monkeypatch

    1.0.0 • Public • Published

    node-monkeypatch

    Slightly easier monkeypatching.

    Installation

    npm install monkeypatch
    

    Usage

    monkeypatch(target : Object, method : String, handler : Function) : Function

    Monkeypatching a method/function on a target object replaces the method with a newly supplied handler function which will get called instead of the original.

    The original method will be returned by monkeypatch(), and will also be passed as the first argument to the new handler function. See examples.

    Examples

    Patching a function
    var monkeypatch = require('monkeypatch');
     
    // Monkeypatch Date.now()
    monkeypatch(Date, 'now', function(original) {
      // Round to 15-minute interval.
      var ts = original();
      return ts - (ts % 900000);
    });
     
    var timestamp = Date.now(); // returns a rounded timestamp
    ...
    Patching an instance method
    var monkeypatch = require('monkeypatch');
     
    // Monkeypatch Date#getTime()
    monkeypatch(Date.prototype, 'getTime', function(original) {
      // Round to 15-minute interval.
      var ts = original();
      return ts - (ts % 900000);
    });
     
    var date      = new Date();
    var timestamp = date.getTime(); // returns a rounded timestamp
    ...
    Argument handling
    var monkeypatch = require('monkeypatch');
     
    // Monkeypatch Date#setTime()
    monkeypatch(Date.prototype, 'setTime', function(original, ts) {
      // Round to 15-minute interval.
      ts = ts - (ts % 900000);
      // Call the original.
      return original(ts);
    });
     
    var date = new Date();
    date.setTime(date.getTime()); // set to a rounded timestamp
    ...
    Unpatching
    var monkeypatch = require('monkeypatch');
     
    // Monkeypatch Date.now()
    monkeypatch(Date, 'now', function() { return 143942400000; });
     
    console.log(Date.now()); // logs 143942400000
     
    Date.now.unpatch();
     
    console.log(Date.now()); // logs current time

    Keywords

    none

    Install

    npm i monkeypatch

    DownloadsWeekly Downloads

    2,497

    Version

    1.0.0

    License

    MIT

    Last publish

    Collaborators

    • robertklep