# no-inner-declarations
Disallow variable and function declarations in nested blocks.
Prior to ECMAScript 6, function declarations were only allowed in the first level of a program or the body of another function, although parsers sometimes incorrectly accept it. This rule only applies to function declarations, not function expressions.
# Invalid Code Examples
function foo() {
if (bar) {
// Move this to foo's body, outside the if statement
function bar() {}
}
}
if (bar) {
var foo = 5;
}
# Correct Code Examples
function foo() {}
var bar = 5;
# Config
| Name | Type | Description |
|---|---|---|
disallowed | Vec < String > | What declarations to disallow in nested blocks, it can include two possible options: "functions" and "variables", you can include either or, or both. Disallows only functions by default. |
More incorrect examples
if (test) { function doSomething() { } }
if (foo) function f(){}
function bar() { if (foo) function f(){}; }
function doSomething() { do { function somethingElse() { } } while (test); }
(function() { if (test) { function doSomething() { } } }());
if (foo){ function f(){ if(bar){ var a; } } }
if (foo) function f(){ if(bar) var a; }
More correct examples
function doSomething() { }
if (test) { let x = 1; }
if (test) { const x = 1; }
export const foo = [];
export function bar() {}