chore(deps): replace cosmiconfig with lilconfig

Remove about 22 dependencies according to npm i --production (from 110 to 88 deps)

* reduce node_modules after `yarn install cssnano` in empty project from 14MB to 13MB
* add YAML dep to preserve YAML configuration compatibility
  YAML configuration was only implicitly documented by referring to cosmiconfig,
  but removing it would be a breaking change

packages/cssnano/package.json

@@ -24,7 +24,8 @@
     ],
     "license": "MIT",
     "dependencies": {
-        "cosmiconfig": "^7.0.0",
+        "lilconfig": "^2.0.3",
+        "yaml": "^1.10.2",
         "cssnano-preset-default": "^5.1.3",
         "is-resolvable": "^1.1.0"
     },

packages/cssnano/src/index.js

@@ -1,6 +1,7 @@
 import path from 'path';
 import postcss from 'postcss';
-import { cosmiconfigSync } from 'cosmiconfig';
+import yaml from 'yaml';
+import { lilconfigSync } from 'lilconfig';
 import isResolvable from 'is-resolvable';
 
 const cssnano = 'cssnano';
@@ -59,7 +60,7 @@ function resolvePreset(preset) {
 
 /*
  * cssnano will look for configuration firstly as options passed
- * directly to it, and failing this it will use cosmiconfig to
+ * directly to it, and failing this it will use lilconfig to
  * load an external file.
  */
 
@@ -76,7 +77,12 @@ function resolveConfig(options) {
     configPath = path.resolve(process.cwd(), options.configFile);
   }
 
-  const configExplorer = cosmiconfigSync(cssnano);
+  const configExplorer = lilconfigSync(cssnano, {
+    loaders: {
+      '.yaml': (filepath, content) => yaml.parse(content),
+      '.yml': (filepath, content) => yaml.parse(content),
+    },
+  });
   const config = configPath
     ? configExplorer.load(configPath)
     : configExplorer.search(searchPath);

yarn.lock

@@ -6325,6 +6325,11 @@ libnpmpublish@^4.0.0:
     semver "^7.1.3"
     ssri "^8.0.1"
 
+lilconfig@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/lilconfig/-/lilconfig-2.0.3.tgz#68f3005e921dafbd2a2afb48379986aa6d2579fd"
+  integrity sha512-EHKqr/+ZvdKCifpNrJCKxBTgk5XupZA3y/aCPY9mxfgBzmgh93Mt/WqjjQ38oMxXuvDokaKiM3lAgvSH2sjtHg==
+
 lines-and-columns@^1.1.6:
   version "1.1.6"
   resolved "https://registry.yarnpkg.com/lines-and-columns/-/lines-and-columns-1.1.6.tgz#1c00c743b433cd0a4e80758f7b64a57440d9ff00"
@@ -7942,12 +7947,13 @@ postcss-font-magician@^3.0.0:
     google-fonts-complete "^2.1.1"
 
 postcss-load-config@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/postcss-load-config/-/postcss-load-config-3.0.1.tgz#d214bf9cfec1608ffaf0f4161b3ba20664ab64b9"
-  integrity sha512-/pDHe30UYZUD11IeG8GWx9lNtu1ToyTsZHnyy45B4Mrwr/Kb6NgYl7k753+05CJNKnjbwh4975amoPJ+TEjHNQ==
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/postcss-load-config/-/postcss-load-config-3.1.0.tgz#d39c47091c4aec37f50272373a6a648ef5e97829"
+  integrity sha512-ipM8Ds01ZUophjDTQYSVP70slFSYg3T0/zyfII5vzhN6V57YSxMgG5syXuwi5VtS8wSf3iL30v0uBdoIVx4Q0g==
   dependencies:
-    cosmiconfig "^7.0.0"
     import-cwd "^3.0.0"
+    lilconfig "^2.0.3"
+    yaml "^1.10.2"
 
 postcss-reporter@^1.3.0:
   version "1.4.1"
@@ -10270,7 +10276,7 @@ yallist@^4.0.0:
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-4.0.0.tgz#9bb92790d9c0effec63be73519e11a35019a3a72"
   integrity sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==
 
-yaml@^1.10.0:
+yaml@^1.10.0, yaml@^1.10.2:
   version "1.10.2"
   resolved "https://registry.yarnpkg.com/yaml/-/yaml-1.10.2.tgz#2301c5ffbf12b467de8da2333a459e29e7920e4b"
   integrity sha512-r3vXyErRCYJ7wg28yvBY5VSoAF8ZvlcW9/BwUzEtUsjvX/DKs24dIkuwjtuprwJJHsbyUbLApepYTR1BN4uHrg==