[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

src/core/common/utils/timeout.ts

@@ -1,4 +1,4 @@
 /** A promisified timeout. */
-export default function timeout(ms: number = 0) {
+export default function timeout(ms = 0) {
   return new Promise(resolve => setTimeout(resolve, ms));
 }