noUselessLoneBlockStatements
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Summary
Section titled “Summary”- Rule available since:
v1.3.3 - Diagnostic Category:
lint/complexity/noUselessLoneBlockStatements - This rule is recommended, which means is enabled by default.
- This rule has a safe fix.
- The default severity of this rule is information.
- Sources:
- Same as
no-lone-blocks
- Same as
Description
Section titled “Description”Disallow unnecessary nested block statements.
In JavaScript, prior to ES6, standalone code blocks delimited by curly braces do not create a new scope and have no use. 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.
Examples
Section titled “Examples”Invalid
Section titled “Invalid”{}code-block.js:1:1 lint/complexity/noUselessLoneBlockStatements ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ This block statement doesn’t serve any purpose and can be safely removed.
> 1 │ {}
│ ^^
2 │
ℹ Standalone block statements without any block-level declarations are redundant in JavaScript and can be removed to simplify the code.
if (foo) { bar(); { baz(); }}code-block.js:3:3 lint/complexity/noUselessLoneBlockStatements FIXABLE ━━━━━━━━━━━━━━━━━━━━━━━━━━━
ℹ This block statement doesn’t serve any purpose and can be safely removed.
1 │ if (foo) {
2 │ bar();
> 3 │ {
│ ^
> 4 │ baz();
> 5 │ }
│ ^
6 │ }
7 │
ℹ Standalone block statements without any block-level declarations are redundant in JavaScript and can be removed to simplify the code.
ℹ Safe fix: Remove redundant block.
1 1 │ if (foo) {
2 2 │ bar();
3 │ - ··{
4 3 │ baz();
5 │ - ··}
6 4 │ }
7 5 │
while (foo) { bar();}How to configure
Section titled “How to configure”{ "linter": { "rules": { "complexity": { "noUselessLoneBlockStatements": "error" } } }}