1 files changed, 59 insertions, 0 deletions
diff --git a/src/renderer/runtime/util.ts b/src/renderer/runtime/util.ts
new file mode 100644
index 0000000..5ea0c88
--- /dev/null
+++ b/src/renderer/runtime/util.ts
@@ -0,0 +1,59 @@
+export function recordToMap<T>(r: Record<string, T>): Map<string, T> {
+	const ret = new Map();
+
+	for (const k of Object.keys(r))
+		ret.set(k, r[k]);
+
+	return ret;
+}
+
+export function mapValues<K, V1, V2>(f: (v: V1) => V2, map: Map<K, V1>): Map<K, V2> {
+	const ret: Map<K, V2> = new Map();
+
+	for (const [k, v] of map)
+		ret.set(k, f(v));
+
+	return ret;
+}
+
+export async function mapValuesAsync<K, V1, V2>(f: (v: V1) => Promise<V2>, map: Map<K, V1>): Promise<Map<K, V2>> {
+	const ret: Map<K, V2> = new Map();
+
+	for (const [k, v] of mapValues(f, map))
+		ret.set(k, await v);
+
+	return ret;
+}
+
+export function nextPowerOf2(n: number): number {
+	let i = 1;
+
+	while (i < n)
+		i *= 2;
+
+	return i;
+}
+
+export class Listenable<T extends any[]> {
+	private readonly listeners: Array<(...args: T) => void> = [];
+
+	public addListener(listener: (...args: T) => void): void {
+		this.listeners.push(listener);
+	}
+
+	protected runListeners(...args: T): void {
+		this.listeners.forEach((l) => l(...args));
+	}
+}
+
+export async function getJSON(url: string): Promise<any> {
+	const res = await window.fetch(url);
+	if (res.status < 200 || res.status >= 300)
+		throw new Error(res.statusText);
+
+	return await res.json();
+}
+
+export function nextAnimationFrame(): Promise<DOMHighResTimeStamp> {
+	return new Promise((resolve) => window.requestAnimationFrame(resolve));
+}