import { Injectable, Optional, SkipSelf } from "injection-js";

@Injectable()
export class DependencyService {}

@Injectable()
export class DIService {
  constructor(
    @SkipSelf()
    @Optional()
    private dependencyService: DependencyService
  ) {}
}

import { Injectable, Optional, SkipSelf, Inject } from "injection-js";
export class DependencyService {
}
export class DIService {
    constructor(private dependencyService: DependencyService) { }
    static parameters = [[new Optional(), new SkipSelf(), new Inject(DependencyService)]];
}

npm install injection-js-transformer

import { resolve } from "path";
import { Program } from "typescript";
import injectionTransformer from "injection-js-transformer";

const config = {
  module: {
    rules: [
      {
        test: /.ts$/,
        use: [
          {
            loader: "ts-loader",
            options: {
              configFile: resolve(__dirname, "./tsconfig.json"),
              getCustomTransformers: (program: Program) => {
                return {
                  before: [injectionTransformer(program)],
                };
              },
            },
          },
        ],
      },
    ],
  },
};

export default config;