@oxlint/migrate/dist/bin/oxlint-migrate.mjs

Generates a `.oxlintrc.json` from a existing eslint flat config

#!/usr/bin/env node
import { program } from "commander";
import { getAutodetectedEslintConfigName } from "./autoDetectConfigFile.mjs";
import { existsSync, readFileSync, renameSync, writeFileSync } from "fs";
import main from "../src/index.mjs";
import path from "path";
import packageJson from "../package.json.mjs";
import { pathToFileURL } from "node:url";
const cwd = process.cwd();
program.name("oxlint-migrate").version(packageJson.version).argument("[eslint-config]", "The path to the eslint v9 config file").option(
  "--output-file <file>",
  "The oxlint configuration file where to eslint v9 rules will be written to",
  ".oxlintrc.json"
).option(
  "--merge",
  "Merge eslint configuration with an existing .oxlintrc.json configuration",
  false
).option(
  "--with-nursery",
  "Include oxlint rules which are currently under development",
  false
).action(async (filePath) => {
  const cliOptions = program.opts();
  const oxlintFilePath = path.join(cwd, cliOptions.outputFile);
  if (filePath === void 0) {
    filePath = getAutodetectedEslintConfigName(cwd);
  } else {
    filePath = path.join(cwd, filePath);
  }
  if (filePath === void 0) {
    program.error(`could not autodetect eslint config file`);
  }
  if (filePath.endsWith("json")) {
    program.error(
      `json format is not supported. @oxlint/migrate only supports the eslint flat configuration`
    );
  }
  if (!existsSync(filePath)) {
    program.error(`eslint config file not found: ${filePath}`);
  }
  const eslintConfigs = await import(pathToFileURL(filePath).toString());
  const options = {
    reporter: console.warn,
    merge: !!cliOptions.merge,
    withNursery: !!cliOptions.withNursery
  };
  let config;
  if (options.merge && existsSync(oxlintFilePath)) {
    config = JSON.parse(
      readFileSync(oxlintFilePath, { encoding: "utf8", flag: "r" })
    );
  }
  const oxlintConfig = "default" in eslintConfigs ? await main(eslintConfigs.default, config, options) : await main(eslintConfigs, config, options);
  if (existsSync(oxlintFilePath)) {
    renameSync(oxlintFilePath, `${oxlintFilePath}.bak`);
  }
  writeFileSync(oxlintFilePath, JSON.stringify(oxlintConfig, null, 2));
});
program.parse();