make node 6 compatible

CHANGELOG.md

@@ -1,3 +1,7 @@
+## v1.0.0-alpha.4
+
+* [make node 6 compatible](https://github.com/Realytics/fork-ts-checker-webpack-plugin/pull/202)
+
 ## v1.0.0-alpha.3
 
 * [replace peerDeps with runtime checks](https://github.com/Realytics/fork-ts-checker-webpack-plugin/pull/201)

README.md

@@ -129,7 +129,7 @@ may be much faster, even compared to multi-threaded compilation.
 
 * **measureCompilationTime** `boolean`:
 If true, the plugin will measure the time spent inside the compilation code. This may be useful to compare modes,
-especially if there are other loaders/plugins involved in the compilation.
+especially if there are other loaders/plugins involved in the compilation. **requires node 8+**
 
 ### Pre-computed consts:      
   * `ForkTsCheckerWebpackPlugin.ONE_CPU` - always use one CPU

package.json

@@ -1,6 +1,6 @@
 {
   "name": "fork-ts-checker-webpack-plugin",
-  "version": "1.0.0-alpha.3",
+  "version": "1.0.0-alpha.4",
   "description": "Runs typescript type checker and linter on separate process.",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",
@@ -38,7 +38,7 @@
     "webpack-plugin"
   ],
   "engines": {
-    "node": ">=8.9.0"
+    "node": ">=6.11.5"
   },
   "author": "Piotr Oleś <piotrek.oles@gmail.com>",
   "contributors": [

src/index.ts

@@ -1,6 +1,5 @@
 import * as path from 'path';
 import * as process from 'process';
-import { performance } from 'perf_hooks';
 import * as childProcess from 'child_process';
 import * as semver from 'semver';
 import chalk, { Chalk } from 'chalk';
@@ -118,6 +117,7 @@ class ForkTsCheckerWebpackPlugin {
   private vue: boolean;
 
   private measureTime: boolean;
+  private performance: any;
   private startAt: number = 0;
   constructor(options?: Partial<Options>) {
     options = options || ({} as Options);
@@ -186,6 +186,10 @@ class ForkTsCheckerWebpackPlugin {
 
     this.vue = options.vue === true; // default false
     this.measureTime = options.measureCompilationTime === true;
+    if (this.measureTime) {
+      // Node 8+ only
+      this.performance = require('perf_hooks').performance;
+    }
   }
 
   private validateVersions() {
@@ -362,7 +366,7 @@ class ForkTsCheckerWebpackPlugin {
 
           try {
             if (this.measureTime) {
-              this.startAt = performance.now();
+              this.startAt = this.performance.now();
             }
             this.service!.send(this.cancellationToken);
           } catch (error) {
@@ -625,7 +629,7 @@ class ForkTsCheckerWebpackPlugin {
 
   private handleServiceMessage(message: Message): void {
     if (this.measureTime) {
-      const delta = performance.now() - this.startAt;
+      const delta = this.performance.now() - this.startAt;
       this.logger.info(`compilation took: ${delta} ms.`);
     }
     if (this.cancellationToken) {

src/tsconfig.json

@@ -7,7 +7,7 @@
     "skipLibCheck": true,
     "suppressImplicitAnyIndexErrors": true,
     "strict": true,
-    "lib": ["es2015", "es2016.array.include", "dom"],
+    "lib": ["es2015", "es2016.array.include"],
     "module": "commonjs",
     "moduleResolution": "node",
     "declaration": true,