Replace projectRoots with projectRoot + watchRoots

Summary:
We use projectRoots to limit crawling of jest-haste-map in large codebases. Since this implies multiple projects roots, it makes it very hard (or impossible) to reliably cache dependency resolutions.

If we can replace this with a single project root and a set of watch roots, we can have relative path resolutions for all dependencies which van be cached.

Reviewed By: rafeca

Differential Revision: D8450498

fbshipit-source-id: 830c21e847c3236e42d5414a8587508cb73864bd

local-cli/bundle/buildBundle.js

@@ -75,7 +75,6 @@ async function buildBundle(
       : defaultProvidesModuleNodeModules;
 
   const terminal = new Terminal(process.stdout);
-
   const server = new Server({
     asyncRequireModulePath: config.getAsyncRequireModulePath(),
     assetExts: defaultAssetExts.concat(assetExts),
@@ -96,7 +95,7 @@ async function buildBundle(
     platforms: defaultPlatforms.concat(platforms),
     postMinifyProcess: config.postMinifyProcess,
     postProcessBundleSourcemap: config.postProcessBundleSourcemap,
-    projectRoots: config.getProjectRoots(),
+    projectRoot: config.getProjectRoot(),
     providesModuleNodeModules: providesModuleNodeModules,
     reporter: new TerminalReporter(terminal),
     resetCache: args.resetCache,
@@ -104,6 +103,7 @@ async function buildBundle(
     sourceExts: sourceExts.concat(defaultSourceExts),
     transformModulePath: transformModulePath,
     watch: false,
+    watchFolders: config.getWatchFolders(),
     workerPath: config.getWorkerPath && config.getWorkerPath(),
   });