no-func-assign

NOTE: this rule is part of the recommended rule set.

Enable full set in deno.json:

{
  "lint": {
    "rules": {
      "tags": ["recommended"]
    }
  }
}

Enable full set using the Deno CLI:

deno lint --rules-tags=recommended

This rule can be explictly included to or excluded from the rules present in the current tag by adding it to the include or exclude array in deno.json:

{
  "lint": {
    "rules": {
      "include": ["no-func-assign"],
      "exclude": ["no-func-assign"]
    }
  }
}

Disallows the overwriting/reassignment of an existing function.

Javascript allows for the reassignment of a function definition. This is generally a mistake on the developers part, or poor coding practice as code readability and maintainability will suffer.

Invalid:

function foo() {}
foo = bar;

const a = function baz() {
  baz = "now I'm a string";
};

myFunc = existingFunc;
function myFunc() {}

Valid:

function foo() {}
const someVar = foo;

const a = function baz() {
  const someStr = "now I'm a string";
};

const anotherFuncRef = existingFunc;

let myFuncVar = function () {};
myFuncVar = bar; // variable reassignment, not function re-declaration

no-func-assign

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