injct v0.0.7

injct

npm install injct --save

extremely simple dependency injection for nodejs

var injct = require('injct');

function UserRepository() {}
injct.register('userRepository', UserRepository);

function UserService(userRepository) {
    this.userRepository = userRepository;
    injct.apply(this);
}

var userService = new UserService();
assert.equal(userService.userRepository instanceof UserRepository);

two scopes: prototype and unique

• prototype: new instance when the class is requested

injct.register(name, class)

• unique: reuse the instance

injct.unique(name, class)

mocking

Say you have a registered UserRepository class like this:

var injct = require('injct');
injct.register('userRepository', UserRepository);

function UserRepository() {}
module.exports = UserRepository;

And an user service that expects that UserRepository to be injected

function UserService(userRepository) {
    this.userRepository = userRepository;
    injct.apply(this);
}

You can mock the repository behavior, no matter the scope

injct.register('userRepository', function AnotherRepository(){});

var userService = new UserService();
assert.ok(userService.userRepository instanceof AnotherRepository);