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Reflection

Lightweight ES Module implementation of reflect-metadata to work with TypeScript’s experimental decorator support.

Why?

The main reason for this library is to provide a much smaller implementation that can be included as a module.

• ES module
  • reflection can be loaded with <script type="module" src="..."></script>
• Size (uncompressed)
  • reflect-metadata is ~50K
  • core-js/es7/reflect is ~80K
  • @abraham/reflection is ~3K

Read about how to drop 20K from your production Angular app by switching to this.

Install

npm install @abraham/reflection

Usage

import '@abraham/reflection';
Reflect.defineMetadata(metadataKey, metadataValue, target);

You can also import Reflection:

import { Reflection as Reflect } from '@abraham/reflection';
Reflect.defineMetadata(metadataKey, metadataValue, target);

API

Reflection does not currently cover the complete API surface of reflect-metadata. The following methods are available:

Reflect.decorate(...);
Reflect.defineMetadata(...);
Reflect.getMetadata(...);
Reflect.hasMetadata(...);
Reflect.getOwnMetadata(...);
Reflect.hasOwnMetadata(...);
Reflect.metadata(...);