Function optionalBy

optionalBy<Instance extends object>(
    thisArg: any,
    Class: Constructor<Instance>,
    name?: string,
): undefined | Instance
Injects the instance associated with the given class, or undefined if the class is not registered in the container.

Compared to optional, optionalBy accepts a thisArg argument (the containing class) which is used to resolve circular dependencies.
Type Parameters
- Instance extends object
Parameters
- thisArg: any
  The containing instance, used to help resolve circular dependencies.
- Class: Constructor<Instance>
  The class to resolve.
- Optionalname: string
  The name qualifier of the class to resolve.
Returns undefined | Instance
- Defined in optional.ts:32
optionalBy<Value>(
    thisArg: any,
    token: Token<Value>,
    name?: string,
): undefined | Value
Injects the value associated with the given token, or undefined if the token is not registered in the container.

Compared to optional, optionalBy accepts a thisArg argument (the containing class) which is used to resolve circular dependencies.
Type Parameters
- Value
Parameters
- thisArg: any
  The containing instance, used to help resolve circular dependencies.
- token: Token<Value>
  The token to resolve.
- Optionalname: string
  The name qualifier of the token to resolve.
Returns undefined | Value
- Defined in optional.ts:49