Simplify karma.conf by reusing node_module resolution logic via requi…

…re.resolve (bazel-contrib#278)

third_party/github.com/bazelbuild/rules_typescript/internal/karma/karma.conf.js

@@ -64,50 +64,18 @@ if (!browsers.length) {
   browsers.push(process.env['DISPLAY'] ? 'Chrome': 'ChromeHeadless');
 }
 
-// On Windows, runfiles will not be in the runfiles folder but inteaad
-// there is a MANIFEST file which maps the runfiles for the test
-// to their location on disk. Bazel provides a RUNFILE_MANIFEST_FILE environment
-// variable which is set the location of the MANIFEST file during test execution.
-// If a MANIFEST file is found, we remap the test files to their
-// location on disk using the MANIFEST file.
-let manifest = null;
-if (process.env.RUNFILE_MANIFEST_FILE && fs.existsSync(process.env.RUNFILE_MANIFEST_FILE)) {
-  // MANIFEST file contains the one runfile mapping per line seperated
-  // a space. For example:
-  // rxjs/operators.js /private/var/tmp/.../external/rxjs/operators.js
-  // The file is parsed here into a map of for easy lookup
-  manifest = {};
-  for (l of fs.readFileSync(process.env.RUNFILE_MANIFEST_FILE, 'utf8').split('\n')) {
-    const m = l.split(' ');
-    manifest[m[0]] = m[1];
-  }
-}
-
-function resolveRunfiles(manifest, runfiles) {
-  if (manifest) {
-    runfiles = runfiles.map(f => {
-      const manifestFile = manifest[f];
-      if (!manifestFile) {
-        throw new Error(`File not found in MANIFEST: ${f}`);
-      }
-      return manifestFile;
-    });
-  }
-  return runfiles;
-}
-
-const files = resolveRunfiles(manifest, [
+const files = [
   TMPL_bootstrap_files
   TMPL_user_files
-]);
+].map(f => require.resolve(f));
 
 // static files are added to the files array but
 // configured to not be included so karma-concat-js does
 // not included them in the bundle
-resolveRunfiles(manifest, [
+[
   TMPL_static_files
-]).forEach(f => {
-  files.push({ pattern: f, included: false });
+].forEach(f => {
+  files.push({ pattern: require.resolve(f), included: false });
 });
 
 var requireConfigContent = `