src/types/master.ts
/// <reference lib="dom" />
// tslint:disable max-classes-per-file
// Cannot use `compilerOptions.esModuleInterop` and default import syntax
// See <https://github.com/microsoft/TypeScript/issues/28009>
import { Observable } from "observable-fns"
import { ObservablePromise } from "../observable-promise"
import { $errors, $events, $terminate, $worker } from "../symbols"
import { TransferDescriptor } from "../transferable"
interface ObservableLikeSubscription {
unsubscribe(): any
}
interface ObservableLike<T> {
subscribe(onNext: (value: T) => any, onError?: (error: any) => any, onComplete?: () => any): ObservableLikeSubscription
subscribe(listeners: {
next?(value: T): any,
error?(error: any): any,
complete?(): any,
}): ObservableLikeSubscription
}
export type StripAsync<Type> =
Type extends Promise<infer PromiseBaseType>
? PromiseBaseType
: Type extends ObservableLike<infer ObservableBaseType>
? ObservableBaseType
: Type
export type StripTransfer<Type> =
Type extends TransferDescriptor<infer BaseType>
? BaseType
: Type
export type ModuleMethods = { [methodName: string]: (...args: any) => any }
export type ProxyableArgs<Args extends any[]> = Args extends [arg0: infer Arg0, ...rest: infer RestArgs]
? [Arg0 extends Transferable ? Arg0 | TransferDescriptor<Arg0> : Arg0, ...RestArgs]
: Args
export type ProxyableFunction<Args extends any[], ReturnType> =
Args extends []
? () => ObservablePromise<StripTransfer<StripAsync<ReturnType>>>
: (...args: ProxyableArgs<Args>) => ObservablePromise<StripTransfer<StripAsync<ReturnType>>>
export type ModuleProxy<Methods extends ModuleMethods> = {
[method in keyof Methods]: ProxyableFunction<Parameters<Methods[method]>, ReturnType<Methods[method]>>
}
export interface PrivateThreadProps {
[$errors]: Observable<Error>
[$events]: Observable<WorkerEvent>
[$terminate]: () => Promise<void>
[$worker]: Worker
}
export type FunctionThread<Args extends any[] = any[], ReturnType = any> = ProxyableFunction<Args, ReturnType> & PrivateThreadProps
export type ModuleThread<Methods extends ModuleMethods = any> = ModuleProxy<Methods> & PrivateThreadProps
// We have those extra interfaces to keep the general non-specific `Thread` type
// as an interface, so it's displayed concisely in any TypeScript compiler output.
interface AnyFunctionThread extends PrivateThreadProps {
(...args: any[]): ObservablePromise<any>
}
// tslint:disable-next-line no-empty-interface
interface AnyModuleThread extends PrivateThreadProps {
// Not specifying an index signature here as that would make `ModuleThread` incompatible
}
/** Worker thread. Either a `FunctionThread` or a `ModuleThread`. */
export type Thread = AnyFunctionThread | AnyModuleThread
export type TransferList = Transferable[]
/** Worker instance. Either a web worker or a node.js Worker provided by `worker_threads` or `tiny-worker`. */
export interface Worker extends EventTarget {
postMessage(value: any, transferList?: TransferList): void
/** In nodejs 10+ return type is Promise while with tiny-worker and in browser return type is void */
terminate(callback?: (error?: Error, exitCode?: number) => void): void | Promise<number>
}
export interface ThreadsWorkerOptions extends WorkerOptions {
/** Prefix for the path passed to the Worker constructor. Web worker only. */
_baseURL?: string
/** Resource limits passed on to Node worker_threads */
resourceLimits?: {
/** The maximum size of the main heap in MB. */
maxOldGenerationSizeMb?: number
/** The maximum size of a heap space for recently created objects. */
maxYoungGenerationSizeMb?: number
/** The size of a pre-allocated memory range used for generated code. */
codeRangeSizeMb?: number
}
/** Data passed on to node.js worker_threads. */
workerData?: any
/** Whether to apply CORS protection workaround. Defaults to true. */
CORSWorkaround?: boolean
}
/** Worker implementation. Either web worker or a node.js Worker class. */
export declare class WorkerImplementation extends EventTarget implements Worker {
constructor(path: string | URL, options?: ThreadsWorkerOptions)
public postMessage(value: any, transferList?: TransferList): void
public terminate(): void | Promise<number>
}
/** Class to spawn workers from a blob or source string. */
export declare class BlobWorker extends WorkerImplementation {
constructor(blob: Blob, options?: ThreadsWorkerOptions)
public static fromText(source: string, options?: ThreadsWorkerOptions): WorkerImplementation
}
export interface ImplementationExport {
blob: typeof BlobWorker
default: typeof WorkerImplementation
}
/** Event as emitted by worker thread. Subscribe to using `Thread.events(thread)`. */
export enum WorkerEventType {
internalError = "internalError",
message = "message",
termination = "termination"
}
export interface WorkerInternalErrorEvent {
type: WorkerEventType.internalError
error: Error
}
export interface WorkerMessageEvent<Data> {
type: WorkerEventType.message,
data: Data
}
export interface WorkerTerminationEvent {
type: WorkerEventType.termination
}
export type WorkerEvent = WorkerInternalErrorEvent | WorkerMessageEvent<any> | WorkerTerminationEvent