eslint.config.mjs

// @ts-check

import {fixupPluginRules} from '@eslint/compat'
import {FlatCompat} from '@eslint/eslintrc'
import jsEslint from '@eslint/js'
import eslintConfigPrettier from 'eslint-config-prettier'
import tsEslint from 'typescript-eslint'

const compat = new FlatCompat({
  baseDirectory: import.meta.dirname,
  recommendedConfig: jsEslint.configs.recommended,
  allConfig: jsEslint.configs.all
})

/* eslint-disable @typescript-eslint/explicit-function-return-type */
/**
 * @param {string} name the pugin name
 * @param {string} alias the plugin alias
 * @returns {import("eslint").ESLint.Plugin}
 */
function legacyPlugin(name, alias = name) {
  const plugin = compat.plugins(name)[0]?.plugins?.[alias]

  if (!plugin) {
    throw new Error(`Unable to resolve plugin ${name} and/or alias ${alias}`)
  }

  return fixupPluginRules(plugin)
}
/* eslint-enable @typescript-eslint/explicit-function-return-type */

export default tsEslint.config(
  jsEslint.configs.recommended,
  ...tsEslint.configs.strictTypeChecked,
  ...tsEslint.configs.stylisticTypeChecked,
  {
    languageOptions: {
      parserOptions: {
        projectService: {
          allowDefaultProject: ['*.js', '*.mjs']
        },
        tsconfigRootDir: import.meta.dirname
      }
    }
  },
  {
    ignores: ['**/coverage', '**/dist', '**/esbuild.config.mjs']
  },
  {
    plugins: {
      github: legacyPlugin('eslint-plugin-github', 'github'), // pending https://github.com/github/eslint-plugin-github/issues/513
      import: legacyPlugin('eslint-plugin-import', 'import') // Needed for above
    },
    rules: {
      '@typescript-eslint/await-thenable': 'warn',
      '@typescript-eslint/explicit-function-return-type': 'warn',
      '@typescript-eslint/no-explicit-any': 'off',
      '@typescript-eslint/no-floating-promises': ['warn', {ignoreIIFE: true, ignoreVoid: false}],
      '@typescript-eslint/no-shadow': 'error',
      '@typescript-eslint/no-unused-vars': ['warn', {argsIgnorePattern: '^_'}],
      '@typescript-eslint/restrict-template-expressions': [
        'error',
        {
          allowNever: true,
          allowNumber: true
        }
      ],
      'github/array-foreach': 'error',
      'github/no-implicit-buggy-globals': 'error',
      'github/no-then': 'error',
      'github/no-dynamic-script-tag': 'error',
      'import/no-extraneous-dependencies': [
        'error',
        {
          devDependencies: true,
          optionalDependencies: true,
          peerDependencies: true
        }
      ],
      'import/order': ['warn', {'newlines-between': 'always', alphabetize: {order: 'asc'}}],
      'no-console': ['warn']
    }
  },
  {
    files: ['**/*.test.ts'],
    rules: {
      '@typescript-eslint/explicit-function-return-type': 'off',
      '@typescript-eslint/no-non-null-assertion': 'off',
      '@typescript-eslint/no-unsafe-assignment': 'off',
      '@typescript-eslint/no-unsafe-member-access': 'off'
    }
  },
  {
    files: ['**/*.js', '**/*.mjs'],
    ...tsEslint.configs.disableTypeChecked
  },
  eslintConfigPrettier
)