refactor: replace "for...of" with "await Promise.all()"

lib/getConfigGroups.js

@@ -52,24 +52,26 @@ export const getConfigGroups = async ({ configObject, configPath, files }, logge
   // { '.lintstagedrc.json': { config: {...}, files: [...] } }
   const configGroups = {}
 
-  for (const [dir, files] of Object.entries(filesByDir)) {
-    // Discover config from the base directory of the file
-    const { config, filepath } = await loadConfig({ cwd: dir }, logger)
+  await Promise.all(
+    Object.entries(filesByDir).map(([dir, files]) => {
+      // Discover config from the base directory of the file
+      return loadConfig({ cwd: dir }, logger).then(({ config, filepath }) => {
+        if (!config) {
+          logger.error(`${ConfigNotFoundError.message}.`)
+          throw ConfigNotFoundError
+        }
 
-    if (!config) {
-      logger.error(`${ConfigNotFoundError.message}.`)
-      throw ConfigNotFoundError
-    }
+        if (filepath in configGroups) {
+          // Re-use cached config and skip validation
+          configGroups[filepath].files.push(...files)
+          return
+        }
 
-    if (filepath in configGroups) {
-      // Re-use cached config and skip validation
-      configGroups[filepath].files.push(...files)
-      continue
-    }
-
-    const validatedConfig = validateConfig(config, filepath, logger)
-    configGroups[filepath] = { config: validatedConfig, files }
-  }
+        const validatedConfig = validateConfig(config, filepath, logger)
+        configGroups[filepath] = { config: validatedConfig, files }
+      })
+    })
+  )
 
   return configGroups
 }