Constructor parameters not being injected

[Shawboy278]

Hello,

I've been using your example of abstract classes and I'm experincing what seems like constructor parameters not being injected/passed along. The following is a modified version of the example you have posted. I'm inexperienced with Deno/Typescript enough to be uncertain if this is a bug or something I'm misunderstanding of how the language works.

Thank you for any insight you can provide.

import "https://cdn.skypack.dev/@abraham/reflection@0.8.0";
import { assert } from "https://deno.land/std@0.103.0/testing/asserts.ts";
import { Service, ServiceCollection } from "https://deno.land/x/di/mod.ts";

abstract class IA {
    abstract foo(): string;
}

abstract class IB {
    abstract IndirectFoo(): string;
    abstract bar(): string;
}

@Service()
class A implements IA {
    public foo(): string {
        return "foo";
    }
}

@Service()
class B implements IB {
    constructor(
        private a: IA
    ) {}

    public IndirectFoo(): string {
        return this.a.foo();
    }

    public bar(): string {
        return "bar";
    }
}

const serviceCollection = new ServiceCollection();
serviceCollection.addTransient(IA, A);
serviceCollection.addTransient(IB, B);

const ib = serviceCollection.get(IB);

Deno.test("Is expected type", () => {
    assert(ib instanceof B);
});

Deno.test("Expects 'bar'", () => {
    assert(ib.bar() == "bar");
});

Deno.test("Expects 'foo'", () => {
    assert(ib.IndirectFoo() == "foo");
});

Error message:

Check file:///Users/jason/Code/example/example.ts
running 3 tests from file:///Users/jason/Code/example/example.ts
test Is expected type ... ok (6ms)
test Expects 'bar' ... ok (4ms)
test Expects 'foo' ... FAILED (9ms)

failures:

Expects 'foo'
TypeError: Cannot read property 'foo' of undefined
    at B.IndirectFoo (file:///Users/jason/Code/example/example.ts:28:23)
    at file:///Users/jason/Code/example/example.ts:51:15
    at asyncOpSanitizer (deno:runtime/js/40_testing.js:35:15)
    at resourceSanitizer (deno:runtime/js/40_testing.js:72:13)
    at exitSanitizer (deno:runtime/js/40_testing.js:99:15)
    at runTest (deno:runtime/js/40_testing.js:215:13)
    at Object.runTests (deno:runtime/js/40_testing.js:283:28)
    at async file:///Users/jason/Code/example/832dba8c-7c32-4f9d-a6da-f1050ff07807$deno$test.js:4:7