I am confused about passing a value in the constructor using a singleton class in TypeScript.
mycode .ts
import {singleton} from "tsyringe";
@singleton()
class Bar {
constructor(value: string)
{
this.value = value
}
}
// another file
import "reflect-metadata";
import {container} from "tsyringe";
import {Bar} from "./bar";
const obj = container.resolve(Bar);
Can someone provide an example code on how to pass a value in the constructor using the constainer .resolve function?
If you want to pass a value into the constructor, you can follow these steps:
import {injectable} from "tsyringe";
@injectable()
class Bar {
private num: number;
constructor(@inject("NumberValue") value: number) {
this.num = value;
}
}
// Another file
import "reflect-metadata";
import {container} from "tsyringe";
import {Bar} from "./bar";
const num = 42;
container.register("NumberValue", { useValue: num });
const instance = container.resolve(Bar);
@user1762087, in response to your inquiry, if you wish to provide distinct parameters to constructors for individual instances, a possible approach would be like this:
import "reflect-metadata";
import {container} from "tsyringe";
import {Bar} from "./bar";
const str = "example";
container.registerInstance("AnotherName", { useValue: str });
const new_instance = container.resolve(Bar);
// If needed, clear previously registered instances using registerInstance()
container.clearInstances();
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