29 lines
797 B
TypeScript
29 lines
797 B
TypeScript
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import type Ticker from '../Ticker'
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import type {$IntentionalAny, VoidFn} from '../types'
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import type Tappable from '../utils/Tappable'
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type IDependent = (msgComingFrom: IDerivation<$IntentionalAny>) => void
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export interface IDerivation<V> {
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isDerivation: true
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isHot: boolean
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changes(ticker: Ticker): Tappable<V>
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changesWithoutValues(): Tappable<void>
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keepHot(): VoidFn
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tapImmediate(ticker: Ticker, fn: (cb: V) => void): VoidFn
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addDependent(d: IDependent): void
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removeDependent(d: IDependent): void
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getValue(): V
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map<T>(fn: (v: V) => T): IDerivation<T>
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flatMap<R>(
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fn: (v: V) => R,
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): IDerivation<R extends IDerivation<infer T> ? T : R>
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}
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export function isDerivation(d: any): d is IDerivation<unknown> {
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return d && d.isDerivation && d.isDerivation === true
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}
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