feat(config/eslintrc): allow devDependencies in all *.config.{js,ts} files

Author: jrolfs

src/config/helpers/build-eslint.js

@@ -0,0 +1,100 @@
+const {rules} = require('eslint-config-airbnb-typescript/lib/shared')
+
+const {hasAnyDep} = require('../../utils')
+const {testMatch} = require('../jest.config')
+
+const withBaseConfig = base => variant =>
+  require.resolve(base + (variant ? `/${variant}` : ''))
+
+const airbnb = withBaseConfig('eslint-config-airbnb-typescript')
+const prettier = withBaseConfig('eslint-config-prettier')
+
+const hasReact = hasAnyDep('react')
+
+const parserRules = (typescript = false, react = false) => {
+  const isOff = off => (off ? 'off' : 'error')
+
+  const propTypes = react ? {'react/prop-types': isOff(typescript)} : {}
+
+  return {
+    'no-implied-eval': isOff(typescript),
+    'no-throw-literal': isOff(typescript),
+    '@typescript-eslint/no-implied-eval': isOff(!typescript),
+    '@typescript-eslint/no-throw-literal': isOff(!typescript),
+    ...propTypes,
+  }
+}
+
+const buildConfig = ({withReact = false} = {}) => {
+  const isReact = withReact || hasReact
+  const ifReact = (t, f) => (isReact ? t : f)
+
+  return {
+    plugins: ['prettier', 'jest', ifReact('react-hooks')].filter(Boolean),
+    extends: [
+      ifReact(airbnb(), airbnb('base')),
+      'plugin:jest/recommended',
+      prettier(),
+      prettier('@typescript-eslint'),
+      ifReact(prettier('react')),
+      ifReact('plugin:react-hooks/recommended'),
+    ].filter(Boolean),
+    rules: {
+      'import/prefer-default-export': 'off',
+      'import/no-extraneous-dependencies': [
+        'error',
+        {
+          devDependencies: rules[
+            'import/no-extraneous-dependencies'
+          ][1].devDependencies.concat([
+            'jest/**',
+            'e2e/**',
+            '**/*.config.{js,ts}',
+          ]),
+          optionalDependencies: false,
+        },
+      ],
+      'import/order': [
+        'error',
+        {
+          alphabetize: {order: 'asc'},
+          'newlines-between': 'always',
+          pathGroups: [
+            {pattern: 'src/**/*', group: 'parent', position: 'before'},
+            {pattern: 'assets/**/*', group: 'parent', position: 'before'},
+          ],
+          pathGroupsExcludedImportTypes: ['builtin'],
+        },
+      ],
+      'no-void': ['error', {allowAsStatement: true}],
+      'prettier/prettier': 'error',
+      'sort-imports': ['error', {ignoreDeclarationSort: true}],
+      ...parserRules(false, isReact),
+    },
+    overrides: [
+      {
+        files: ['**/*.ts?(x)'],
+        extends: [
+          'plugin:@typescript-eslint/recommended-requiring-type-checking',
+        ],
+        rules: {
+          ...parserRules(true, isReact),
+        },
+      },
+      {
+        files: testMatch,
+        rules: {
+          'no-empty': ['error', {allowEmptyCatch: true}],
+        },
+      },
+      {
+        files: ['**/*/__tests__/helpers/**/*', '**/*/__tests__/utils/**/*'],
+        rules: {
+          'jest/no-export': 'off',
+        },
+      },
+    ],
+  }
+}
+
+module.exports = {buildConfig}