typescript compile error with unknown google.maps object type

Question

While compiling typescript I get an error:

src\app\foo.ts (129,25): Index signature of object type implicitly has an 'any' type. (7017)

on the following line:

const tmode = google.maps['DirectionsTravelMode'].DRIVING;

google.maps.DirectionsTravelMode doesn't exist in my typings file which I installed using typings install google.maps --save --ambient

I could add it but it would be lost when I checkout my project and reinstall the typings.

This is just one item in the file which is preventing my build from succeeding. What is the easiest way to get typescript to ignore this line? I have tested the code already and it runs correctly.

You could cast it to the type: tmode = (<any>google).maps.DirectionsTravelMode.DRIVING; — Corey Alix
– Corey Alix, Commented Mar 31, 2016 at 21:34
@CoreyAlix: That works! I had tried const tmode: any = ... but it didn't work. Please post an answer so I can accept! Thanks — chriskelly
– chriskelly, Commented Mar 31, 2016 at 21:42

Corey Alix · Accepted Answer · 2016-04-01 01:38:18Z

2

You could extend the module yourself:

declare module google.maps {
    export enum DirectionsTravelMode {
        DRIVING
    }
}

NOTE: this would have to go in a declaration file such as mygoogle.d.ts.

edited Apr 1, 2016 at 1:38

answered Apr 1, 2016 at 1:30

Corey Alix

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Comments

basarat · Accepted Answer · 2016-03-31 22:40:01Z

1

Index signature of object type implicitly has an 'any' type.

Instead of indexing just assert the any yourself:

const tmode = (google.maps as any).DirectionsTravelMode.DRIVING;

answered Mar 31, 2016 at 22:40

basarat

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1 Comment

chriskelly Over a year ago

Thanks. This solution works and is helpful but @CoreyAlix already suggested similar in a comment above so I will give him a chance to answer before accepting.

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