value-dependencies.md

title	Value dependencies

Value dependencies

Static values can be registered with injector.setValue(), but always through one or more tokens:

import { InjectionToken, injectable, injector } from "@kayahr/di";

const secretCodeToken = new InjectionToken<number>("secret-code");

injector.setValue(12345, secretCodeToken);

@injectable({ inject: [ secretCodeToken ] })
class Luggage {
    public constructor(combination: number) {}
}

If you want type-based registration then use a class or factory registration instead.

Asynchronous values

Asynchronous values can be registered as promises:

const configToken = new InjectionToken<Config>("config");

injector.setValue(Promise.resolve({ verbose: true }), configToken);

@injectable({ inject: [ configToken ] })
class Component {
    public constructor(config: Config) {
        if (config.verbose) {
            console.log("Component created");
        }
    }
}

If you want to inject an asynchronous value by type then register a factory function instead.