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eb39fafa4f
includes a (minimal) working wrapper Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
69 lines
1.3 KiB
Markdown
69 lines
1.3 KiB
Markdown
# Disallow modifying variables that are declared using `const` (no-const-assign)
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We cannot modify variables that are declared using `const` keyword.
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It will raise a runtime error.
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Under non ES2015 environment, it might be ignored merely.
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## Rule Details
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This rule is aimed to flag modifying variables that are declared using `const` keyword.
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Examples of **incorrect** code for this rule:
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```js
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/*eslint no-const-assign: "error"*/
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/*eslint-env es6*/
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const a = 0;
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a = 1;
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```
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```js
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/*eslint no-const-assign: "error"*/
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/*eslint-env es6*/
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const a = 0;
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a += 1;
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```
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```js
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/*eslint no-const-assign: "error"*/
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/*eslint-env es6*/
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const a = 0;
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++a;
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```
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Examples of **correct** code for this rule:
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```js
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/*eslint no-const-assign: "error"*/
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/*eslint-env es6*/
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const a = 0;
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console.log(a);
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```
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```js
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/*eslint no-const-assign: "error"*/
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/*eslint-env es6*/
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for (const a in [1, 2, 3]) { // `a` is re-defined (not modified) on each loop step.
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console.log(a);
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}
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```
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```js
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/*eslint no-const-assign: "error"*/
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/*eslint-env es6*/
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for (const a of [1, 2, 3]) { // `a` is re-defined (not modified) on each loop step.
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console.log(a);
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}
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```
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## When Not To Use It
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If you don't want to be notified about modifying variables that are declared using `const` keyword, you can safely disable this rule.
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