code: function verifyPath(packageJson, jsonPath, packagePropertyKey) {
    const isAtRoot = packagePropertyKey === 'module';
    const packageJsonPropPath = path.join(path.dirname(jsonPath), packageJson[packagePropertyKey]);
    let isInvalid = false;
    if (!isAtRoot && packageJsonPropPath.indexOf('dist') === -1) {
      isInvalid = true;
      logError(`${jsonPath} ${packagePropertyKey} property does not reference a file under dist`);
    } else if (isAtRoot && packageJsonPropPath.indexOf('dist') !== -1) {
      isInvalid = true;
      logError(`${jsonPath} ${packagePropertyKey} property should not reference a file under dist`);
    }
    if (!fs.existsSync(packageJsonPropPath)) {
      isInvalid = true;
      logError(`${jsonPath} ${packagePropertyKey} property points to nonexistent ${packageJsonPropPath}`);
    }
  
    if (isInvalid) {
      // Multiple checks could have failed, but only increment the counter once for one package.
  
      switch (packagePropertyKey) {
      case 'main':
        invalidMains++;
        break;
      case 'module':
        invalidModules++;
        break;
      case 'types':
        invalidTypes++;
        break;
      }
    }
  }
docs: Verifies that a file exists at the `packagePropertyKey`. If it does not
  this function will log an error to the console.
  @param {object} packageJson package.json in JSON format
  @param {string} jsonPath filepath (relative to the root directory) to a component's package.json
  @param {string} packagePropertyKey property key of package.json