Disallow unnecessary nested blocks
In JavaScript, prior to ES6, standalone code blocks delimited by curly braces do not create a new scope and have no use. For example, these curly braces do nothing to foo
:
In ES6, code blocks may create a new scope if a block-level binding (let
and const
), a class declaration or a function declaration (in strict mode) are present. A block is not considered redundant in these cases.
This rule aims to eliminate unnecessary and potentially confusing blocks at the top level of a script or within other blocks.
Examples of incorrect code for this rule:
Examples of correct code for this rule with ES6 environment:
Examples of correct code for this rule with ES6 environment and strict mode via "parserOptions": { "sourceType": "module" }
in the ESLint configuration or "use strict"
directive in the code:
This rule was introduced in ESLint v0.4.0.
© OpenJS Foundation and other contributors
Licensed under the MIT License.
https://eslint.org/docs/latest/rules/no-lone-blocks