mirror of https://github.com/renovatebot/renovate
64 lines
1.4 KiB
TypeScript
64 lines
1.4 KiB
TypeScript
export type Handler<T> = (
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parameters: DecoratorParameters<T>,
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) => Promise<unknown>;
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export type Method<T> = (this: T, ...args: any[]) => Promise<any>;
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export type Decorator<T> = <U extends T>(
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target: U,
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key: keyof U,
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descriptor: TypedPropertyDescriptor<Method<T>>,
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) => TypedPropertyDescriptor<Method<T>>;
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export interface DecoratorParameters<T, U extends any[] = any[]> {
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/**
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* Current call arguments.
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*/
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args: U;
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/**
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* A callback to call the decorated method with the current arguments.
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*/
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callback(this: void): unknown;
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/**
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* Current call context.
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*/
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instance: T;
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/**
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* The decorated method name.
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*/
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methodName?: string;
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}
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/**
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* Applies decorating function to intercept decorated method calls.
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* @param fn - The decorating function.
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*/
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export function decorate<T>(fn: Handler<T>): Decorator<T> {
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const result: Decorator<T> = (
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target,
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key,
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descriptor = {
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enumerable: true,
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configurable: true,
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writable: true,
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...Object.getOwnPropertyDescriptor(target, key),
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},
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) => {
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const { value } = descriptor;
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return Object.assign(descriptor, {
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value(this: T, ...args: any[]) {
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return fn({
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args,
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instance: this,
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callback: () => value?.apply(this, args),
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methodName: value?.name,
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});
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},
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});
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};
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return result;
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}
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