JS.TS.PREFER.AS.CONST
Prefer usage of 'as const' over literal type
This rule recommends usage of const assertion when type primitive value is equal to type.
Rule Details
Examples of code for this rule:
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Incorrect
Copy
let bar: 2 = 2;
let foo = <'bar'>'bar';
let foo = { bar: 'baz' as 'baz' };
Correct
Copy
let foo = 'bar';
let foo = 'bar' as const;
let foo: 'bar' = 'bar' as const;
let bar = 'bar' as string;
let foo = <string>'bar';
let foo = { bar: 'baz' };
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Options
Copy
// .eslintrc.json
{
"rules": {
"@typescript-eslint/prefer-as-const": "error"
}
}
This rule is not configurable.
When Not To Use It
If you are using TypeScript < 3.4
