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before-after-hook

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before-after-hook

asynchronous before/error/after hooks for internal functionality

  • 3.0.2
  • latest
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  • npm
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What is before-after-hook?

The before-after-hook npm package allows developers to add before, after, and error hooks to JavaScript functions. This is particularly useful for adding custom pre-processing, post-processing, or error handling logic in a clean and organized manner. It can be used in both Node.js and browser environments.

What are before-after-hook's main functionalities?

Creating and using a single hook

This example demonstrates how to create a hook and attach before and after hooks to a function. The before hook logs a message before the main function runs, and the after hook logs a message after the main function completes.

const {Hook} = require('before-after-hook');
const hook = new Hook();

hook.before(addTask, async () => {
  console.log('Before adding task');
});

hook.after(addTask, async () => {
  console.log('After adding task');
});

async function addTask() {
  console.log('Adding task');
}

hook(addTask, []).then(() => {
  console.log('Task added');
});

Error handling with hooks

This example shows how to use the error hook to handle errors that may occur in the main function. The error hook logs the error message, providing a centralized way to handle errors.

const {Hook} = require('before-after-hook');
const hook = new Hook();

hook.error(addTask, async (error) => {
  console.error('Error occurred:', error.message);
});

async function addTask() {
  throw new Error('Failed to add task');
}

hook(addTask, []).catch(err => {
  console.log('Error handling complete.');
});

Wrapping functions with multiple hooks

This example illustrates how to use HookCollection to manage multiple hooks for a single named operation. It demonstrates adding before, after, and error hooks for a 'save' operation, providing a comprehensive example of managing complex asynchronous operations.

const {HookCollection} = require('before-after-hook');
const hooks = new HookCollection();

hooks.before('save', async () => {
  console.log('Before save');
});

hooks.after('save', async () => {
  console.log('After save');
});

hooks.error('save', async (error) => {
  console.error('Error during save:', error.message);
});

async function saveData() {
  console.log('Saving data');
}

hooks('save', saveData, []).then(() => {
  console.log('Data saved');
}).catch(err => {
  console.log('Error handling complete.');
});

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Package last updated on 06 Oct 2022

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