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1type BundledFn<Args extends readonly unknown[], Res> = (
2 ...args: Args
3) => Promise<Res>
4
5/**
6 * A helper which ensures that multiple calls to an async function
7 * only produces one in-flight request at a time.
8 */
9export function bundleAsync<Args extends readonly unknown[], Res>(
10 fn: BundledFn<Args, Res>,
11): BundledFn<Args, Res> {
12 let promise: Promise<Res> | undefined
13 return async (...args) => {
14 if (promise) {
15 return promise
16 }
17 promise = fn(...args)
18 try {
19 return await promise
20 } finally {
21 promise = undefined
22 }
23 }
24}