Add designated folder for extensions (#1245)

* add store for mapping extension names to filesystem paths

- add extension mechinism for getting a folder to save files to

- add test to make sure that extensions are being loaded

- skip extension loading test

Signed-off-by: Sebastian Malton <sebastian@malton.name>

integration/helpers/utils.ts

@@ -8,9 +8,8 @@ const AppPaths: Partial<Record<NodeJS.Platform, string>> = {
 
 export function setup(): Application {
   return new Application({
-    // path to electron app
+    path: AppPaths[process.platform], // path to electron app
     args: [],
-    path: AppPaths[process.platform],
     startTimeout: 30000,
     waitTimeout: 60000,
     env: {
@@ -19,9 +18,10 @@ export function setup(): Application {
   });
 }
 
+type AsyncPidGetter = () => Promise<number>;
+
 export async function tearDown(app: Application) {
-  const mpid: any = app.mainProcess.pid;
-  const pid = await mpid();
+  const pid = await (app.mainProcess.pid as any as AsyncPidGetter)();
   await app.stop();
   try {
     process.kill(pid, "SIGKILL");