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import type { AsyncLocalStorage } from 'async_hooks'
const sharedAsyncLocalStorageNotAvailableError = new Error(
'Invariant: AsyncLocalStorage accessed in runtime where it is not available'
)
class FakeAsyncLocalStorage<Store extends {}>
implements AsyncLocalStorage<Store>
{
disable(): void {
throw sharedAsyncLocalStorageNotAvailableError
}
getStore(): Store | undefined {
// This fake implementation of AsyncLocalStorage always returns `undefined`.
return undefined
}
run<R>(): R {
throw sharedAsyncLocalStorageNotAvailableError
}
exit<R>(): R {
throw sharedAsyncLocalStorageNotAvailableError
}
enterWith(): void {
throw sharedAsyncLocalStorageNotAvailableError
}
static bind<T>(fn: T): T {
return fn
}
}
const maybeGlobalAsyncLocalStorage =
typeof globalThis !== 'undefined' && (globalThis as any).AsyncLocalStorage
export function createAsyncLocalStorage<
Store extends {},
>(): AsyncLocalStorage<Store> {
if (maybeGlobalAsyncLocalStorage) {
return new maybeGlobalAsyncLocalStorage()
}
return new FakeAsyncLocalStorage()
}
export function bindSnapshot<T>(fn: T): T {
if (maybeGlobalAsyncLocalStorage) {
return maybeGlobalAsyncLocalStorage.bind(fn)
}
return FakeAsyncLocalStorage.bind(fn)
}
export function createSnapshot(): <R, TArgs extends any[]>(
fn: (...args: TArgs) => R,
...args: TArgs
) => R {
if (maybeGlobalAsyncLocalStorage) {
return maybeGlobalAsyncLocalStorage.snapshot()
}
return function (fn: any, ...args: any[]) {
return fn(...args)
}
}
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