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/actions/definitions/settings.tsx

@@ -0,0 +1,48 @@
+import { SunIcon, MoonIcon, BrowserIcon } from "outline-icons";
+import * as React from "react";
+import stores from "~/stores";
+import { Theme } from "~/stores/UiStore";
+import { createAction } from "~/actions";
+import { SettingsSection } from "~/actions/sections";
+
+export const changeToDarkTheme = createAction({
+  name: ({ t }) => t("Dark"),
+  icon: <MoonIcon />,
+  iconInContextMenu: false,
+  keywords: "theme dark night",
+  section: SettingsSection,
+  selected: () => stores.ui.theme === "dark",
+  perform: () => stores.ui.setTheme(Theme.Dark),
+});
+
+export const changeToLightTheme = createAction({
+  name: ({ t }) => t("Light"),
+  icon: <SunIcon />,
+  iconInContextMenu: false,
+  keywords: "theme light day",
+  section: SettingsSection,
+  selected: () => stores.ui.theme === "light",
+  perform: () => stores.ui.setTheme(Theme.Light),
+});
+
+export const changeToSystemTheme = createAction({
+  name: ({ t }) => t("System"),
+  icon: <BrowserIcon />,
+  iconInContextMenu: false,
+  keywords: "theme system default",
+  section: SettingsSection,
+  selected: () => stores.ui.theme === "system",
+  perform: () => stores.ui.setTheme(Theme.System),
+});
+
+export const changeTheme = createAction({
+  name: ({ t }) => t("Change theme"),
+  placeholder: ({ t }) => t("Change theme to"),
+  icon: () =>
+    stores.ui.resolvedTheme === "light" ? <SunIcon /> : <MoonIcon />,
+  keywords: "appearance display",
+  section: SettingsSection,
+  children: [changeToLightTheme, changeToDarkTheme, changeToSystemTheme],
+});
+
+export const rootSettingsActions = [changeTheme];