RegisterTypeIn

registerTypeIn is a programming utility used to register a type, such as a class or constructor function, within a type registry or dependency injection container. The function associates a token or name with the provided type so that the container can resolve instances later, often enabling decoupled components and dynamic composition.

Purpose and use cases

The primary purpose of registerTypeIn is to enable runtime type resolution. By registering a type, developers can reference it by token rather than by concrete implementation, supporting patterns like dependency injection, plugin systems, and modular architectures. It is commonly used in frameworks and IoC containers that support pluggable components, testability through mock replacements, and configurable lifecycles.

Typical behavior and options

A registerTypeIn call typically accepts a registry or container, the type (class or constructor), an optional token or alias, and an optional options object. Options may include lifecycle hints such as singleton or transient, as well as metadata about how dependencies should be injected. The registration adds a mapping from the token to the constructor and may also record resolution rules, scope, or constraints.

Example (conceptual)

registerTypeIn(container, SomeService, "some-service", { lifecycle: "singleton" });

This registers SomeService under the token "some-service" so requests for that token yield a single shared instance. If no token is provided, the system might use the type’s own name as the default token.

See also

Type registration, dependency injection, inversion of control containers, service registry, lifecycle management.