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promise_provider.ts
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promise_provider.ts
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import { MongoInvalidArgumentError } from './error';
/** @internal */
const kPromise = Symbol('promise');
interface PromiseStore {
[kPromise]: PromiseConstructor | null;
}
const store: PromiseStore = {
[kPromise]: null
};
/**
* Global promise store allowing user-provided promises
* @deprecated Setting a custom promise library is deprecated the next major version will use the global Promise constructor only.
* @public
*/
export class PromiseProvider {
/**
* Validates the passed in promise library
* @deprecated Setting a custom promise library is deprecated the next major version will use the global Promise constructor only.
*/
static validate(lib: unknown): lib is PromiseConstructor {
if (typeof lib !== 'function')
throw new MongoInvalidArgumentError(`Promise must be a function, got ${lib}`);
return !!lib;
}
/**
* Sets the promise library
* @deprecated Setting a custom promise library is deprecated the next major version will use the global Promise constructor only.
*/
static set(lib: PromiseConstructor | null): void {
// eslint-disable-next-line no-restricted-syntax
if (lib === null) {
// Check explicitly against null since `.set()` (no args) should fall through to validate
store[kPromise] = null;
return;
}
if (!PromiseProvider.validate(lib)) {
// validate
return;
}
store[kPromise] = lib;
}
/**
* Get the stored promise library, or resolves passed in
* @deprecated Setting a custom promise library is deprecated the next major version will use the global Promise constructor only.
*/
static get(): PromiseConstructor | null {
return store[kPromise];
}
}