// @flow
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opaque type Next = Function | void;
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opaque type Yield = mixed;
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export type Gensync<Args, Return> = {
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(...args: Args): Handler<Return>,
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sync(...args: Args): Return,
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async(...args: Args): Promise<Return>,
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// ...args: [...Args, Callback]
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errback(...args: any[]): void,
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};
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export type Handler<Return> = Generator<Yield, Return, Next>;
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export type Options<Args, Return> = {
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sync(...args: Args): Return,
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arity?: number,
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name?: string,
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} & (
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| { async?: (...args: Args) => Promise<Return> }
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// ...args: [...Args, Callback]
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| { errback(...args: any[]): void }
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);
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declare module.exports: {
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<Args, Return>(
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Options<Args, Return> | ((...args: Args) => Handler<Return>)
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): Gensync<Args, Return>,
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all<Return>(Array<Handler<Return>>): Handler<Return[]>,
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race<Return>(Array<Handler<Return>>): Handler<Return>,
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};
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