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eslint-disable @typescript-eslint/explicit-function-return-type */\n/* eslint-disable @typescript-eslint/typedef */\n/* eslint-disable @typescript-eslint/explicit-module-boundary-types */\n/* eslint-disable @typescript-eslint/no-explicit-any */\nimport { isThenable } from './is';\n\n/** SyncPromise internal states */\nenum States {\n /** Pending */\n PENDING = 'PENDING',\n /** Resolved / OK */\n RESOLVED = 'RESOLVED',\n /** Rejected / Error */\n REJECTED = 'REJECTED',\n}\n\n/**\n * Thenable class that behaves like a Promise and follows it's interface\n * but is not async internally\n */\nclass SyncPromise<T> implements PromiseLike<T> {\n private _state: States = States.PENDING;\n private _handlers: Array<{\n done: boolean;\n onfulfilled?: ((value: T) => T | PromiseLike<T>) | null;\n onrejected?: ((reason: any) => any) | null;\n }> = [];\n private _value: any;\n\n public constructor(\n executor: (resolve: (value?: T | PromiseLike<T> | null) => void, reject: (reason?: any) => void) => void,\n ) {\n try {\n executor(this._resolve, this._reject);\n } catch (e) {\n this._reject(e);\n }\n }\n\n /** JSDoc */\n public static resolve<T>(value: T | PromiseLike<T>): PromiseLike<T> {\n return new SyncPromise(resolve => {\n resolve(value);\n });\n }\n\n /** JSDoc */\n public static reject<T = never>(reason?: any): PromiseLike<T> {\n return new SyncPromise((_, reject) => {\n reject(reason);\n });\n }\n\n /** JSDoc */\n public static all<U = any>(collection: Array<U | PromiseLike<U>>): PromiseLike<U[]> {\n return new SyncPromise<U[]>((resolve, reject) => {\n if (!Array.isArray(collection)) {\n reject(new TypeError(`Promise.all requires an array as input.`));\n return;\n }\n\n if (collection.length === 0) {\n resolve([]);\n return;\n }\n\n let counter = collection.length;\n const resolvedCollection: U[] = [];\n\n collection.forEach((item, index) => {\n void SyncPromise.resolve(item)\n .then(value => {\n resolvedCollection[index] = value;\n counter -= 1;\n\n if (counter !== 0) {\n return;\n }\n resolve(resolvedCollection);\n })\n .then(null, reject);\n });\n });\n }\n\n /** JSDoc */\n public then<TResult1 = T, TResult2 = never>(\n onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | null,\n onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | null,\n ): PromiseLike<TResult1 | TResult2> {\n return new SyncPromise((resolve, reject) => {\n this._attachHandler({\n done: false,\n onfulfilled: result => {\n if (!onfulfilled) {\n // TODO: ¯\\_(ツ)_/¯\n // TODO: FIXME\n resolve(result as any);\n return;\n }\n try {\n resolve(onfulfilled(result));\n return;\n } catch (e) {\n reject(e);\n return;\n }\n },\n onrejected: reason => {\n if (!onrejected) {\n reject(reason);\n return;\n }\n try {\n resolve(onrejected(reason));\n return;\n } catch (e) {\n reject(e);\n return;\n }\n },\n });\n });\n }\n\n /** JSDoc */\n public catch<TResult = never>(\n onrejected?: ((reason: any) => TResult | PromiseLike<TResult>) | null,\n ): PromiseLike<T | TResult> {\n return this.then(val => val, onrejected);\n }\n\n /** JSDoc */\n public finally<TResult>(onfinally?: (() => void) | null): PromiseLike<TResult> {\n return new SyncPromise<TResult>((resolve, reject) => {\n let val: TResult | any;\n let isRejected: boolean;\n\n return this.then(\n value => {\n isRejected = false;\n val = value;\n if (onfinally) {\n onfinally();\n }\n },\n reason => {\n isRejected = true;\n val = reason;\n if (onfinally) {\n onfinally();\n }\n },\n ).then(() => {\n if (isRejected) {\n reject(val);\n return;\n }\n\n resolve((val as unknown) as any);\n });\n });\n }\n\n /** JSDoc */\n public toString(): string {\n return '[object SyncPromise]';\n }\n\n /** JSDoc */\n private readonly _resolve = (value?: T | PromiseLike<T> | null) => {\n this._setResult(States.RESOLVED, value);\n };\n\n /** JSDoc */\n private readonly _reject = (reason?: any) => {\n this._setResult(States.REJECTED, reason);\n };\n\n /** JSDoc */\n private readonly _setResult = (state: States, value?: T | PromiseLike<T> | any) => {\n if (this._state !== States.PENDING) {\n return;\n }\n\n if (isThenable(value)) {\n void (value as PromiseLike<T>).then(this._resolve, this._reject);\n return;\n }\n\n this._state = state;\n this._value = value;\n\n this._executeHandlers();\n };\n\n // TODO: FIXME\n /** JSDoc */\n private readonly _attachHandler = (handler: {\n /** JSDoc */\n done: boolean;\n /** JSDoc */\n onfulfilled?(value: T): any;\n /** JSDoc */\n onrejected?(reason: any): any;\n }) => {\n this._handlers = this._handlers.concat(handler);\n this._executeHandlers();\n };\n\n /** JSDoc */\n private readonly _executeHandlers = () => {\n if (this._state === States.PENDING) {\n return;\n }\n\n const cachedHandlers = this._handlers.slice();\n this._handlers = [];\n\n cachedHandlers.forEach(handler => {\n if (handler.done) {\n return;\n }\n\n if (this._state === States.RESOLVED) {\n if (handler.onfulfilled) {\n // eslint-disable-next-line @typescript-eslint/no-floating-promises\n handler.onfulfilled((this._value as unknown) as any);\n }\n }\n\n if (this._state === States.REJECTED) {\n if (handler.onrejected) {\n handler.onrejected(this._value);\n }\n }\n\n handler.done = true;\n });\n };\n}\n\nexport { SyncPromise };\n"]} |