quick-lint-js

Find bugs in JavaScript programs.

E0105: missing parameters for arrow function

Arrow functions need a parameter list. It is a syntax error to omit the parameter list before =>, even if the arrow function takes no parameters:

setInterval(=> {
  console.log("it is now", new Date());
}, 1000);

To fix this error, write an empty parameter list before =>:

setInterval(() => {
  console.log("it is now", new Date());
}, 1000);

Documentation for other errors