basePath, // base path for files matching patterns

babelConfigPath = './configuration/serverSideBabel.config.js', typescriptConfigPath = './configuration/typescript.config.json', shouldRegisterModulePath = true } = {}) => {

if(shouldRegisterModulePath) registerPluginPathToRequireHook()

let typescriptEslintRecommended = require('@typescript-eslint/eslint-plugin/dist/configs/recommended.json')

let prettierTypescriptEslint = require('eslint-config-prettier/@typescript-eslint')

let prettierConfig = require('./prettier.config.js')

const vscodeBuildInFormater = {

// NOTE: Using VSCode builtin formatter instead

files: ['**.json', '**.jsonc'],

plugins: ['eslint-plugin-json'], // build-in plugins.

env: {

node: true,

},

}

let nodejsFile = {

files: ['**.js'],

// "excludedFiles": "*.test.js",

parser: 'babel-eslint',

parserOptions: {

babelOptions: {

configFile: babelConfigPath,

},

},

plugins: [

'eslint-plugin-babel', // eslint-plugin-babel re-implements (from the base eslint rules) problematic rules so they do not give false positives or negatives

'prettier',

],

rules: {

// add prettier integration

'prettier/prettier': [

'warn',

prettierConfig,

{

usePrettierrc: true,

},

],

},

env: {

node: true,

},

}

let typescriptFile = {

files: ['**.ts'],

// correctly parse typescript with babel parser - https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/typescript-estree/tests/ast-alignment/parse.ts#L16

parser: '@typescript-eslint/parser',

parserOptions: {

ecmaVersion: 2018,

sourceType: 'module',

project: typescriptConfigPath, // Follows the path should be consumed by a function and replaced.

},

plugins: ['@typescript-eslint/eslint-plugin', 'prettier'],

rules: Object.assign(

typescriptEslintRecommended.rules,

// add prettier integration

prettierTypescriptEslint.rules, // Uses eslint-config-prettier to disable ESLint rules from @typescript-eslint/eslint-plugin that would conflict with prettier

// prettier Eslint Recommended are `prettier` plugin and `error` rule // Enables eslint-plugin-prettier and displays prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.

{

'prettier/prettier': 'warn',

},

),

env: {

node: true,

},

}

let overrides = [

// specific different parser according to file extension.

vscodeBuildInFormater,

nodejsFile,

typescriptFile,

]

if(basePath)

for(let config of overrides)

if(config.files) config.files = config.files.map(item => path.join(basePath, item))

let eslintConfig = {

root: true, // prevent lookup for eslint config file.

overrides,

}

// debug in vscode eslint extention (open: VScode OUTPUT > ESLint)

// console.log(`• ESlint config used:`)

// console.log(eslintConfig.overrides)

return eslintConfig

basePath, // base path for files matching patterns

babelConfigPath = './configuration/clientSideBabel.config.js', shouldRegisterModulePath = true

} = {}) => {

if(shouldRegisterModulePath) registerPluginPathToRequireHook({

// important: should add plugins path to require hook, as these are referenced relative to the target project's eslint.config.js file.

additionalNodeModulePath: [path.join(path.dirname(require.resolve('@open-wc/eslint-config/package.json')), 'node_modules')]

})

// // ESLint overrides property supported only 1 nested level (parent-child).

// let overrides = []

// { const vscodeBuildInFormater = {

// // NOTE: Using VSCode builtin formatter instead

// files: ['**.json', '**.jsonc'],

// plugins: ['eslint-plugin-json'], // build-in plugins.

// env: {

// node: true,

// },

// }

// overrides.push(vscodeBuildInFormater)

// }

// {

// /*

// *https://github.com/open-wc/open-wc/blob/master/packages/prettier-config/prettier.config.js

// Apply formatting to JS files

// Apply formatting to HTML inside of html tagged template literals used by lit-html

// Apply formatting to CSS inside of css tagged template literals used by lit-element

// Integration with ESLint to prevent potentially conflicting rules

// */

// let prettierConfig = require('@open-wc/eslint-config') // https://github.com/open-wc/open-wc/ > eslint-config

// /*

// *https://github.com/open-wc/open-wc/blob/master/packages/eslint-config/index.js

// Apply linting to js and html files

// Apply linting for best practices

// Allow dynamic module imports

// Allow imports in test/demos from devDependencies

// Allow underscore dangle

// Do not prefer default exports

// Do not prefer no file extension

// USAGE:

// • require directly and make sure internal plugin names are resolved correctly (./@open-wc/eslint-config/node_modules/<plugins...>), as it will be referenced by the location of the target project's esling config file (<target project>/configuration/eslint.config.js)

// OR

// • use eslint config: (make sure to add node_modules to require path to resolve plugins correctly) https://github.com/open-wc/open-wc/blob/master/packages/eslint-config/package.json

// "@open-wc/eslint-config",

// "eslint-config-prettier"

// */

// let openWebcomponentEslintConfig = require('@open-wc/eslint-config') // https://github.com/open-wc/open-wc/ > eslint-config

// openWebcomponentEslintConfig = Object.assign({

// files: ['**.js', '**.ts'],

// // set babel configuration location.

// parserOptions: {

// babelOptions: {

// configFile: babelConfigPath,

// },

// },

// }, openWebcomponentEslintConfig)

// // add prettier integration

// openWebcomponentEslintConfig.rules['prettier/prettier'] = [

// 'warn',

// prettierConfig,

// {

// usePrettierrc: true,

// },

// ]

// // extract overrides property as only a single level is supported by ESLint.

// let additionalOverride = openWebcomponentEslintConfig.overrides

// // remove `root` & `overrides` option as it is invalid inside overrides and will throw.

// delete openWebcomponentEslintConfig.root

// delete openWebcomponentEslintConfig.overrides

// overrides = [...overrides, openWebcomponentEslintConfig, ...additionalOverride]

// }

// if(basePath)

// for(let config of overrides)

// if(config.files) config.files = config.files.map(item => path.join(basePath, item))

// let eslintConfig = {

// root: true, // prevent lookup for eslint config file.

// overrides,

// }

// // debug in vscode eslint extention (open: VScode OUTPUT > ESLint)

// // console.log(`• ESlint config used:`)

// // console.log(eslintConfig.overrides)

// return eslintConfig

// Temporary until feature is merged (check for link above)

return Object.assign(require('@open-wc/eslint-config'), {parserOptions: {

babelOptions: {

configFile: babelConfigPath,

},

},