52 lines
1.3 KiB
TypeScript
52 lines
1.3 KiB
TypeScript
export type Action<T extends string = string, TPayload = any> = {
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type: T;
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meta?: Record<string, unknown>;
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payload?: TPayload;
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};
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export type ActionGenerator<
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TType extends string = string,
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TPayloadGen = (...args: any[]) => any,
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> = {
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type: TType;
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} & (TPayloadGen extends (...args: any) => any
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? ReturnType<TPayloadGen> extends void
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? (...args: Parameters<TPayloadGen>) => {
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type: TType;
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}
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: (...args: Parameters<TPayloadGen>) => {
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type: TType;
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payload: ReturnType<TPayloadGen>;
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}
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: (...args: any[]) => { type: TType; payload?: unknown });
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export function action<
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TType extends string,
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TPayload extends (...args: any) => any,
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>(
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type: TType,
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payloadFunction?: TPayload,
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transformer?: Function,
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): ActionGenerator<TType, TPayload> {
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let generator: any = function (...payloadArg:any[]) {
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const result: Action = { type };
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if (payloadFunction) {
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result.payload = payloadFunction(...payloadArg);
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} else {
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if (payloadArg[0] !== undefined) result.payload = payloadArg[0];
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}
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return result;
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};
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if (transformer) {
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const orig = generator;
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generator = (...args: any) => transformer(orig(...args), args);
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}
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generator.type = type;
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return generator;
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}
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