Typescript : TS7017 Index signature of object type implicitly has an 'any' type in a loop

Question

I am having the following code in typescript :

export class Custom {
     [k: string]: any // Index Signature

     // parameters example
     // let o:Object = {"blah":1, "foo": "lol"}
     // let arr: Array<string> = ["blah", "foo"]
    constructor(o: Object, p: Array<string>)
     for(let prop of arr) {
        let p: any = (<any>o)[prop]
        if (p !== undefined) {
            this[prop] = p
        }
      }
}

I keep having TS7017 Index signature of object type implicitly has an 'any' type on this[prop] = p

Thanks !

Edit : Adding the index signature solved my problem.

Possible duplicate of [How do I prevent the error "Index signature of object type implicitly has an 'any' type" when compiling typescript with noImpicitAny flag enabled?](http://stackoverflow.com/questions/32968332/how-do-i-prevent-the-error-index-signature-of-object-type-implicitly-has-an-an) — Paarth, May 30 '16 at 09:37
I did update the case, so it's not a duplicate of that one anymore. — Scipion, May 30 '16 at 09:51

score 4 · Accepted Answer · answered May 31 '16 at 00:40

4

TS7017 Index signature of object type implicitly has an 'any' type

Whatever this is in that code, it does not have an index signature (so implicit any).

Quick Fix

Switch off noImplicitAny till you get more comfortable working with TypeScript.

answered May 31 '16 at 00:40

basarat

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I am gonna edit my post to include this, which is only a simple class. However, I'd be very interested into seeing how to create an index signature. – Scipion May 31 '16 at 07:11
1

Thanks the Index Signature fixed my problem. – Scipion May 31 '16 at 08:00

Typescript : TS7017 Index signature of object type implicitly has an 'any' type in a loop

1 Answers1

Quick Fix