41 lines
1.1 KiB
TypeScript
41 lines
1.1 KiB
TypeScript
type CoalescedInvoke<T> = {
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isOrigin: boolean
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value: T
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}
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export type UnwrapPromise<T> = T extends Promise<infer U> ? U : T
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const globalInvokeCache = new Map<string, Promise<CoalescedInvoke<unknown>>>()
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export function withCoalescedInvoke<F extends (...args: any) => any>(
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func: F
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): (
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key: string,
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args: Parameters<F>
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) => Promise<CoalescedInvoke<UnwrapPromise<ReturnType<F>>>> {
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return async function (key: string, args: Parameters<F>) {
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const entry = globalInvokeCache.get(key)
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if (entry) {
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return entry.then((res) => ({
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isOrigin: false,
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value: res.value as UnwrapPromise<ReturnType<F>>,
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}))
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}
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async function __wrapper() {
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return await func.apply(undefined, args)
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}
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const future = __wrapper()
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.then((res) => {
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globalInvokeCache.delete(key)
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return { isOrigin: true, value: res as UnwrapPromise<ReturnType<F>> }
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})
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.catch((err) => {
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globalInvokeCache.delete(key)
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return Promise.reject(err)
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})
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globalInvokeCache.set(key, future)
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return future
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}
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}
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