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?

Kristynkrock

Answer 1

"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;
}

Veilleux

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 – Kristynkrock

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 ;) – Veilleux

For the void do I just enter :void instead of :any or is there a special syntax ? – Kristynkrock

it was useful for me – Doorbell

How to use this for a getter function? – Encephalomyelitis

Answer 2

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.

Particia

this is not the answer for this question – Desilva