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reflect-metadata

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reflect-metadata

Polyfill for Metadata Reflection API


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What is reflect-metadata?

The reflect-metadata npm package is a library that allows developers to perform metadata reflection operations in JavaScript. It is based on the metadata reflection API that is proposed for ECMAScript and is used by frameworks like Angular and decorators to add and read metadata annotations.

What are reflect-metadata's main functionalities?

Metadata Reflection

Allows defining metadata on a class or property. The code sample shows how to define custom metadata on a class 'MyClass' with a key 'custom' and a value 'metadataValue'.

Reflect.defineMetadata('custom', 'metadataValue', MyClass);

Metadata Retrieval

Enables retrieval of metadata from a class or property. The code sample demonstrates how to retrieve metadata from a class 'MyClass' using the key 'custom'.

let metadataValue = Reflect.getMetadata('custom', MyClass);

Metadata Deletion

Provides functionality to delete metadata from a class or property. The code sample illustrates how to delete metadata associated with a class 'MyClass' using the key 'custom'.

Reflect.deleteMetadata('custom', MyClass);

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Package last updated on 29 Mar 2024

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