94 lines
2.3 KiB
TypeScript
94 lines
2.3 KiB
TypeScript
import type {$IntentionalAny} from '../../types'
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import Stack from '../../utils/Stack'
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import type {IDerivation} from '../IDerivation'
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function createMechanism() {
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const noop = () => {}
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const stack = new Stack<Collector>()
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const noopCollector: Collector = noop
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type Collector = (d: IDerivation<$IntentionalAny>) => void
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const collectObservedDependencies = (
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cb: () => void,
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collector: Collector,
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) => {
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stack.push(collector)
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cb()
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stack.pop()
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}
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const startIgnoringDependencies = () => {
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stack.push(noopCollector)
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}
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const stopIgnoringDependencies = () => {
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if (stack.peek() !== noopCollector) {
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if (process.env.NODE_ENV === 'development') {
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console.warn('This should never happen')
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}
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} else {
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stack.pop()
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}
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}
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const reportResolutionStart = (d: IDerivation<$IntentionalAny>) => {
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const possibleCollector = stack.peek()
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if (possibleCollector) {
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possibleCollector(d)
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}
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stack.push(noopCollector)
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}
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const reportResolutionEnd = (_d: IDerivation<$IntentionalAny>) => {
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stack.pop()
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}
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const isCollectingDependencies = () => {
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return stack.peek() !== noopCollector
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}
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return {
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type: 'Dataverse_discoveryMechanism' as 'Dataverse_discoveryMechanism',
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collectObservedDependencies,
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startIgnoringDependencies,
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stopIgnoringDependencies,
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reportResolutionStart,
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reportResolutionEnd,
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isCollectingDependencies,
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}
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}
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function getSharedMechanism(): ReturnType<typeof createMechanism> {
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const varName = '__dataverse_discoveryMechanism_sharedStack'
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if (global) {
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const existingMechanism: ReturnType<typeof createMechanism> | undefined =
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// @ts-ignore ignore
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global[varName]
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if (
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existingMechanism &&
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typeof existingMechanism === 'object' &&
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existingMechanism.type === 'Dataverse_discoveryMechanism'
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) {
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return existingMechanism
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} else {
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const mechanism = createMechanism()
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// @ts-ignore ignore
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global[varName] = mechanism
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return mechanism
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}
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} else {
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return createMechanism()
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}
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}
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export const {
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collectObservedDependencies,
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startIgnoringDependencies,
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stopIgnoringDependencies,
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reportResolutionEnd,
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reportResolutionStart,
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isCollectingDependencies,
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} = getSharedMechanism()
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