Hardhat: call process.exit on SIGINT (#616)

Author: cgewecke

plugins/hardhat.plugin.js

@@ -90,7 +90,7 @@ task("coverage", "Generates a code coverage report for tests")
     api = new API(utils.loadSolcoverJS(config));
 
     // Catch interrupt signals
-    process.on("SIGINT", nomiclabsUtils.finish.bind(null, config, api));
+    process.on("SIGINT", nomiclabsUtils.finish.bind(null, config, api, true));
 
     // Version Info
     ui.report('hardhat-versions', [pkg.version]);

plugins/resources/nomiclabs.utils.js

@@ -192,7 +192,7 @@ function tempCacheDir(config){
  * @param  {SolidityCoverage}  api
  * @return {Promise}
  */
-async function finish(config, api){
+async function finish(config, api, shouldKill){
   const {
     tempContractsDir,
     tempArtifactsDir
@@ -205,6 +205,7 @@ async function finish(config, api){
   shell.config.silent = false;
 
   if (api) await api.finish();
+  if (shouldKill) process.exit(1)
 }
 
 module.exports = {