refactor: do not use Symbol in configuration mapping

Author: iiroj

lib/groupFilesByConfig.js

@@ -11,9 +11,7 @@ export const groupFilesByConfig = async ({ configs, files, singleConfigMode }) =
   const filesByConfig = {}
 
   /** Configs are sorted deepest first by `searchConfigs` */
-  for (const filepath of Reflect.ownKeys(configs)) {
-    const config = configs[filepath]
-
+  for (const [filepath, config] of Object.entries(configs)) {
     /** When passed an explicit config object via the Node.js API‚ or an explicit path, skip logic */
     if (singleConfigMode) {
       filesByConfig[filepath] = { config, files }

lib/runAll.js

@@ -36,7 +36,7 @@ import {
   restoreUnstagedChangesSkipped,
 } from './state.js'
 import { GitRepoError, GetStagedFilesError, GitError, ConfigNotFoundError } from './symbols.js'
-import { ConfigObjectSymbol, searchConfigs } from './searchConfigs.js'
+import { searchConfigs } from './searchConfigs.js'
 
 const debugLog = debug('lint-staged:runAll')
 
@@ -125,7 +125,7 @@ export const runAll = async (
   }
 
   const foundConfigs = await searchConfigs({ configObject, configPath, cwd, gitDir }, logger)
-  const numberOfConfigs = Reflect.ownKeys(foundConfigs).length
+  const numberOfConfigs = Object.keys(foundConfigs).length
 
   // Throw if no configurations were found
   if (numberOfConfigs === 0) {
@@ -157,13 +157,8 @@ 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 of Reflect.ownKeys(filesByConfig)) {
-    const { config, files } = filesByConfig[configPath]
-
-    const configName =
-      configPath === ConfigObjectSymbol
-        ? 'Config object'
-        : normalize(path.relative(cwd, configPath))
+  for (const [configPath, { config, files }] of Object.entries(filesByConfig)) {
+    const configName = configPath ? normalize(path.relative(cwd, configPath)) : 'Config object'
 
     const stagedFileChunks = chunkFiles({ baseDir: gitDir, files, maxArgLength, relative })
 

lib/searchConfigs.js

@@ -23,8 +23,6 @@ const sortDeepestParth = (a, b) => (numberOfLevels(a) > numberOfLevels(b) ? -1 :
 
 const isInsideDirectory = (dir) => (file) => file.startsWith(normalize(dir))
 
-export const ConfigObjectSymbol = Symbol()
-
 /**
  * Search all config files from the git repository, preferring those inside `cwd`.
  *
@@ -46,7 +44,7 @@ export const searchConfigs = async (
   if (configObject) {
     debugLog('Using single direct configuration object...')
 
-    return { [ConfigObjectSymbol]: validateConfig(configObject, 'config object', logger) }
+    return { '': validateConfig(configObject, 'config object', logger) }
   }
 
   // Use only explicit config path instead of discovering multiple

test/searchConfigs.spec.js

@@ -4,7 +4,7 @@ import normalize from 'normalize-path'
 
 import { execGit } from '../lib/execGit.js'
 import { loadConfig } from '../lib/loadConfig.js'
-import { ConfigObjectSymbol, searchConfigs } from '../lib/searchConfigs.js'
+import { searchConfigs } from '../lib/searchConfigs.js'
 
 jest.mock('../lib/resolveConfig', () => ({
   /** Unfortunately necessary due to non-ESM tests. */
@@ -47,7 +47,7 @@ describe('searchConfigs', () => {
 
   it('should return config for valid config object', async () => {
     await expect(searchConfigs({ configObject: { '*.js': 'eslint' } })).resolves.toEqual({
-      [ConfigObjectSymbol]: { '*.js': 'eslint' },
+      '': { '*.js': 'eslint' },
     })
   })