chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

app/stores/ToastsStore.test.ts

@@ -0,0 +1,25 @@
+import stores from ".";
+
+describe("ToastsStore", () => {
+  const store = stores.toasts;
+
+  test("#add should add messages", () => {
+    expect(store.orderedData.length).toBe(0);
+
+    store.showToast("first error");
+    store.showToast("second error");
+    expect(store.orderedData.length).toBe(2);
+  });
+
+  test("#remove should remove messages", () => {
+    store.toasts.clear();
+    const id = store.showToast("first error");
+    store.showToast("second error");
+
+    expect(store.orderedData.length).toBe(2);
+    id && store.hideToast(id);
+
+    expect(store.orderedData.length).toBe(1);
+    expect(store.orderedData[0].message).toBe("second error");
+  });
+});