Patchie

Patchie is a Type-safe monkey-patching utility for Node.js.

⚠️ Monkey-patching can override the default behavior of a function. Do not monkey-patch unless you know what you are doing.

API Reference

• setOptions -

  Possible Options:

  {
    logger: console.log; // You can provide a custom logger here
  }

• wrap - patchie.wrap(nodule, name, wrapper)

  • nodule: The object containing the property to be wrapped.
  • name: The key of the property to be wrapped.
  • wrapper: A function that will be used to wrap the original property.

  Returns the wrapped function.

  Suppose you have an object:

  const obj = {
    greet: function () {
      console.log("Hello");
    },
  };

  You can wrap the greet function like this:

  import patchie from "patchie";
  
  patchie.wrap(obj, "greet", (original) => {
    return function () {
      console.log("Before greeting");
      original.apply(this, arguments);
      console.log("After greeting");
    };
  });

  After this, calling obj.greet() will print:

  Before greeting
  Hello
  After greeting

• unwrap - patchie.unwrap(nodule, name)

  • nodule: The object containing the property to be unwrapped.
  • name: The key of the property to be unwrapped.

  Restores the wrapped property to its original state.

  To revert a wrapped function back to its original form:

  patchie.unwrap(obj, "greet");

Credits:

• shimmer.js - Patchie is heavily inspired by the shimmer package. Shimmer is unmaintained for last 5 years and have few minor edge cases.