eslint-webpack-plugin/dist/worker.js

A ESLint plugin for webpack

"use strict";

/** @typedef {import('eslint').ESLint} ESLint */
/** @typedef {import('eslint').ESLint.Options} ESLintOptions */
/** @typedef {import('eslint').ESLint.LintResult} LintResult */
/** @typedef {{new (arg0: ESLintOptions): ESLint; outputFixes: (arg0: LintResult[]) => any;}} ESLintClass */

Object.assign(module.exports, {
  lintFiles,
  setup
});

/** @type {ESLintClass} */
let ESLint;

/** @type {ESLint} */
let eslint;

/** @type {boolean} */
let fix;

/**
 * @typedef {object} setupOptions
 * @property {string=} eslintPath - import path of eslint
 * @property {string=} configType
 * @property {ESLintOptions} eslintOptions - linter options
 *
 * @param {setupOptions} arg0 - setup worker
 */
function setup({
  eslintPath,
  configType,
  eslintOptions
}) {
  fix = !!(eslintOptions && eslintOptions.fix);
  const eslintModule = require(eslintPath || 'eslint');
  if (eslintModule.ESLint && parseFloat(eslintModule.ESLint.version) >= 9) {
    return eslintModule.loadESLint({
      useFlatConfig: configType === 'flat'
    }).then((/** @type {ESLintClass} */classESLint) => {
      ESLint = classESLint;
      eslint = new ESLint(eslintOptions);
      return eslint;
    });
  }
  let FlatESLint;
  if (eslintModule.LegacyESLint) {
    ESLint = eslintModule.LegacyESLint;
    ({
      FlatESLint
    } = eslintModule);
  } else {
    ({
      ESLint
    } = eslintModule);
    if (configType === 'flat') {
      throw new Error("Couldn't find FlatESLint, you might need to set eslintPath to 'eslint/use-at-your-own-risk'");
    }
  }
  if (configType === 'flat') {
    eslint = new FlatESLint(eslintOptions);
  } else {
    eslint = new ESLint(eslintOptions);
  }
  return eslint;
}

/**
 * @param {string | string[]} files
 */
async function lintFiles(files) {
  /** @type {LintResult[]} */
  const result = await eslint.lintFiles(files);
  // if enabled, use eslint autofixing where possible
  if (fix) {
    await ESLint.outputFixes(result);
  }
  return result;
}