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{"version":3,"file":"syncpromise.js","sources":["../../src/syncpromise.ts"],"sourcesContent":["/* 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 */\nconst enum States {\n /** Pending */\n PENDING = 0,\n /** Resolved / OK */\n RESOLVED = 1,\n /** Rejected / Error */\n REJECTED = 2,\n}\n\n// Overloads so we can call resolvedSyncPromise without arguments and generic argument\nexport function resolvedSyncPromise(): PromiseLike<void>;\nexport function resolvedSyncPromise<T>(value: T | PromiseLike<T>): PromiseLike<T>;\n\n/**\n * Creates a resolved sync promise.\n *\n * @param value the value to resolve the promise with\n * @returns the resolved sync promise\n */\nexport function resolvedSyncPromise<T>(value?: T | PromiseLike<T>): PromiseLike<T> {\n return new SyncPromise(resolve => {\n resolve(value);\n });\n}\n\n/**\n * Creates a rejected sync promise.\n *\n * @param value the value to reject the promise with\n * @returns the rejected sync promise\n */\nexport function rejectedSyncPromise<T = never>(reason?: any): PromiseLike<T> {\n return new SyncPromise((_, reject) => {\n reject(reason);\n });\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;\n private _handlers: Array<[boolean, (value: T) => void, (reason: any) => any]>;\n private _value: any;\n\n public constructor(\n executor: (resolve: (value?: T | PromiseLike<T> | null) => void, reject: (reason?: any) => void) => void,\n ) {\n this._state = States.PENDING;\n this._handlers = [];\n\n try {\n executor(this._resolve, this._reject);\n } catch (e) {\n this._reject(e);\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._handlers.push([\n false,\n result => {\n if (!onfulfilled) {\n // TODO: ¯\\_(ツ)_/¯\n // TODO: FIXME\n resolve(result as any);\n } else {\n try {\n resolve(onfulfilled(result));\n } catch (e) {\n reject(e);\n }\n }\n },\n reason => {\n if (!onrejected) {\n reject(reason);\n } else {\n try {\n resolve(onrejected(reason));\n } catch (e) {\n reject(e);\n }\n }\n },\n ]);\n this._executeHandlers();\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 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 /** 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[0]) {\n return;\n }\n\n if (this._state === States.RESOLVED) {\n // eslint-disable-next-line @typescript-eslint/no-floating-promises\n handler[1](this._value as unknown as any);\n }\n\n if (this._state === States.REJECTED) {\n handler[2](this._value);\n }\n\n handler[0] = true;\n });\n };\n}\n\nexport { SyncPromise 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