normalize from 'normalize-path'
 import { chunkFiles } from './chunkFiles.js'
 import { execGit } from './execGit.js'
 import { generateTasks } from './generateTasks.js'
-import { getConfigGroups } from './getConfigGroups.js'
 import { getRenderer } from './getRenderer.js'
 import { getStagedFiles } from './getStagedFiles.js'
 import { GitWorkflow } from './gitWorkflow.js'
+import { groupFilesByConfig } from './groupFilesByConfig.js'
 import { makeCmdTasks } from './makeCmdTasks.js'
 import {
   DEPRECATED_GIT_ADD,
@@ -36,7 +36,7 @@ import {
   restoreUnstagedChangesSkipped,
 } from './state.js'
 import { GitRepoError, GetStagedFilesError, GitError, ConfigNotFoundError } from './symbols.js'
-import { searchConfigs } from './searchConfigs.js'
+import { ConfigObjectSymbol, searchConfigs } from './searchConfigs.js'
 
 const debugLog = debug('lint-staged:runAll')
 
@@ -120,19 +120,16 @@ export const runAll = async (
     return ctx
   }
 
-  const configGroups = await getConfigGroups({ configObject, configPath, cwd, files }, logger)
-
-  const hasExplicitConfig = configObject || configPath
-  const foundConfigs = hasExplicitConfig ? null : await searchConfigs(gitDir, logger)
-  const numberOfConfigs = hasExplicitConfig ? 1 : Object.keys(foundConfigs).length
+  const foundConfigs = await searchConfigs({ configObject, configPath, cwd, gitDir }, logger)
+  const numberOfConfigs = Reflect.ownKeys(foundConfigs).length
 
   // Throw if no configurations were found
   if (numberOfConfigs === 0) {
     ctx.errors.add(ConfigNotFoundError)
     throw createError(ctx, ConfigNotFoundError)
   }
 
-  debugLog('Found %d configs:\n%O', numberOfConfigs, foundConfigs)
+  const filesByConfig = await groupFilesByConfig({ configs: foundConfigs, files })
 
   const hasMultipleConfigs = numberOfConfigs > 1
 
@@ -152,8 +149,14 @@ export const runAll = async (
   // Set of all staged files that matched a task glob. Values in a set are unique.
   const matchedFiles = new Set()
 
-  for (const [configPath, { config, files }] of Object.entries(configGroups)) {
-    const relativeConfig = normalize(path.relative(cwd, configPath))
+  for (const configPath of Reflect.ownKeys(filesByConfig)) {
+    const { config, files } = filesByConfig[configPath]
+
+    const configName =
+      configPath === ConfigObjectSymbol
+        ? 'Config object'
+        : normalize(path.relative(cwd, configPath))
+
     const stagedFileChunks = chunkFiles({ baseDir: gitDir, files, maxArgLength, relative })
 
     // Use actual cwd if it's specified, or there's only a single config file.
@@ -219,15 +222,15 @@ export const runAll = async (
 
       listrTasks.push({
         title:
-          `${relativeConfig}${dim(` — ${files.length} ${files.length > 1 ? 'files' : 'file'}`)}` +
+          `${configName}${dim(` — ${files.length} ${files.length > 1 ? 'files' : 'file'}`)}` +
           (chunkCount > 1 ? dim(` (chunk ${index + 1}/${chunkCount})...`) : ''),
         task: () => new Listr(chunkListrTasks, { ...listrOptions, concurrent, exitOnError: true }),
         skip: () => {
           // Skip if the first step (backup) failed
           if (ctx.errors.has(GitError)) return SKIPPED_GIT_ERROR
           // Skip chunk when no every task is skipped (due to no matches)
           if (chunkListrTasks.every((task) => task.skip())) {
-            return `${relativeConfig}${dim(' — no tasks to run')}`
+            return `${configName}${dim(' — no tasks to run')}`
           }
           return false
         },

lib/searchConfigs.js

@@ -2,13 +2,16 @@
 
 import { basename, join } from 'path'
 
