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# Disallow Magic Numbers (@typescript-eslint/no-magic-numbers) | ||
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'Magic numbers' are numbers that occur multiple times in code without an explicit meaning. | ||
They should preferably be replaced by named constants. | ||
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## Rule Details | ||
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The `@typescript-eslint/no-magic-numbers` rule extends the `no-magic-numbers` rule from ESLint core, and adds support for handling Typescript specific code that would otherwise trigger the rule. | ||
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See the [ESLint documentation](https://eslint.org/docs/rules/no-magic-numbers) for more details on the `no-magic-numbers` rule. | ||
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## Rule Changes | ||
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```cjson | ||
{ | ||
// note you must disable the base rule as it can report incorrect errors | ||
"no-magic-numbers": "off", | ||
"@typescript-eslint/no-magic-numbers": ["error", { "ignoreNumericLiteralTypes": true }] | ||
} | ||
``` | ||
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In addition to the options supported by the `no-magic-numbers` rule in ESLint core, the rule adds the following options: | ||
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### ignoreNumericLiteralTypes | ||
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A boolean to specify if numbers used in Typescript numeric literal types are considered okay. `false` by default. | ||
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Examples of **incorrect** code for the `{ "ignoreNumericLiteralTypes": false }` option: | ||
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```ts | ||
/*eslint @typescript-eslint/no-magic-numbers: ["error", { "ignoreNumericLiteralTypes": false }]*/ | ||
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type SmallPrimes = 2 | 3 | 5 | 7 | 11; | ||
``` | ||
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Examples of **correct** code for the `{ "ignoreNumericLiteralTypes": true }` option: | ||
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```ts | ||
/*eslint @typescript-eslint/no-magic-numbers: ["error", { "ignoreNumericLiteralTypes": true }]*/ | ||
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type SmallPrimes = 2 | 3 | 5 | 7 | 11; | ||
``` | ||
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<sup>Taken with ❤️ [from ESLint core](https://github.com/eslint/eslint/blob/master/docs/rules/no-magic-numbers.md)</sup> |
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