Failing to @inject into class constructor

[ryall]

I believe I have everything set up correctly but @inject is failing to inject into the class constructor with the error: Missing required @inject or @multiInject annotation in: argument 0 in class AccountFactory despite being defined on both properties.

Using @inject on class properties works as expected. I'm only having this problem with constructor params.

Expected Behavior

This should inject the correct service

@injectable()
export class AccountFactory {
  constructor(
    @inject($.MongoDb.Client) private mongo: MongoClient,
    @inject($.Security.PasswordHasher) private passwordHasher: IPasswordHasher,
  ) {}
}

Current Behavior

I get the error: Missing required @inject or @multiInject annotation in: argument 0 in class AccountFactory.

Types are definitely correct.

Property injection works as expected:

@injectable()
export class AccountFactory {
  @inject($.MongoDb.Client)
  private mongo: MongoClient;

  @inject($.Security.PasswordHasher)
  private passwordHasher: IPasswordHasher;
}

Possible Solution

Maybe I have configured something incorrectly, so here are the relevant files:

Inversify container definition:

export const container = new Container();

container.bind($.MongoDb.Client).toConstantValue(mongoClient);
container
  .bind<IPasswordHasher>($.Security.PasswordHasher)
  .to(BCryptPasswordHasher)
  .inSingletonScope();
container
  .bind($.MongoDb.Factory.Account)
  .to(AccountFactory)
  .inSingletonScope();

tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "lib": ["esnext", "dom"],
    "types": ["node", "jest", "reflect-metadata"],
    "module": "commonjs",
    "moduleResolution": "node",
    "noEmit": true,
    "pretty": true,
    "skipLibCheck": true,
    "sourceMap": true,
    "allowJs": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noImplicitAny": false,
    "noUnusedLocals": false,
    "strictNullChecks": true,
    "forceConsistentCasingInFileNames": true,
    "suppressImplicitAnyIndexErrors": true,
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
}

.babelrc:

{
  "presets": [["@babel/env"], ["@babel/typescript"]],
  "plugins": [
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ],
    [
      "@babel/plugin-proposal-class-properties",
      {
        "loose": true
      }
    ]
  ]
}

webpack.js:

const nodeExternals = require('webpack-node-externals');

const paths = require('./paths');

module.exports = {
  mode: 'production',
  entry: ['reflect-metadata', '@babel/polyfill', `${paths.src}/index.ts`],
  node: {
    process: false,
  },
  output: {
    filename: 'app.js',
    path: paths.build,
  },
  // Auto resolution
  resolve: {
    extensions: ['.ts', '.js'],
    modules: ['node_modules', `${paths.root}/node_modules`],
  },
  // File and Webpack module rules
  module: {
    rules: [
      {
        test: /\.[tj]s$/,
        include: paths.root,
        loader: 'babel-loader',
        options: {
          cacheDirectory: true,
        },
      },
    ],
  },
  externals: [
    nodeExternals(), // Link modules externally as we don't need to bundle for a server
  ],
};

Context

Without this, I cannot isolate units for testing without relying on Inversify rebinds.

Your Environment

Inversify: 5.0.1 reflext-metadata: 0.1.12

[arturgieralt]

I had the same issue when I was using babel. Use tsloader instead of it! Here you can find my config files: https://github.com/arturgieralt/realTimeGame

[yaitskov]

so did anybody open an issue in babel project?

[CharanRoot]

i faced similar issue. after importing reflect-metadata package fixed issue.

[mcshaz]

I was having a similar issue in typescript with optional properties coming after the injected properties 'missing required @inject on argument 2'. The solution for me was to explicitly assign undefined to the optional properties i.e.

constructor(@inject(TYPES.IFetch) updateProvider: IFetch,
            @inject(TYPES.ILogger) logger: ILogger,
            indexedDb?: IDBFactory, 

... became

constructor(@inject(TYPES.IFetch) updateProvider: IFetch,
            @inject(TYPES.ILogger) logger: ILogger,
            indexedDb: IDBFactory | undefined = void 0,

as a small aside, ideally the error message would state arguments[2] rather than argument 2 - as this would be more explicit that it was referring to the index.

[wyzzy]

I'm on RN 0.59.5, TS 3.4.5, Babel 7.4.4 (core, runtime & plugin-proposal-decorators). I had happily been using @injectable()as a class decorator for ages. When I introduced @inject in the parameter list of a class constructor for the first time, the 'standard' RN project recommendations for Babel & Metro config gave an Unexpected @ token error during the bundling process.

