debounce-fn - npm Package Compare versions

Comparing version 3.0.1 to 4.0.0

index.d.ts

@@ -11,13 +11,27 @@ declare namespace debounceFn {
 		/**
-		Trigger the function on the leading edge instead of the trailing edge of the `wait` interval. For example, can be useful for preventing accidental double-clicks on a "submit" button from firing a second time.
+		Trigger the function on the leading edge of the `wait` interval.
 
+		For example, this can be useful for preventing accidental double-clicks on a "submit" button from firing a second time.
+
 		@default false
 		*/
-		readonly immediate?: boolean;
+		readonly before?: boolean;
+
+		/**
+		Trigger the function on the trailing edge of the `wait` interval.
+
+		@default true
+		*/
+		readonly after?: boolean;
 	}
 
-	interface ImmediateOptions extends Options {
-		readonly immediate: true;
+	interface BeforeOptions extends Options {
+		readonly before: true;
 	}
 
+	interface NoBeforeNoAfterOptions extends Options {
+		readonly after: false;
+		readonly before?: false;
+	}
+
 	interface DebouncedFunction<ArgumentsType extends unknown[], ReturnType> {
@@ -48,6 +62,12 @@ (...arguments: ArgumentsType): ReturnType;
 	input: (...arguments: ArgumentsType) => ReturnType,
-	options: debounceFn.ImmediateOptions
+	options: debounceFn.BeforeOptions
 ): debounceFn.DebouncedFunction<ArgumentsType, ReturnType>;
+
 declare function debounceFn<ArgumentsType extends unknown[], ReturnType>(
 	input: (...arguments: ArgumentsType) => ReturnType,
+	options: debounceFn.NoBeforeNoAfterOptions
+): debounceFn.DebouncedFunction<ArgumentsType, undefined>;
+
+declare function debounceFn<ArgumentsType extends unknown[], ReturnType>(
+	input: (...arguments: ArgumentsType) => ReturnType,
 	options?: debounceFn.Options
@@ -54,0 +74,0 @@ ): debounceFn.DebouncedFunction<ArgumentsType, ReturnType | undefined>;

index.js

 'use strict';
 const mimicFn = require('mimic-fn');
 
-module.exports = (fn, options = {}) => {
-	if (typeof fn !== 'function') {
-		throw new TypeError(`Expected the first argument to be a function, got \`${typeof fn}\``);
+module.exports = (inputFunction, options = {}) => {
+	if (typeof inputFunction !== 'function') {
+		throw new TypeError(`Expected the first argument to be a function, got \`${typeof inputFunction}\``);
 	}
 
+	const {
+		wait = 0,
+		before = false,
+		after = true
+	} = options;
+
+	if (!before && !after) {
+		throw new Error('Both `before` and `after` are false, function wouldn\'t be called.');
+	}
+
 	let timeout;
 	let result;
 
-	const debounced = function (...args) {
+	const debouncedFunction = function (...arguments_) {
 		const context = this;
 
 		const later = () => {
-			timeout = null;
-			if (!options.immediate) {
-				result = fn.apply(context, args);
+			timeout = undefined;
+
+			if (after) {
+				result = inputFunction.apply(context, arguments_);
 			}
 		};
 
-		const callNow = options.immediate && !timeout;
+		const shouldCallNow = before && !timeout;
 		clearTimeout(timeout);
-		timeout = setTimeout(later, options.wait || 0);
+		timeout = setTimeout(later, wait);
 
-		if (callNow) {
-			result = fn.apply(context, args);
+		if (shouldCallNow) {
+			result = inputFunction.apply(context, arguments_);
 		}
@@ -33,12 +44,12 @@
 
-	mimicFn(debounced, fn);
+	mimicFn(debouncedFunction, inputFunction);
 
-	debounced.cancel = () => {
+	debouncedFunction.cancel = () => {
 		if (timeout) {
 			clearTimeout(timeout);
-			timeout = null;
+			timeout = undefined;
 		}
 	};
 
-	return debounced;
+	return debouncedFunction;
 };

package.json

 {
 	"name": "debounce-fn",
-	"version": "3.0.1",
+	"version": "4.0.0",
 	"description": "Debounce a function",
 	"license": "MIT",
 	"repository": "sindresorhus/debounce-fn",
+	"funding": "https://github.com/sponsors/sindresorhus",
 	"author": {
 		"name": "Sindre Sorhus",
 		"email": "[e-mail]",
-		"url": "sindresorhus.com"
+		"url": "https://sindresorhus.com"
 	},
 	"engines": {
-		"node": ">=8"
+		"node": ">=10"
 	},
@@ -33,3 +34,3 @@ "scripts": {
 	"dependencies": {
-		"mimic-fn": "^2.1.0"
+		"mimic-fn": "^3.0.0"
 	},
@@ -39,5 +40,5 @@ "devDependencies": {
 		"delay": "^4.2.0",
-		"tsd": "^0.7.2",
-		"xo": "^0.24.0"
+		"tsd": "^0.11.0",
+		"xo": "^0.26.1"
 	}
 }

readme.md

@@ -5,3 +5,2 @@ # debounce-fn [![Build Status](https://travis-ci.org/sindresorhus/debounce-fn.svg?branch=master)](https://travis-ci.org/sindresorhus/debounce-fn)
 
-
 ## Install
@@ -13,3 +12,2 @@
 
-
 ## Usage
@@ -25,6 +23,5 @@
 
-
 ## API
 
-### debounceFn(input, [options])
+### debounceFn(input, options?)
 
@@ -43,7 +40,7 @@ Returns a debounced function that delays calling the `input` function until after `wait` milliseconds have elapsed since the last time the debounced function was called.
 
-Type: `Object`
+Type: `object`
 
 ##### wait
 
-Type: `number`<br>
+Type: `number`\
 Default: `0`
@@ -53,17 +50,20 @@
 
-##### immediate
+##### before
 
-Type: `boolean`<br>
+Type: `boolean`\
 Default: `false`
 
-Trigger the function on the leading edge instead of the trailing edge of the `wait` interval. For example, can be useful for preventing accidental double-clicks on a "submit" button from firing a second time.
+Trigger the function on the leading edge of the `wait` interval.
 
+For example, can be useful for preventing accidental double-clicks on a "submit" button from firing a second time.
 
-## Related
+##### after
 
-- [p-debounce](https://github.com/sindresorhus/p-debounce) - Debounce promise-returning & async functions
+Type: `boolean`\
+Default: `true`
 
+Trigger the function on the trailing edge of the `wait` interval.
 
-## License
+## Related
 
-MIT © [Sindre Sorhus](https://sindresorhus.com)
+- [p-debounce](https://github.com/sindresorhus/p-debounce) - Debounce promise-returning & async functions

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Improved metrics

Total package byte prevSize

6367

increased by14.47%

Lines of code

98

increased by28.95%

Dependency changes

• + Addedmimic-fn@3.1.0(transitive)

• - Removedmimic-fn@2.1.0(transitive)

• Updatedmimic-fn@^3.0.0