[CORL-678] Transition to eslint (#2634)

* chore: setup eslint

* chore: tslint checks with types & check for import order

* chore: complete eslint transition

* fix: tests

* fix: linting after rebase, faster lint for lint-staged

* chore: remove line

* fix: lint rules

* feat: add a11y linter and fix errors

* fix: tests

scripts/watcher/LongRunningExecutor.ts

@@ -17,8 +17,8 @@ export default class LongRunningExecutor implements Executor {
   private cmd: string;
   private args?: ReadonlyArray<string>;
   private process: ChildProcess | null = null;
-  private isRunning: boolean = false;
-  private shouldRestart: boolean = false;
+  private isRunning = false;
+  private shouldRestart = false;
   private restartDebounced: (() => void) & Cancelable;
 
   constructor(cmd: string, opts: LongRunningExecutorOptions = {}) {
@@ -37,11 +37,11 @@ export default class LongRunningExecutor implements Executor {
       shell: !this.args,
     });
 
-    this.process!.on("exit", (code: number) => {
+    this.process.on("exit", (code: number) => {
       this.isRunning = false;
 
       if (code !== 0 && code !== null) {
-        // tslint:disable-next-line: no-console
+        // eslint-disable-next-line no-console
         console.log(chalk.red(`Command exited with ${code}`));
         return;
       }