Current behavior

Every time node falls with Heap out of memory, the <project>/node_modules/fork-ts-checker-webpack-plugin/lib/service.js is still running, causing memory leak. The more crashes: the more service.js processes causing leak

Expected behavior

Proper shutdown of all running services

Steps to reproduce the issue

• run node --max-old-space-size=256 ./node_modules/.bin/webpack-dev-server on any mid-size webpack+typescript+react project
• wait node Heap out of memory crash
• ps aux | grep fork-ts-checker

Issue reproduction repository

Environment

• fork-ts-checker-webpack-plugin: 4.0.4
• typescript: 3.7.4
• tslint: 5.11.0
• webpack: 4.19.1
• os: linux mint 19.1