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what are reflect-metadata and its purpose?
What is syntax and purpose of using reflect-metadata?
Can some one provide the example for better understanding of the same?
How can be the reflect metadata helpful in implementing decorators in typescript.
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The Reflect. defineMetadata method lets you add a custom metadata value metadataValue which could be any JavaScript value to the target object (descendent of the Object ) or the target object's propertyKey property. You can add as many metadata values as you want as each metadata value is identified by a metadataKey .
Reflect is a built-in object that provides methods for interceptable JavaScript operations. The methods are the same as those of proxy handlers. Reflect is not a function object, so it's not constructible.
Metadata.js is a library for building offline-first browser-based applications.
Decorators provide a way to add both annotations and a meta-programming syntax for class declarations and members. Decorators are a stage 2 proposal for JavaScript and are available as an experimental feature of TypeScript. NOTE Decorators are an experimental feature that may change in future releases.
reflect-metadata Allows you to do runtime reflection on types.
The native (non reflect-metadata) version of type inference is much poorer than reflect-metadata and consists only of typeof and instanceof.
This blog post covers its features well : http://blog.wolksoftware.com/decorators-metadata-reflection-in-typescript-from-novice-to-expert-part-4
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