What is the @ symbol in TypeScript?

Issue

Why in components or directives do the metadata or decorators have the @ symbol (e.g. @Component, @Directive)?

What is the purpose of it, and when should I use it?

Solution

It stands for decorators. It is not TypeScript specific.

Google "javascript decorator" to learn more about it.

For example:

http://javascript.info/tutorial/decorators

https://medium.com/google-developers/exploring-es7-decorators-76ecb65fb841#.jzu13e5lr

For up to date information about their standard implementation and when it will finally be released (future ECMAScript versions), see this page: https://github.com/tc39/proposal-decorators

And as @hardikModha mentioned, you can also look up the TypeScript handbook: http://www.typescriptlang.org/docs/handbook/decorators.html

Answered By - unional