Rule: only-arrow-functions

Disallows traditional (non-arrow) function expressions.

Note that non-arrow functions are allowed if ‘this’ appears somewhere in its body (as such functions cannot be converted to arrow functions).

Rationale

Traditional functions don’t bind lexical scope, which can lead to unexpected behavior when accessing ‘this’.

Config

Two arguments may be optionally provided:

• "allow-declarations" allows standalone function declarations.
• "allow-named-functions" allows the expression function foo() {} but not function() {}.

Config examples

"only-arrow-functions": true

"only-arrow-functions": [true, "allow-declarations", "allow-named-functions"]

Schema

{
  "type": "array",
  "items": {
    "type": "string",
    "enum": [
      "allow-declarations",
      "allow-named-functions"
    ]
  },
  "minLength": 0,
  "maxLength": 1
}

Code examples:

"rules": { "only-arrow-functions": true }

const myFunc = () => {
    // do something ...
};

const myFunc = function() {
    this.doSomething();
};

function myFunc() {
    // do something ...
};

const myFunc = function() {
    // do something ...
};