fix: replace emit hook with afterCompile

The afterCompile hook should be blocked instead of emit in order to handle correctly noEmitOnErrors property from webpack.config.js

BREAKING CHANGE: The emit hook is replaced with afterCompile hook.

Author: Fatme

src/index.ts

@@ -571,7 +571,7 @@ class ForkTsCheckerWebpackPlugin {
 
     if ('hooks' in this.compiler) {
       // webpack 4+
-      this.compiler.hooks.emit.tapAsync(checkerPluginName, emit);
+      this.compiler.hooks.afterCompile.tapAsync(checkerPluginName, emit);
     } else {
       // webpack 2 / 3
       this.compiler.plugin('emit', emit);