+import debug from 'debug'
 import normalize from 'normalize-path'
 
 import { execGit } from './execGit.js'
 import { loadConfig, searchPlaces } from './loadConfig.js'
 import { parseGitZOutput } from './parseGitZOutput.js'
 import { validateConfig } from './validateConfig.js'
 
+const debugLog = debug('lint-staged:searchConfigs')
+
 const EXEC_GIT = ['ls-files', '-z', '--full-name']
 
 const filterPossibleConfigFiles = (file) => searchPlaces.includes(basename(file))
@@ -17,14 +20,44 @@ const numberOfLevels = (file) => file.split('/').length
 
 const sortDeepestParth = (a, b) => (numberOfLevels(a) > numberOfLevels(b) ? -1 : 1)
 
+const isInsideDirectory = (dir) => (file) => file.startsWith(normalize(dir))
+
+export const ConfigObjectSymbol = Symbol()
+
 /**
- * Search all config files from the git repository
+ * Search all config files from the git repository, preferring those inside `cwd`.
  *
- * @param {string} gitDir
+ * @param {object} options
+ * @param {Object} [options.configObject] - Explicit config object from the js API
+ * @param {string} [options.configPath] - Explicit path to a config file
+ * @param {string} [options.cwd] - Current working directory
  * @param {Logger} logger
- * @returns {Promise<{ [key: string]: * }>} found configs with filepath as key, and config as value
+ *
+ * @returns {Promise<{ [key: string]: { config: *, files: string[] } }>} found configs with filepath as key, and config as value
  */
-export const searchConfigs = async (gitDir = process.cwd(), logger) => {
+export const searchConfigs = async (
+  { configObject, configPath, cwd = process.cwd(), gitDir = cwd },
+  logger
+) => {
+  debugLog('Searching for configuration files...')
+
+  // Return explicit config object from js API
+  if (configObject) {
+    debugLog('Using single direct configuration object...')
+
+    return { [ConfigObjectSymbol]: validateConfig(configObject, 'config object', logger) }
+  }
+
+  // Use only explicit config path instead of discovering multiple
+  if (configPath) {
+    debugLog('Using single configuration path...')
+
+    const { config, filepath } = await loadConfig({ configPath }, logger)
+
+    if (!config) return {}
+    return { [configPath]: validateConfig(config, filepath, logger) }
+  }
+
   /** Get all possible config files known to git */
   const cachedFiles = parseGitZOutput(await execGit(EXEC_GIT, { cwd: gitDir })).filter(
     filterPossibleConfigFiles
@@ -39,8 +72,11 @@ export const searchConfigs = async (gitDir = process.cwd(), logger) => {
   const possibleConfigFiles = [...cachedFiles, ...otherFiles]
     .map((file) => join(gitDir, file))
     .map((file) => normalize(file))
+    .filter(isInsideDirectory(cwd))
     .sort(sortDeepestParth)
 
+  debugLog('Found possible config files:', possibleConfigFiles)
+
   /** Create object with key as config file, and value as null */
   const configs = possibleConfigFiles.reduce(
     (acc, configPath) => Object.assign(acc, { [configPath]: null }),
@@ -65,5 +101,24 @@ export const searchConfigs = async (gitDir = process.cwd(), logger) => {
     .filter(([, value]) => !!value)
     .reduce((acc, [key, value]) => ({ ...acc, [key]: value }), {})
 
+  /**
+   * Try to find a single config from parent directories
+   * to match old behavior before monorepo support
+   */
+  if (!Object.keys(foundConfigs).length) {
+    debugLog('Could not find config files inside "%s"', cwd)
+
+    const { config, filepath } = await loadConfig({ cwd }, logger)
+    if (config) {
+      debugLog('Found parent configuration file from "%s"', filepath)
+
+      foundConfigs[filepath] = validateConfig(config, filepath, logger)
+    } else {
+      debugLog('Could not find parent configuration files from "%s"', cwd)
+    }
+  }
+
+  debugLog('Found %d config files', Object.keys(foundConfigs).length)
+
   return foundConfigs
 }