jest-log-suppressing-reporter.js

/**
 * A reporter that suppresses logs for passing tests
 *
 * There's no direct way to do this at this point other than a custom reporter. Future
 * changes may give us an option to do this without a custom reporter:
 *
 * https://github.com/facebook/jest/issues/4156
 *
 * ts-jest seems to not have registered TypeScript extension at the point the reporters are
 * registered; this must be JavaScript unless we want to precompile it.
 */

/* eslint flowtype/require-valid-file-annotation: 0, no-console: 0 */

const DefaultReporter = require('jest-cli/build/reporters/default_reporter').default;
const getResultHeader = require('jest-cli/build/reporters/get_result_header').default;

const loglevels = ['debug', 'warn', 'error', 'none'];

class LogSuppressingReporter extends DefaultReporter {
  constructor(globalConfig) {
    super(globalConfig);
  }

  printTestFileHeader(testPath, config, result) {
    if (result.numFailingTests === 0) {
      this.log(getResultHeader(result, this._globalConfig, config));
      return;
    }

    const loglevel = config.globals.__LOGLEVEL__ || 'debug';

    if (result.console) {
      const loglevelIndex = loglevels.indexOf(loglevel);
      result.console = result.console.filter(e => {
        return e.message.startsWith('[jest]') || loglevels.indexOf(e.type) >= loglevelIndex;
      });
    }

    return super.printTestFileHeader(testPath, config, result);
  }
}

module.exports = LogSuppressingReporter;