7ab16ecccb
This commit changes `WatchSource` signatures into `Readonly<Ref>`s.
It provides two important benefits:
1. Eliminates the possibility of `undefined` states, that's result of
using `WatchSource`s. This previously required additional null checks.
By using `Readonly<Ref>`, the state handling becomes simpler and less
susceptible to null errors.
2. Optimizes performance by using references:
- Avoids the reactive layer of `computed` references when not needed.
- The `watch` syntax, such as `watch(() => ref.value)`, can introduce
side effects. For example, it does not account for `triggerRef` in
scenarios where the value remains unchanged, preventing the watcher
from running (vuejs/core#9579).
21 lines
515 B
TypeScript
21 lines
515 B
TypeScript
import { WatchSource, watch } from 'vue';
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export function waitForValueChange<T>(
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valueWatcher: WatchSource<T>,
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timeoutMs = 2000,
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): Promise<T> {
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return new Promise<T>((resolve, reject) => {
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const unwatch = watch(valueWatcher, (newValue, oldValue) => {
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if (newValue !== oldValue) {
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unwatch();
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resolve(newValue);
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}
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}, { immediate: false });
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setTimeout(() => {
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unwatch();
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reject(new Error('Timeout waiting for value to change.'));
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}, timeoutMs);
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});
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}
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