Ampersand.js Callback Creation Utility

1.0.1 verified Thu Apr 23 auth: no javascript abandoned

The `amp-create-callback` package is a minimalist utility designed as part of the Ampersand.js ecosystem, a modular JavaScript framework inspired by Backbone.js. Currently at stable version 1.0.1, this package provides a simple function for partial application and context binding. It allows developers to create new functions where initial arguments and the `this` context are pre-set, essentially acting as a custom `Function.prototype.bind` or a partial application helper. The project appears to be abandoned, with its last known activity aligning with the broader Ampersand.js project, which saw its primary development in the mid-2010s. It is exclusively a CommonJS module, predating widespread ES module adoption, and thus offers no direct ESM support or TypeScript typings. Its differentiators are its extreme simplicity and its tight integration within the specific Ampersand.js architectural patterns, rather than offering novel callback management strategies compared to modern JavaScript capabilities.

Common errors

error ReferenceError: require is not defined in ES module scope ↓

cause Attempting to use `require('amp-create-callback')` directly within an ECMAScript Module (ESM) file (`.mjs` or `type: module` in `package.json`).

fix

Change your import to use dynamic import(): import('amp-create-callback').then(module => { const createCallback = module; /* ... */ }); or refactor to use native Function.prototype.bind.

error TypeError: createCallback is not a function ↓

cause Incorrect ESM import syntax, such as `import { createCallback } from 'amp-create-callback';` where the module exports a default function, not a named one.

fix

For CommonJS modules exporting a single function, if you must use ESM, the correct (though still problematic for older CJS) syntax would be import createCallback from 'amp-create-callback';. However, the recommended fix is to use const createCallback = require('amp-create-callback'); or to use native Function.prototype.bind.

error TypeError: fn.apply is not a function ↓

cause The first argument passed to `createCallback` (`fn`) was not a callable function.

fix

Ensure the first argument passed to createCallback is a valid JavaScript function.

Warnings

breaking This package is a pure CommonJS module and does not natively support ES Modules (ESM) `import` statements. Attempting to import it in an ESM context will result in runtime errors. ↓

fix For Node.js ESM projects, you might need to use a dynamic `import()` statement or a CJS wrapper. For browser projects, ensure your bundler (e.g., Webpack, Rollup) is configured to handle CommonJS modules. Consider using `Function.prototype.bind()` or arrow functions for modern partial application instead.

deprecated The Ampersand.js project, including `amp-create-callback`, appears to be abandoned and is no longer actively maintained. No new features, bug fixes, or security patches are expected. ↓

fix Migrate to modern JavaScript features like `Function.prototype.bind()` for explicit context and partial application, or use arrow functions and closures for implicit context binding and argument currying. Modern alternatives offer better long-term support and broader compatibility.

gotcha The package does not ship with TypeScript declaration files (.d.ts). Users integrating into TypeScript projects will need to provide their own ambient type declarations (`declare module 'amp-create-callback';`) to avoid type errors. ↓

fix Create a `amp-create-callback.d.ts` file in your project (e.g., in a `types` directory) with a declaration like `declare module 'amp-create-callback' { function createCallback<T extends Function>(fn: T, context: any, ...args: any[]): T; export = createCallback; }`

gotcha The utility's functionality is equivalent to native JavaScript features (`Function.prototype.bind` or manual closure creation) and may not offer significant advantages in modern applications. Over-reliance can lead to less readable code compared to idiomatic modern JavaScript. ↓

fix Prefer `Function.prototype.bind(context, ...args)` or `(...newArgs) => fn.apply(context, [...initialArgs, ...newArgs])` for clearer intent and better maintainability, especially in newer codebases.

Install

npm install amp-create-callback

yarn add amp-create-callback

pnpm add amp-create-callback

Imports

createCallback

wrong

import createCallback from 'amp-create-callback';
// OR
import { createCallback } from 'amp-create-callback';

correct

const createCallback = require('amp-create-callback');

This package is a CommonJS module, primarily intended for Node.js or browser environments using bundlers that support CommonJS `require()`.

Quickstart

Demonstrates how to use `amp-create-callback` to create a new function with pre-bound arguments and a specified execution context.

const createCallback = require('amp-create-callback');

function greet(greeting, punctuation, name) {
  console.log(`${greeting}, ${name}${punctuation}`);
}

// Use createCallback to bind the 'this' context (null in this case)
// and pre-fill the first two arguments: 'Hello' and '!'
const sayHello = createCallback(greet, null, 'Hello', '!');

// Now, call sayHello with only the 'name' argument
sayHello('Alice'); // Expected: "Hello, Alice!"

// Another example: bind only the context and a single initial argument
function logMessage(prefix, message) {
  console.log(`${this.type || 'Log'}: ${prefix} - ${message}`);
}

const boundLogger = createCallback(logMessage, { type: 'APP' }, 'DEBUG');
boundLogger('User login successful'); // Expected: "APP: DEBUG - User login successful"

// Demonstrate with a class-like structure for context
class Calculator {
  constructor(offset) {
    this.offset = offset;
  }

  add(a, b) {
    console.log(`Result with offset: ${a + b + this.offset}`);
  }
}

const myCalc = new Calculator(10);
const addWithOffset = createCallback(myCalc.add, myCalc);
addWithOffset(5, 3); // Expected: "Result with offset: 18"