resnap

Simple API for capturing and restoring Node's require() cache state.

Usage

const resnap = require('resnap')

const restore = resnap(); // Capture require() cache state

// ... require() some modules, run some code, etc...

restore();  // Restore previous cache state

Example: Resetting Mocha test state

In the Mocha test file below, foo1, foo2, and foo3 are all distinct instances of the 'foo' module due to beforeEach(resetCache) clearing the require() cache state before each test.

const resetCache = require('resnap')(); // Capture "clean" cache state

describe(__filename, function() {
  beforeEach(resetCache);

  it('test 1', function(done) {
    const foo1 = require('./foo'); // Loads 'foo' module from disk
    // ...
    done();
  });

  it('test 2', function(done) {
    const foo2 = require('./foo'); // Loads 'foo' from disk (yes, again!)
    // ...
    done();
  });

  it('test 3', function(done) {
    const foo3 = require('./foo'); // Loads 'foo' from disk (yes, again!)
    // ...
    done();
  });
});