Clear require cache in Node.js

index.js

//based on http://stackoverflow.com/questions/9210542/node-js-require-cache-possible-to-invalidate

function clearRequireCache() {
  Object.keys(require.cache).forEach(function(key) {
    delete require.cache[key];
  });  
}

var myModule1 = require('./my-module');
console.log(myModule1.counter); // 0

myModule1.counter += 1;
console.log(myModule1.counter); // 1

var myModule2 = require('./my-module');
console.log(myModule2.counter); // 1

clearRequireCache();

// since cache is cleared, counter will be 0 on the new instance
myModule1 = require('./my-module');
console.log(myModule1.counter); // 0
// however, old 'instance' still maintains state
console.log(myModule2.counter); // 1

my-module.js

module.exports.counter = 0;

Hello,
have a look at my module-invalidate module that allows you to invalidate a module and make it automatically reloaded on further access.

Example:

module ./myModule.js

module.invalidable = true;

var count = 0;
exports.count = function() {

	return count++;
}

main module ./index.js

require('module-invalidate');

var myModule = require('./myModule.js');

console.log( myModule.count() ); // 0
console.log( myModule.count() ); // 1

module.constructor.invalidateByExports(myModule);

console.log( myModule.count() ); // 0
console.log( myModule.count() ); // 1

@FranckFreiburger unfortunately you library does not invalidates any modules in node v12.6.0.

Solution described above still works great!

@FranckFreiburger same here. I like the idea of your library - removing all dependants - but my module doesnt get reloaded so it must be missing something.

Its just better to use Jest in many cases https://jestjs.io/docs/en/jest-object#mock-modules

Thank you man!
helped me a lot :D

Specifically; jest.resetModules() is your friend here: https://jestjs.io/docs/jest-object#jestresetmodules