chore(@formatjs/ts-transformer): fix build

Author: Long Ho

package.json

@@ -92,7 +92,7 @@
     "ts-node": "^8.6.2",
     "ts-pegjs": "^0.2.6",
     "tslib": "^1.11.1",
-    "typescript": "^3.8.3"
+    "typescript": "^3.7.0"
   },
   "eslintConfig": {
     "parser": "@typescript-eslint/parser",

packages/ts-transformer/tests/index.test.ts

@@ -1,8 +1,7 @@
 import {join} from 'path';
 import {Project} from 'ts-morph';
-import {transform, Opts} from '../src';
+import {transform, Opts, MessageDescriptor} from '../src';
 import * as ts from 'typescript';
-import {MessageDescriptor} from '../../eslint-plugin-formatjs/src/util';
 
 const FILES_TO_TESTS: Record<string, Partial<Opts>> = {
   additionalComponentNames: {
@@ -90,7 +89,7 @@ function compile(filePath: string, options?: Partial<Opts>) {
       outDir: join(__dirname, 'output'),
     },
   });
-  project.addExistingSourceFile(filePath);
+  project.addSourceFileAtPathIfExists(filePath);
 
   let msgs: MessageDescriptor[] = [];