# all files / lighthouse-core/ core.js

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     /**
     * @license
     * Copyright 2016 Google Inc. All rights reserved.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    'use strict';

    class Core {
      static audit(artifacts, audits) {
        audits = this.expandAudits(audits);

        return Promise.all(audits.map(audit => audit.audit(artifacts)));
      }

      static expandAudits(audits) {
        return audits.map(audit => {
          // If this is already instantiated, don't do anything else.
          Iif (typeof audit !== 'string') {
            return audit;
          }

          try {
            return require(`./audits/${audit}`);
          } catch (requireError) {
            throw new Error(`Unable to locate audit: ${audit}`);
          }
        });
      }

      static filterAudits(audits, whitelist) {
        return audits.filter(a => {
          // If there is no whitelist, assume all.
          if (!whitelist) {
            return true;
          }

          return whitelist.has(a.toLowerCase());
        });
      }
    }

    module.exports = Core;