fix: remove ESLint 6 specific codes

Author: ylemkimon

README.md

@@ -9,7 +9,7 @@ Lint JS inside GitHub Actions workflow
 
 ## Installation
 
-You'll first need to install [ESLint](http://eslint.org) 6.7 or greater:
+You'll first need to install [ESLint](http://eslint.org) 8 or greater:
 ```
 $ npm i eslint --save-dev
 $ yarn add -D eslint
@@ -31,11 +31,6 @@ Extending the `plugin:actions/recommended` config will enable the processor on a
 }
 ```
 
-With ESLint v7, you can run it as usual. If you're using ESLint v6, you'll need to pass [`--ext` option](https://eslint.org/docs/user-guide/command-line-interface#ext) to include YAML files:
-```
-$ eslint --ext js,yml,yaml .
-```
-
 Currently, only literal blocks (`|`) are supported and it's recommended to use them:
 ```yaml
 # .github/workflows/ci.yml
@@ -54,16 +49,9 @@ The autofixing (`--fix`) is supported, but it's still experimental and whitespac
 ### Advanced Configuration
 
 Dotfiles are ignored by ESLint by default. To lint files inside `.github`, you'll need to add `!.github` to
-`.eslintignore` file or `ignorePatterns` of your configuration file. In ESLint v6, all files having extensions
-specified by `--ext` option are included, so to exclude non-workflow YAML files, add `*.yml`, `*.yaml`, and
-`!/.github/workflows/*.{yml,yaml}`:
+`.eslintignore` file or `ignorePatterns` of your configuration file:
 ```gitignore
 !/.github
-# only for ESLint v6:
-*.yml
-*.yaml
-!/.github/workflows/*.yml
-!/.github/workflows/*.yaml
 ```
 
 Then, add `actions` to the plugins section of your configuration file. You can omit the `eslint-plugin-` prefix:

src/configs/recommended.ts

@@ -2,21 +2,9 @@ import { Linter } from 'eslint';
 
 import { PLUGIN_NAME, WORKFLOW_DIR, WORKFLOW_FILE } from '../util/constants';
 
-const ignorePatterns = [
-  // ignore other YAML files
-  ...WORKFLOW_FILE,
-  // include workflow files, ESLint 6 doesn't do this by default
-  ...WORKFLOW_FILE.map(f => `!/${WORKFLOW_DIR}/${f}`),
-];
-
-// ESLint ignores dotfiles
-if (WORKFLOW_DIR.startsWith('.')) {
-  ignorePatterns.unshift(`!/${WORKFLOW_DIR.split('/')[0]}`);
-}
-
 const recommended: Linter.Config = {
   plugins: [PLUGIN_NAME],
-  ignorePatterns,
+  ignorePatterns: [`!/${WORKFLOW_DIR.split('/')[0]}`],
   overrides: [{
     files: WORKFLOW_FILE.map(f => `${WORKFLOW_DIR}/${f}`),
     processor: `${PLUGIN_NAME}/actions`,

test/package.json

@@ -3,8 +3,8 @@
   "private": true,
   "scripts": {
     "test": "cp test.eslintrc.js .eslintrc.js && yarn test:lint && yarn test:fix && rm .eslintrc.js",
-    "test:lint": "yarn eslint --ext js,yml . | diff -I '^[/$iy].*' fixtures/result.txt -",
-    "test:fix": "cp .github/workflows/test.yml test.yml.bak && yarn eslint --ext js,yml --fix . | diff -I '^[/$iy].*' fixtures/result-fixed.txt - && diff .github/workflows/test.yml .github/workflows-fixed/test.yml && cp test.yml.bak .github/workflows/test.yml"
+    "test:lint": "yarn eslint . | diff -I '^[/$iy].*' fixtures/result.txt -",
+    "test:fix": "cp .github/workflows/test.yml test.yml.bak && yarn eslint --fix . | diff -I '^[/$iy].*' fixtures/result-fixed.txt - && diff .github/workflows/test.yml .github/workflows-fixed/test.yml && cp test.yml.bak .github/workflows/test.yml"
   },
   "devDependencies": {
     "eslint-plugin-actions": "portal:../"