From d11ed5afc3fc89b80a47b3e54617c18af24b3043 Mon Sep 17 00:00:00 2001
From: MG <m@sudo.eu>
Date: Sat, 11 Jul 2020 01:28:32 +0200
Subject: [PATCH] fix: building es5 only that supports es2015

closes #158
---
 README.md                      |  2 +-
 lib/mock-module/mock-module.ts | 30 +++++++++++++++++++++++++-----
 package.json                   |  7 ++-----
 tsconfig.json                  |  2 +-
 4 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/README.md b/README.md
index f053eafed7..264da0c1c2 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Tested on:
 - Angular 7 (Jasmine, Jest, es5, es2015)
 - Angular 8 (Jasmine, Jest, es5, es2015)
 - Angular 9 (Jasmine, Jest, Ivy, es5, es2015)
-- Angular 10 (Jasmine, Jest, Ivy, es2015), es5 isn't supported, use `target: es2015` in `tsconfig.spec.json`
+- Angular 10 (Jasmine, Jest, Ivy, es5, es2015)
 
 ## Why use this?
 
diff --git a/lib/mock-module/mock-module.ts b/lib/mock-module/mock-module.ts
index cc89f9450f..8873eaa3b4 100644
--- a/lib/mock-module/mock-module.ts
+++ b/lib/mock-module/mock-module.ts
@@ -15,7 +15,7 @@ import {
   Type,
 } from '../common';
 import { ngMocksUniverse } from '../common/ng-mocks-universe';
-import { ngModuleResolver } from '../common/reflect';
+import { jitReflector, ngModuleResolver } from '../common/reflect';
 import { MockComponent } from '../mock-component';
 import { MockDirective } from '../mock-directive';
 import { MockPipe } from '../mock-pipe';
@@ -130,11 +130,31 @@ export function MockModule(module: any): any {
   if (mockModuleDef) {
     const parent = ngMocksUniverse.flags.has('skipMock') ? ngModule : Mock;
 
-    @NgModule(mockModuleDef)
-    @MockOf(ngModule)
-    class ModuleMock extends parent {}
+    // first we try to eval es2015 style and if it fails to use es5 transpilation in the catch block.
+    (window as any).ngMocksParent = parent;
+    try {
+      // tslint:disable-next-line:no-eval
+      eval(`
+        class mockModule extends window.ngMocksParent {
+        }
+        window.ngMocksResult = mockModule
+      `);
+      mockModule = (window as any).ngMocksResult;
+    } catch (e) {
+      class ClassEs5 extends parent {}
+      mockModule = ClassEs5;
+    }
+    (window as any).ngMocksParent = undefined;
+
+    // the next step is to respect constructor parameters as the parent class.
+    if (mockModule) {
+      (mockModule as any).parameters = jitReflector.parameters(parent);
+    }
+
+    // the last thing is to apply decorators.
+    NgModule(mockModuleDef)(mockModule as any);
+    MockOf(ngModule)(mockModule as any);
 
-    mockModule = ModuleMock;
     if (ngMocksUniverse.flags.has('cacheModule')) {
       ngMocksUniverse.cache.set(ngModule, mockModule);
     }
diff --git a/package.json b/package.json
index 33c355cd7a..f446a369a3 100644
--- a/package.json
+++ b/package.json
@@ -3,9 +3,6 @@
   "version": "10.0.0",
   "description": "Functions for creating angular mocks",
   "main": "dist/index.js",
-  "module": "dist/es5/index.js",
-  "es5": "dist/es5/index.js",
-  "es2015": "dist/index.js",
   "types": "dist/index.d.ts",
   "files": [
     "CHANGELOG",
@@ -14,7 +11,7 @@
     "README"
   ],
   "scripts": {
-    "build": "npm run clean && tsc && tsc -t es5 --outDir dist/es5",
+    "build": "npm run clean && tsc",
     "build:all": "npm run lint && npm run build && npm run test",
     "i:a": "npm run i:a5 & npm run i:a6 & npm run i:a7 & npm run i:a8 & npm run i:a9 & npm run i:a10 & wait",
     "i:a5": "npm run i:a5es5 && npm run i:a5es2015",
@@ -138,7 +135,7 @@
     "test:a9es5noivy": "cd e2e/a9es5noivy && npm run test",
     "test:a9es2015ivy": "cd e2e/a9es2015ivy && npm run test",
     "test:a9es2015noivy": "cd e2e/a9es2015noivy && npm run test",
-    "test:a10": "npm run test:a10es2015",
+    "test:a10": "npm run test:a10es5 && npm run test:a10es2015",
     "test:a10es5": "npm run test:a10es5ivy && npm run test:a10es5noivy",
     "test:a10es2015": "npm run test:a10es2015ivy && npm run test:a10es2015noivy",
     "test:a10es5ivy": "cd e2e/a10es5ivy && npm run test",
diff --git a/tsconfig.json b/tsconfig.json
index 8684cc6d2e..80b35857df 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,7 +2,7 @@
   "compilerOptions": {
     "lib": ["dom", "es7"],
     "module": "commonjs",
-    "target": "es2015",
+    "target": "es5",
     "noImplicitAny": true,
     "moduleResolution": "node",
     "emitDecoratorMetadata": true,