perf: replace cosmiconfig with lilconfig (#981)

Replace 'cosmiconfig' with 'lilconfig' due to the smaller size and
dependency tree of the latter package. This also installs 'js-yaml',
since 'lilconfig' doesn't provide YAML parsing.

README.md

@@ -105,7 +105,7 @@ Starting with v3.1 you can now use different ways of configuring lint-staged:
 - `lint-staged.config.js`, `.lintstagedrc.js`, or `.lintstagedrc.cjs` file in JS format
 - Pass a configuration file using the `--config` or `-c` flag
 
-See [cosmiconfig](https://github.com/davidtheclark/cosmiconfig) for more details on what formats are supported.
+See [lilconfig](https://github.com/antonk52/lilconfig) for more details on what formats are supported.
 
 Configuration should be an object where each value is a command to run and its key is a glob pattern to use for this command. This package uses [micromatch](https://github.com/micromatch/micromatch) for glob patterns.
 

lib/index.js

@@ -1,6 +1,7 @@
 'use strict'
 
-const { cosmiconfig } = require('cosmiconfig')
+const { lilconfig } = require('lilconfig')
+const { yaml } = require('js-yaml')
 const debugLog = require('debug')('lint-staged')
 const stringifyObject = require('stringify-object')
 
@@ -24,8 +25,10 @@ const resolveConfig = (configPath) => {
   }
 }
 
+const jsYamlLoad = (filepath, content) => yaml.load(content)
+
 const loadConfig = (configPath) => {
-  const explorer = cosmiconfig('lint-staged', {
+  const explorer = lilconfig('lint-staged', {
     searchPlaces: [
       'package.json',
       '.lintstagedrc',
@@ -37,6 +40,11 @@ const loadConfig = (configPath) => {
       'lint-staged.config.js',
       'lint-staged.config.cjs',
     ],
+    loaders: {
+      '.yml': jsYamlLoad,
+      '.yaml': jsYamlLoad,
+      noExt: jsYamlLoad,
+    },
   })
 
   return configPath ? explorer.load(resolveConfig(configPath)) : explorer.search()
@@ -84,7 +92,7 @@ const lintStaged = async (
 ) => {
   await validateOptions({ shell }, logger)
 
-  debugLog('Loading config using `cosmiconfig`')
+  debugLog('Loading config using `lilconfig`')
 
   const resolved = configObject
     ? { config: configObject, filepath: '(input)' }