eslint/no-redeclare Pedantic
What it does
This rule disallows redeclaring variables within the same scope, ensuring that each variable is declared only once. It helps avoid confusion and unintended behavior in code.
Why is this bad?
Redeclaring variables in the same scope can lead to unexpected behavior, overwriting existing values, and making the code harder to understand and maintain.
Examples
Examples of incorrect code for this rule:
javascript
var a = 3;
var a = 10;Examples of correct code for this rule:
javascript
var a = 3;
a = 10;Configuration
This rule accepts a configuration object with the following properties:
builtinGlobals
type: boolean
default: true
When set true, it flags redeclaring built-in globals (e.g., let Object = 1;).
How to use
To enable this rule using the config file or in the CLI, you can use:
json
{
"rules": {
"no-redeclare": "error"
}
}bash
oxlint --deny no-redeclare