[eslint config] [base] [patch] import/no-extraneous-dependencies: add some comments to ignore patterns.

packages/eslint-config-airbnb-base/rules/imports.js

@@ -69,18 +69,18 @@ module.exports = {
     // paths are treated both as absolute paths, and relative to process.cwd()
     'import/no-extraneous-dependencies': ['error', {
       devDependencies: [
-        'spec/**',
-        'test/**',
-        'tests/**',
-        '**/__tests__/**',
-        'test.js',
-        'test-*.js',
-        '**/*.test.js',
-        '**/webpack.config.js',
-        '**/webpack.config.*.js',
-        '**/rollup.config.js',
-        '**/gulpfile.js',
-        '**/Gruntfile',
+        'test/**', // tape, common npm pattern
+        'tests/**', // also common npm pattern
+        'spec/**', // mocha, rspec-like pattern
+        '**/__tests__/**', // jest pattern
+        'test.js', // repos with a single test file
+        'test-*.js', // repos with multiple top-level test files
+        '**/*.test.js', // tests where the extension denotes that it is a test
+        '**/webpack.config.js', // webpack config
+        '**/webpack.config.*.js', // webpack config
+        '**/rollup.config.js', // rollup config
+        '**/gulpfile.js', // gulp config
+        '**/Gruntfile', // grunt config
       ],
       optionalDependencies: false,
     }],