message: config.js -> config.ts
  Fixes
diff: @@ -71,7 +71,7 @@ export let _config: Config = {
  /**
  * Merges initial `options` into WCT's global configuration.
  *
  - * @param {Object} options The options to merge. See `browser/config.js` for a
  + * @param {Object} options The options to merge. See `browser/config.ts` for a
  * reference.
  */
  export function setup(options: Config) {
  