fix(compiler): only exclude test files when initializing compiler (#2062)

Closes #2061

Author: ahnpnl

e2e/__external-repos__/custom-typings/__tests__/index.test.ts

@@ -1,9 +1,13 @@
-import $ from "jquery"
-
 function foo() {
     $.ajax<number>("/foo")
 }
 
-test("foo", () => {
+test('foo', () => {
   expect(2).toBe(2)
 })
+
+test('bar', () => {
+  const terminateReason: TerminatedReason = 'culled'
+
+  expect(terminateReason).toEqual('culled')
+})

e2e/__external-repos__/custom-typings/global.ts

@@ -0,0 +1 @@
+type TerminatedReason = 'culled' | 'died' | 'transferred'

src/compiler/language-service.ts

@@ -75,7 +75,7 @@ export const initializeLanguageServiceInstance = (configs: ConfigSet, logger: Lo
   }
   // Initialize memory cache for typescript compiler
   configs.parsedTsConfig.fileNames
-    .filter((fileName) => fileName.endsWith('.d.ts'))
+    .filter((fileName) => !configs.isTestFile(fileName))
     .forEach((fileName) => {
       memoryCache.files.set(fileName, {
         version: 0,