Perf: worker farm

Build/lib/build.worker.ts

@@ -0,0 +1,13 @@
+/**
+ * The single worker module behind the build's shared thread farm. Every job that
+ * runs off the main thread is exported from here; each is implemented in its own
+ * module, this file is only the surface jest-worker loads.
+ *
+ * jest-worker runs one call at a time per thread, so the farm size is chosen for
+ * the phase with the most concurrent calls (see build-worker-farm.ts).
+ */
+export { writeOutput } from './rules/output.worker';
+export { getPhishingDomains } from './get-phishing-domains';
+export { getRejectSources } from './get-reject-sources';
+export { buildMicrosoftCdn } from '../build-microsoft-cdn';
+export { buildCdnDownloadConf } from '../build-cdn-download-conf';