Implement register-package and export some packages

Exported packages are:
* anki/packages
* anki/shortcuts
* anki/bridgecommand

ts/editor/index.ts

@@ -7,6 +7,7 @@
  */
 
 import "sveltelib/export-runtime";
+import "lib/register-package";
 
 import { filterHTML } from "html-filter";
 import { updateActiveButtons } from "./toolbar";

ts/lib/bridgecommand.ts

@@ -1,6 +1,8 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
+import { registerPackage } from "./register-package";
+
 declare global {
     interface Window {
         bridgeCommand<T>(command: string, callback?: (value: T) => void): void;
@@ -15,3 +17,7 @@ export function bridgeLink(command: string, label: string): string {
 export function bridgeCommand<T>(command: string, callback?: (value: T) => void): void {
     window.bridgeCommand<T>(command, callback);
 }
+
+registerPackage("anki/bridgecommand", {
+    bridgeCommand,
+});

ts/lib/register-package.ts

@@ -0,0 +1,52 @@
+// Copyright: Ankitects Pty Ltd and contributors
+// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
+import { runtimeLibraries } from "./runtime-require";
+
+export function registerPackage(
+    name: string,
+    entries: Record<string, unknown>,
+    deprecation?: Record<string, string>
+): void {
+    const pack = deprecation
+        ? new Proxy(entries, {
+              get: (target, name: string) => {
+                  if (name in deprecation) {
+                      console.log(`anki: ${name} is deprecated: ${deprecation[name]}`);
+                  }
+
+                  return target[name];
+              },
+          })
+        : entries;
+
+    runtimeLibraries[name] = pack;
+}
+
+function listPackages(): string[] {
+    return Object.keys(runtimeLibraries);
+}
+
+function hasPackages(...names: string[]): boolean {
+    const libraries = listPackages();
+    return names.reduce(
+        (accu: boolean, name: string) => accu && libraries.includes(name),
+        true
+    );
+}
+
+function immediatelyDeprecated() {
+    return false;
+}
+
+registerPackage(
+    "anki/packages",
+    {
+        listPackages,
+        hasPackages,
+        immediatelyDeprecated,
+    },
+    {
+        [immediatelyDeprecated.name]: "Do not use this function",
+    }
+);

ts/lib/shortcuts.ts

@@ -3,6 +3,7 @@
 
 import * as tr from "./i18n";
 import { isApplePlatform } from "./platform";
+import { registerPackage } from "./register-package";
 
 export type Modifier = "Control" | "Alt" | "Shift" | "Meta";
 
@@ -183,3 +184,8 @@ export function registerShortcut(
     document.addEventListener("keydown", handler);
     return (): void => document.removeEventListener("keydown", handler);
 }
+
+registerPackage("anki/shortcuts", {
+    registerShortcut,
+    getPlatformString,
+});