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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | 8x 8x 1x 1x 43x 43x 43x 1x 42x 42x 1x 1x | import { delay } from './delay';
/**
* Function repeats provided call until it returns not null or undefined value.
* If this process exceeds `maxDurationMs` function will throw
* of those function calls.
*
* @param fn - The function to invoke.
* @param maxDurationMs - Max waiting duration
* @example
* const result = await waitUntilDefined(() => document.body.getElementById("#app"))
* @category Utility
* @throws If if fn does not return not nil value in given time frame
*/
export async function waitUntilDefined<T>(
fn: () => T | undefined,
maxDurationMs: number
): Promise<NonNullable<T>> {
const start = Date.now();
return new Promise<NonNullable<T>>(async resolve => {
while (true) {
const diff = Date.now() - start;
Iif (diff > maxDurationMs) {
throw new Error(`Timeout after ${maxDurationMs}`);
}
const v = fn();
if (v == null) {
await delay(1);
continue;
}
resolve(v as NonNullable<T>);
return;
}
});
}
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