{"id":14504,"library":"component-inherit","title":"Prototype Inheritance Utility","description":"The `component-inherit` package is a minimalist utility designed for establishing prototype inheritance in JavaScript. Released at a very early stage (current version 0.0.3), it was part of the now-defunct `component.io` ecosystem, as indicated by its `component install` instruction in the README. Its primary function, demonstrated through a simple `inherit(Child, Parent)` pattern, is to link prototypes, effectively achieving what `Child.prototype = Object.create(Parent.prototype)` or, more recently, `class Child extends Parent {}` accomplish natively in modern JavaScript. The package is effectively abandoned, given its very low version number, lack of updates, and reliance on an archaic module system (CommonJS) and installation method (component.io) that predates widespread npm adoption and native ES modules. It has no active release cadence and its utility has been entirely superseded by native language features.","status":"abandoned","version":"0.0.3","language":"javascript","source_language":"en","source_url":"https://github.com/component/inherit","tags":["javascript","inherit","utility"],"install":[{"cmd":"npm install component-inherit","lang":"bash","label":"npm"},{"cmd":"yarn add component-inherit","lang":"bash","label":"yarn"},{"cmd":"pnpm add component-inherit","lang":"bash","label":"pnpm"}],"dependencies":[],"imports":[{"note":"This package is a legacy CommonJS module from the component.io ecosystem and does not support ES modules. Direct `require` is the only functional import method.","wrong":"import inherit from 'inherit';","symbol":"inherit","correct":"const inherit = require('inherit');"},{"note":"There is no named export for this module; it exports a single function as its module.exports object.","wrong":"import { inherit } from 'inherit';","symbol":"default import","correct":"N/A"}],"quickstart":{"code":"const inherit = require('inherit');\n\n// Define a base constructor function (the parent)\nfunction Human(name) {\n  this.name = name;\n}\nHuman.prototype.greet = function() {\n  return `Hello, my name is ${this.name}`;\n};\n\n// Define a derived constructor function (the child)\nfunction Woman(name, age) {\n  Human.call(this, name); // Call parent constructor for inherited properties\n  this.age = age;\n}\n\n// Establish prototype chain using component-inherit\ninherit(Woman, Human);\n\n// Add Woman-specific methods to its prototype\nWoman.prototype.identify = function() {\n  return `${this.greet()} and I am ${this.age} years old.`;\n};\n\n// Example usage\nconst alice = new Woman('Alice', 30);\nconsole.log(alice.greet());\nconsole.log(alice.identify());\n\n// Verify instanceof chain\nconsole.log(alice instanceof Woman); // true\nconsole.log(alice instanceof Human); // true\nconsole.log(Object.getPrototypeOf(Woman.prototype) === Human.prototype); // true","lang":"javascript","description":"Demonstrates how to use `component-inherit` to establish a prototype chain between two constructor functions in a CommonJS environment."},"warnings":[{"fix":"Rewrite your code to use `class extends Parent {}` syntax for ES6+ or `Child.prototype = Object.create(Parent.prototype)` for older environments. If calling the parent constructor, use `Parent.call(this, ...args)`.","message":"The `component-inherit` package is entirely superseded by native JavaScript features (e.g., `class extends`, `Object.setPrototypeOf`, or manual prototype assignment with `Object.create`). It should not be used in modern JavaScript development.","severity":"deprecated","affected_versions":">=0.0.1"},{"fix":"Avoid using this package. If you must, ensure your project's tooling can handle CommonJS modules from npm, but be aware of its age and lack of support.","message":"This package relies on the `component.io` installation method (`component install`), which is obsolete. It is available on npm but is not maintained for modern environments.","severity":"gotcha","affected_versions":">=0.0.1"},{"fix":"Do not attempt to `import` this module. If using a bundler, ensure it can transpile CommonJS `require` statements. Prefer modern native solutions instead.","message":"The package is a pure CommonJS module and does not provide ES module exports. Attempting to `import` it will result in errors in native ESM environments or bundling issues.","severity":"gotcha","affected_versions":">=0.0.1"},{"fix":"Avoid using in TypeScript. If absolutely necessary, create a `declare module 'inherit';` declaration file.","message":"This package offers no type definitions for TypeScript. Using it in a TypeScript project will require manual declaration files or `// @ts-ignore` directives, further indicating its obsolescence.","severity":"gotcha","affected_versions":">=0.0.1"}],"env_vars":null,"last_verified":"2026-04-19T00:00:00.000Z","next_check":"2026-07-18T00:00:00.000Z","problems":[{"fix":"Ensure that within your child constructor, you explicitly call the parent constructor using `Parent.call(this, ...args);` before any child-specific initialization.","cause":"Attempting to use `inherit` without correctly calling the parent constructor to initialize instance properties within the child constructor.","error":"TypeError: Cannot read properties of undefined (reading 'call')"},{"fix":"Use CommonJS `require` syntax: `const inherit = require('inherit');`.","cause":"Attempting to import `inherit` using ES module named import syntax (`import { inherit } from 'inherit';`) when it is a CommonJS module that exports a default function.","error":"SyntaxError: Named export 'inherit' not found. The requested module 'inherit' does not provide an export named 'inherit'"}],"ecosystem":"npm"}