Mastering TypeScript 3 - Third Edition

Service Location anti-pattern

The ideas behind the service locator pattern were first introduced by Martin Fowler around 2004, in a blog titled Inversion of Control Containers and the Dependency Injection pattern (http://martinfowler.com/articles/injection.html). Since then, this pattern has been built and field-tested in a number of different languages and environments. In his book, Dependency Injection in .NET, Mark Seeman argues that the Service Location pattern is in fact an anti-pattern.

Mark's reasoning is that it is too easy to misunderstand the usage of a particular class when Service Location is used. In the extreme case, each function of a class may use different services, which means that the user of the class needs to read through ...