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What is custom-function?

patrickjs/custom-function — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2024-11-05

★ 1Audience · developerComplexity · 3/5StaleSetup · easy

In one sentence

A small library that lets you create custom functions with class-like features (methods, private fields, super calls) without unsafely extending Function.

Mindmap

mindmap
  root((custom-function))
    Inputs
      Plain function
      Any constructor
    Outputs
      Callable class-like object
      Extended constructors
    Use Cases
      Build callable validators
      Extend HTMLDivElement
    Tech Stack
      JavaScript
    Audience
      Developer

Code map

Detail Auto

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filefunction / class

What do people build with it?

USE CASE 1

Build a callable validator function that also exposes methods like .withMessage() or .optional().

USE CASE 2

Give a function private fields, getters, setters, and super calls like a regular class.

USE CASE 3

Use the factory export to safely extend other hard-to-extend constructors, like HTMLDivElement.

USE CASE 4

Build a DSL where functions need to behave like objects with internal state.

What is it built with?

JavaScript

How does it compare?

patrickjs/custom-function0xkinno/neuralvault0xmayurrr/ai-contractauditor
Stars111
Language—TypeScriptTypeScript
Last pushed2024-11-05——
MaintenanceStale——
Setup difficultyeasyhardeasy
Complexity3/54/52/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 30min

Aimed at framework/library authors rather than typical app developers.

License is not stated in the available content.

Copy-paste prompts

Prompt 1
Show me how to use this custom-function library to make a callable validator with a .withMessage() method.
Prompt 2
Explain how this library avoids calling the real Function constructor while still giving functions class features.
Prompt 3
Help me use the factory export from this repo to extend HTMLDivElement safely.
Prompt 4
Compare this library's approach to using Object.defineProperties for adding methods to a function.

Frequently asked questions

What is custom-function?

A small library that lets you create custom functions with class-like features (methods, private fields, super calls) without unsafely extending Function.

Is custom-function actively maintained?

Stale — no commits in 1-2 years (last push 2024-11-05).

What license does custom-function use?

License is not stated in the available content.

How hard is custom-function to set up?

Setup difficulty is rated easy, with roughly 30min to a first successful run.

Who is custom-function for?

Mainly developer.

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