migrating function to typescript from JS

Question

I am implementing a working JS function to typescript, but I'm getting an error on parameters: "error, success"

[tslint] Parentheses are required around the parameters of an arrow function definition (arrow-parens)

function chapa() {
  console.log('altered');
  TouchID.isSupported()
  .then(authenticate)
  .catch(error => {
    AlertIOS.alert('TouchID not supported');
  });
}

so the "error" is underlined with error, with this message:

[tslint] Parentheses are required around the parameters of an arrow function definition (arrow-parens)

how should I pass then the "error" parameter?, cheers

So add () around the parameters like it says.... If you do not understand the error messages, look them up, they typically have solutions. eslint.org/docs/rules/arrow-parens — epascarello
– epascarello, Commented Apr 4, 2018 at 1:34

CertainPerformance · Accepted Answer · 2018-04-04 01:34:51Z

4

Just as it says, put parentheses around the parameter:

.catch((error: any) => {

edited Apr 4, 2018 at 1:34

answered Apr 4, 2018 at 1:31

CertainPerformance

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1 Comment

manuelBetancurt Over a year ago

hi , thanks, but it also needed the type, so (error : any)

raychz · Accepted Answer · 2018-04-04 01:47:41Z

4

If you'd rather not add parentheses around the parameter (it's not strictly required by Typescript), add the following to the rules object in your tslint.json file.

"arrow-parens": [true, "ban-single-arg-parens"]

Check out https://palantir.github.io/tslint/usage/configuration/ and https://palantir.github.io/tslint/rules/arrow-parens/ for more details.

edited Apr 4, 2018 at 1:47

answered Apr 4, 2018 at 1:37

raychz

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