CODEWITHSUNDEEP
typescript
Poul K. Sørensen
Poul K. Sørensen

Reputation: 17530

extending typescript lib.d.ts, where to commit changes to

According to https://developer.mozilla.org/en-US/docs/Web/API/FileReader

interface FileReader extends MSBaseReader {
    error: DOMError;
    readAsArrayBuffer(blob: Blob): void;
    readAsDataURL(blob: Blob): void;
    readAsText(blob: Blob, encoding?: string): void;
}
declare var FileReader: {
    prototype: FileReader;
    new (): FileReader;
}

this from lib.d.ts should also have DONE,LOADING,EMPTY on the variable. How can I extend this, and do lib.d.ts has a public place where such changes can be committed to?

Upvotes: 1

Views: 1319

Answers (2)

Fenton
Fenton

Reputation: 250862

To get access to new properties before they are added to lib.d.ts you can extend the declarations. This can be done because interfaces in TypeScript are open.

So add a TypeScript file called something like libextensions.ts and add the following:

interface FileReader {
    EMPTY: number;
    LOADING: number;
    DONE: number;
}

You only need to put the missing bits here - they will be added to the lib.d.ts interface.

You can use this technique to stay up to date with working drafts and the compiler will tell you when lib.d.ts has been updated by issuing a duplicate declaration error.

If you have an instance of a FileReader, you don't need to access the constant via FileReader.prototype.DONE you can use the constant on the instance - example:

var fileReader = new FileReader();
var example = fileReader.DONE;

Upvotes: 4

basarat
basarat

Reputation: 276269

You should open a bug report here : http://typescript.codeplex.com/workitem/list/basic The typescript team manages lib.d.ts

Upvotes: 0

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