kibana/packages/kbn-eslint-import-resolver-kibana/lib/get_project_root.js

const { dirname, resolve, parse } = require('path');
const { accessSync, readFileSync } = require('fs');
const debug = require('./debug');

function getConfig(config) {
  const defaults = {
    projectRoot: true,
  };

  if (!config || !config['@elastic/eslint-import-resolver-kibana'])
    return defaults;
  return Object.assign(
    defaults,
    config['@elastic/eslint-import-resolver-kibana']
  );
}

function getRootPackageDir(dirRoot, dir, rootPackageName) {
  if (dirRoot === dir) return null;
  const pkgFile = resolve(dir, 'package.json');

  try {
    accessSync(pkgFile);

    // if rootPackageName is not provided, stop when package.json is found
    if (!rootPackageName) return dir;

    // if rootPackageName is provided, check for match
    const { name, config } = JSON.parse(readFileSync(pkgFile));
    const { projectRoot } = getConfig(config);

    if (projectRoot && name === rootPackageName) return dir;

    // recurse until a matching package.json is found
    return getRootPackageDir(dirRoot, dirname(dir), rootPackageName);
  } catch (e) {
    if (e.code === 'ENOENT')
      return getRootPackageDir(dirRoot, dirname(dir), rootPackageName);
    throw e;
  }
}

module.exports = function getProjectRoot(file, config) {
  const { root, dir } = parse(resolve(file));
  const { rootPackageName } = config;

  const projectRoot = getRootPackageDir(root, dir, rootPackageName);
  if (projectRoot === null) throw new Error('Failed to find plugin root');

  debug(`Resolved project root: ${projectRoot}`);
  return projectRoot;
};