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1 | import {DelimiterCase} from './delimiter-case';
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2 |
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3 | /**
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4 | Convert a string literal to snake-case.
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5 |
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6 | This can be useful when, for example, converting a camel-cased object property to a snake-cased SQL column name.
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7 |
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8 | @example
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9 | ```
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10 | import {SnakeCase} from 'type-fest';
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11 |
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12 | // Simple
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13 |
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14 | const someVariable: SnakeCase<'fooBar'> = 'foo_bar';
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15 |
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16 | // Advanced
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17 |
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18 | type SnakeCasedProps<T> = {
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19 | [K in keyof T as SnakeCase<K>]: T[K]
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20 | };
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21 |
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22 | interface ModelProps {
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23 | isHappy: boolean;
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24 | fullFamilyName: string;
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25 | foo: number;
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26 | }
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27 |
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28 | const dbResult: SnakeCasedProps<ModelProps> = {
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29 | 'is_happy': true,
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30 | 'full_family_name': 'Carla Smith',
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31 | foo: 123
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32 | };
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33 | ```
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34 | */
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35 | export type SnakeCase<Value> = DelimiterCase<Value, '_'>;
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