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// An internal module to expose the "waitUntil" API to Edge SSR and Edge Route Handler functions.
// This is highly experimental and subject to change.
// We still need a global key to bypass Webpack's layering of modules.
const GLOBAL_KEY = Symbol.for('__next_internal_waitUntil__')
const state: {
waitUntilCounter: number
waitUntilResolve: () => void
waitUntilPromise: Promise<void> | null
} =
// @ts-ignore
globalThis[GLOBAL_KEY] ||
// @ts-ignore
(globalThis[GLOBAL_KEY] = {
waitUntilCounter: 0,
waitUntilResolve: undefined,
waitUntilPromise: null,
})
// No matter how many concurrent requests are being handled, we want to make sure
// that the final promise is only resolved once all of the waitUntil promises have
// settled.
function resolveOnePromise() {
state.waitUntilCounter--
if (state.waitUntilCounter === 0) {
state.waitUntilResolve()
state.waitUntilPromise = null
}
}
export function internal_getCurrentFunctionWaitUntil() {
return state.waitUntilPromise
}
export function internal_runWithWaitUntil<T>(fn: () => T): T {
const result = fn()
if (
result &&
typeof result === 'object' &&
'then' in result &&
'finally' in result &&
typeof result.then === 'function' &&
typeof result.finally === 'function'
) {
if (!state.waitUntilCounter) {
// Create the promise for the next batch of waitUntil calls.
state.waitUntilPromise = new Promise<void>((resolve) => {
state.waitUntilResolve = resolve
})
}
state.waitUntilCounter++
return result.finally(() => {
resolveOnePromise()
})
}
return result
}
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