What does it mean when TsLint says "expected callSignature to have a typedef."

Question

I have a function in my code:

networkStop = (action: string = null) => {
    this.action[action] = false;
    this.net = false;
    this.netd = false;
}

I'm getting a TsLint error saying:

Message 4   TsLint: expected callSignature to have a typedef.

Can someone explain what this means?

basarat · Accepted Answer · 2014-08-23T07:29:25.993

136

"Missing Type definition" See : https://github.com/palantir/tslint/blob/master/src/rules/typedefRule.ts for details. Basically some annotation (for a function because callSignature) is missing.

Probably the fix (specify the return type explicitly) :

networkStop = (action: string = null):void => {
    this.action[action] = false;
    this.net = false;
    this.netd = false;
}

edited Aug 23 '14 at 07:29

answered Aug 23 '14 at 06:48

basarat

Can you tell me is putting :any after the () the same as void? In this example it returns nothing so how could I specify that? Thanks – Aug 23 '14 at 06:54
3

Not its not the same. But `any` is compatible with `void` i.e. `any` can take *anything* even `void`. I would use `void` in this case ;) – basarat Aug 23 '14 at 07:09
For the void do I just enter :void instead of :any or is there a special syntax ? – Aug 23 '14 at 07:19
it was useful for me – Alejandro Gonzalez Dec 12 '20 at 17:08
How to use this for a getter function? – Rigin Oommen May 11 '21 at 10:44

score 22 · Answer 2 · answered Nov 17 '20 at 13:20

22

To avoid the build error. in the tslint.json file write code like:-

"typedef": [
  false,
  "call-signature"
],

This line of code in tslint.json does not make the return type of method required.

answered Nov 17 '20 at 13:20

Shashikant Pandit

2 Answers2