I had to switch to using react-native-typescript-transformer in my metro.config.js to resolve the problem.

module.exports = {
  transformer: {
    getTransformOptions: async () => ({
      transform: {
        experimentalImportSupport: false,
        inlineRequires: false,
      },
    }),
    babelTransformerPath: require.resolve('react-native-typescript-transformer')
  },
};

[nsainaney]

I have set up a simple repo to illustrate this here: https://github.com/nsainaney/inversifyBabel

react-native-typescript-transformer does not seem to help. The codebase is quite simple:

// services.ts
import { Container } from 'inversify'

const kernel = new Container()

class Hello {
    sayHi() {
        console.log('Hi')
    }
}

class There {
    sayThere() {
        console.log('There')
    }
}

kernel.bind('hello').to(Hello)
kernel.bind('there').to(There)

// index.ts
import 'reflect-metadata'
import React from 'react'
import './services'
import { Text, View } from 'react-native';
import { injectable, inject } from 'inversify'

@injectable()
export default class App extends React.Component {

    @inject('hello')
    hello

    @inject('there')
    there

    componentDidMount() {
        this.hello.sayHi()              // CRASHes here as hello is undefined
        this.there.sayThere()
    }

  render() {
    return (
      <View>
        <Text>Open up App.js to start working on your app!</Text>
      </View>
    );
  }
}

[nsainaney]

I was finally able to fix the above. I was missing:

1. Use lazyInject instead of inject
2. @injectable() was missing on class Hello and class There

I've updated the codebase here: https://github.com/nsainaney/inversifyBabel. Hope this helps others out

[victorkurauchi]

I've added what @wyzzy suggested and it worked fine.

• "react-native": "0.61.4",
• "@babel/plugin-proposal-decorators": "^7.7.0",
• "@babel/core": "^7.7.2",

babel.config.js

module.exports = function(api) {
  api.cache(true);
  return {
    presets: ['module:metro-react-native-babel-preset', 'module:react-native-dotenv'],
    plugins: [
      ['@babel/plugin-proposal-decorators', { 'legacy': true }],
    ]
  };
};

metro.config.js

module.exports = {
  transformer: {
    getTransformOptions: async () => ({
      transform: {
        experimentalImportSupport: false,
        inlineRequires: false,
      },
    }),
    babelTransformerPath: require.resolve('react-native-typescript-transformer')
  },
};

[jgornick]

For anyone that runs into this, I solved my babel-only solution by using https://github.com/WarnerHooh/babel-plugin-parameter-decorator

[martppa]

@ryall I think the problem here is just that Inversify doesn't support class member injection directly in constructor. If you want to inject in the constrcutor you have to turn it into normal params by removing the visibility modifier.

[am0wa]

Check the stackoverflow.com::babel-7-inversify-4-webpack-4-unexpected-character-on-inject answer.

babel-plugin-transform-typescript-metadata plugin helps. Thx gods, guys made this plugin, wish it would be part of @babel/preset-typescript to work out of box.

[RyanGhd]

I had the same issue using constructor injection in a react app which was created using create-react-app (react 17, react-scripts 4). this is how the issue was fixed for me: 1- install packages

npm install --save customize-cra react-app-rewired inversify-inject-decorators 
npm install --save-dev @babel/plugin-proposal-class-properties @babel/plugin-proposal-decorators @babel/preset-typescript babel-plugin-transform-typescript-metadata

(I'm not sure if all of those dev-dependencies are required though)

2- update package.json build and start scripts:

"start": "react-app-rewired start",
"build": "react-app-rewired build",

3- add a file called config-overrides.js at the same level as package.json which includes the following:

const {
    override,
    addBabelPlugins,
} = require("customize-cra");

module.exports = override(
    ...addBabelPlugins(
        "babel-plugin-transform-typescript-metadata", 
    ),
);

you can read about it here

[Glebario]

I'm on RN 0.59.5, TS 3.4.5, Babel 7.4.4 (core, runtime & plugin-proposal-decorators). I had happily been using @injectable()as a class decorator for ages. When I introduced @inject in the parameter list of a class constructor for the first time, the 'standard' RN project recommendations for Babel & Metro config gave an Unexpected @ token error during the bundling process.

I had to switch to using react-native-typescript-transformer in my metro.config.js to resolve the problem.

module.exports = {
  transformer: {
    getTransformOptions: async () => ({
      transform: {
        experimentalImportSupport: false,
        inlineRequires: false,
      },
    }),
    babelTransformerPath: require.resolve('react-native-typescript-transformer')
  },
};

I used inversify and mobx in my project. I also use expo and all possible expo modules. This solution eliminates the problem, but leads to many other problems that will emerge later and all of them will be related to expo. I had to abandon the react-native-typescript-transformer in favor of the default metro transformer. Therefore, if you use expo or are going to use it, I strongly advise you not to use react-native-typescript-transformer. Otherwise, unexpected surprises may await you in the future. For me, this problem remains relevant.

[MehediEhteshum]

In my project, I had similar issues caused by babel and inversify @inject directive usage. I used Metro server (not Expo). I believe the solution must be similar for both. I couldn't find a standalone solution. After much trial and error, I solved it. I hope my solution will save someone a lot of time.

You can find my detailed answer here >> https://stackoverflow.com/a/78696852/13607767