eslint/no-inner-declarations Pedantic
What it does
Disallow variable or function declarations in nested blocks
Why is this bad?
A variable declaration is permitted anywhere a statement can go, even nested deeply inside other blocks. This is often undesirable due to variable hoisting, and moving declarations to the root of the program or function body can increase clarity. Note that block bindings (let, const) are not hoisted and therefore they are not affected by this rule.
Examples
Examples of incorrect code for this rule:
javascript
if (test) {
function doSomethingElse() {}
}Examples of correct code for this rule:
javascript
function doSomethingElse() {}
if (test) {
// your code here
}Configuration
This rule accepts a configuration object with the following properties:
blockScopedFunctions
type: "allow" | "disallow"
default: null
Controls whether function declarations in nested blocks are allowed in strict mode (ES6+ behavior).
"allow"
Allow function declarations in nested blocks in strict mode (ES6+ behavior).
"disallow"
Disallow function declarations in nested blocks regardless of strict mode.
config
type: "functions" | "both"
default: "functions"
Determines what type of declarations to check.
"functions"
Disallows function declarations in nested blocks.
"both"
Disallows function and var declarations in nested blocks.
How to use
To enable this rule in the CLI or using the config file, you can use:
bash
oxlint --deny no-inner-declarationsjson
{
"rules": {
"no-inner-declarations": "error"
}
}