How to import/use Reflect in typescript

you have to import the type declarations together with the (js) library

npm install reflect-metadata -D

inside your .ts file:

 import "reflect-metadata";

As of today, @types/reflect-metadata is deprecated since reflect-metadata includes already its own typings.

So, to use them you just need to import the library (Uses the global scope). That's it.

1. Install it:
   npm install reflect-metadata --save

2. Import it:
   import 'reflect-metadata';

Typescript uses a Module loading paradigm that's a bit different than that of JavaScript.

Say you have a module Modulus that defines three classes A, B and C.

import { A } from "Modulus"

will import the class (or function) A from the module Modulus and make it available in your current module. If Typescript finds no export named A in Modulus and error will be thrown.

// Equivalent to the following in JavaScript:
// var ModuleNameOfYourChoice = require("Modulus")

import * as ModuleNameOfYourChoice from "Modulus"

will import all the exports declared within Modulus and make them available to the current module under the name ModuleNameOfYourChoice.

For your code, you need all the exports defined in reflect-metadata module and thus need to import it as

import * as Reflect from "reflect-metadata"

All the best!

Typescript documentation: http://www.typescriptlang.org/docs/handbook/modules.html#import