TypeScript reflect-metadata Cannot find name 'Symbol'

Question

I was reading this http://www.typescriptlang.org/docs/handbook/decorators.html#class-decorators

but, Error can not find Symbol, I do not know what it is Symbol if this is part of reflect-metadata or it was part of reflect-metadata

import "reflect-metadata"; //change for my path

const formatMetadataKey = Symbol("format");   <-- Cannot find name 'Symbol'.

function format(formatString: string) {
    return Reflect.metadata(formatMetadataKey, formatString);  <-- Work
}

function getFormat(target: any, propertyKey: string) {
    return Reflect.getMetadata(formatMetadataKey, target, propertyKey); <-- Work
}

I have to import something else to Symbol?, or this has changed, someone knows I'm doing wrong.

---

Update:

I think the solution is that Amid comment on ES6, for some circumstance, my TSconfig, was not working all that well, but after some changes worked, but as a note saying.

• for example change or used es6 compiler option, it shows -> Cannot find name 'Symbol'
• if you compile error disappears, but if you make changes to the file, adds something more variable ect or a simple newline, the editor indicates the error mentioned earlier, but if you recompile the error disappears and so all the time but seems to work.

Answer 1

To get more info about Symbol read this document: link

To get rid of the error: target ES6 instead of ES5.