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/* eslint-disable @typescript-eslint/no-explicit-any */
import { DebounceType } from './debounceType/debounceType';
/**
* Debounce decorator. Inspired by
* https://stackoverflow.com/questions/44634992/debounce-hostlistener-event.
*
* When a function is decorated with this, it won't be executed excessively
* repeatidly. There are multiple {@link DebounceType} that govern the
* behaviour.
*
* @param delay The acceptable delay between function calls
* @param type The {@link DebounceType}
* @returns The `MethodDecorator`
*/
export function debounce(
delay = 200,
type = DebounceType.PERIODIC
): MethodDecorator {
return (
target: Object,
propertyKey: string | Symbol,
descriptor: PropertyDescriptor
) => {
const original = descriptor.value;
const key = `__timeout__${propertyKey}`;
const keyTimeStarted = key + '__timeStarted';
descriptor[keyTimeStarted as keyof PropertyDescriptor] = false;
descriptor.value = function (...args: unknown[]) {
//https://stackoverflow.com/questions/59034388/jasmine-spying-an-exported-function-that-is-called-by-an-another-function-does
//https://medium.com/@DavideRama/mock-spy-exported-functions-within-a-single-module-in-jest-cdf2b61af642
switch (type) {
case DebounceType.IMMEDIATE:
exportedForTesting.immediate(
this,
key,
keyTimeStarted,
original,
delay,
args
);
break;
case DebounceType.END:
exportedForTesting.end(
this,
key,
keyTimeStarted,
original,
delay,
args
);
break;
case DebounceType.BOTH:
exportedForTesting.both(
this,
key,
keyTimeStarted,
original,
delay,
args
);
break;
case DebounceType.PERIODIC:
exportedForTesting.periodic(
this,
key,
keyTimeStarted,
original,
delay,
args
);
break;
}
};
return descriptor;
};
}
/**
* Method used for {@link DebounceType} immediate behaviour
*
* @param target The instance calling the decorated method
* @param key The key used as a field to track the elpased time
* @param keyTimeStarted The key used as a field to track whether the debouncing
* process has started
* @param original The decorated method
* @param delay The delay
* @param args The method args
*/
function immediate(
target: Object,
key: string,
keyTimeStarted: string,
original: any,
delay: number,
args: unknown[]
) {
if (!(target as any)[keyTimeStarted]) original.apply(target, args);
(target as any)[keyTimeStarted] = true;
clearTimeout((target as any)[key]);
(target as any)[key] = setTimeout(
() => ((target as any)[keyTimeStarted] = false),
delay
);
}
/**
* Method used for {@link DebounceType} end behaviour
*
* @param target The instance calling the decorated method
* @param key The key used as a field to track the elpased time
* @param keyTimeStarted The key used as a field to track whether the debouncing
* process has started
* @param original The decorated method
* @param delay The delay
* @param args The method args
*/
function end(
target: Object,
key: string,
_keyTimeStarted: string,
original: any,
delay: number,
args: unknown[]
) {
clearTimeout((target as any)[key]);
(target as any)[key] = setTimeout(() => original.apply(target, args), delay);
}
/**
* Method used for {@link DebounceType} both behaviour
*
* @param target The instance calling the decorated method
* @param key The key used as a field to track the elpased time
* @param keyTimeStarted The key used as a field to track whether the debouncing
* process has started
* @param original The decorated method
* @param delay The delay
* @param args The method args
*/
function both(
target: Object,
key: string,
keyTimeStarted: string,
original: any,
delay: number,
args: unknown[]
) {
if (!(target as any)[keyTimeStarted]) original.apply(target, args);
(target as any)[keyTimeStarted] = true;
clearTimeout((target as any)[key]);
(target as any)[key] = setTimeout(() => {
(target as any)[keyTimeStarted] = false;
original.apply(target, args);
}, delay);
}
/**
* Method used for {@link DebounceType} periodic behaviour
*
* @param target The instance calling the decorated method
* @param key The key used as a field to track the elpased time
* @param keyTimeStarted The key used as a field to track whether the debouncing
* process has started
* @param original The decorated method
* @param delay The delay
* @param args The method args
*/
function periodic(
target: Object,
key: string,
keyTimeStarted: string,
original: any,
delay: number,
args: unknown[]
) {
if (!(target as any)[keyTimeStarted]) {
original.apply(target, args);
(target as any)[key] = setTimeout(() => {
(target as any)[keyTimeStarted] = false;
original.apply(target, args);
}, delay);
}
(target as any)[keyTimeStarted] = true;
}
/**
* Functions exported for unit testing purposes.
* https://stackoverflow.com/questions/59034388/jasmine-spying-an-exported-function-that-is-called-by-an-another-function-does
* https://medium.com/@DavideRama/mock-spy-exported-functions-within-a-single-module-in-jest-cdf2b61af642
*/
export const exportedForTesting = { immediate, end, both, periodic };
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