[6a3a178] | 1 | import {WordSeparators} from '../source/utilities';
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| 2 | import {Split} from './utilities';
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| 3 |
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| 4 | /**
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| 5 | Step by step takes the first item in an array literal, formats it and adds it to a string literal, and then recursively appends the remainder.
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| 6 |
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| 7 | Only to be used by `CamelCaseStringArray<>`.
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| 8 |
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| 9 | @see CamelCaseStringArray
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| 10 | */
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| 11 | type InnerCamelCaseStringArray<Parts extends any[], PreviousPart> =
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| 12 | Parts extends [`${infer FirstPart}`, ...infer RemainingParts]
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| 13 | ? FirstPart extends undefined
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| 14 | ? ''
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| 15 | : FirstPart extends ''
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| 16 | ? InnerCamelCaseStringArray<RemainingParts, PreviousPart>
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| 17 | : `${PreviousPart extends '' ? FirstPart : Capitalize<FirstPart>}${InnerCamelCaseStringArray<RemainingParts, FirstPart>}`
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| 18 | : '';
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| 19 |
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| 20 | /**
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| 21 | Starts fusing the output of `Split<>`, an array literal of strings, into a camel-cased string literal.
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| 22 |
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| 23 | It's separate from `InnerCamelCaseStringArray<>` to keep a clean API outwards to the rest of the code.
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| 24 |
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| 25 | @see Split
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| 26 | */
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| 27 | type CamelCaseStringArray<Parts extends string[]> =
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| 28 | Parts extends [`${infer FirstPart}`, ...infer RemainingParts]
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| 29 | ? Uncapitalize<`${FirstPart}${InnerCamelCaseStringArray<RemainingParts, FirstPart>}`>
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| 30 | : never;
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| 31 |
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| 32 | /**
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| 33 | Convert a string literal to camel-case.
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| 34 |
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| 35 | This can be useful when, for example, converting some kebab-cased command-line flags or a snake-cased database result.
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| 36 |
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| 37 | @example
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| 38 | ```
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| 39 | import {CamelCase} from 'type-fest';
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| 40 |
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| 41 | // Simple
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| 42 |
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| 43 | const someVariable: CamelCase<'foo-bar'> = 'fooBar';
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| 44 |
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| 45 | // Advanced
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| 46 |
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| 47 | type CamelCasedProps<T> = {
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| 48 | [K in keyof T as CamelCase<K>]: T[K]
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| 49 | };
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| 50 |
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| 51 | interface RawOptions {
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| 52 | 'dry-run': boolean;
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| 53 | 'full_family_name': string;
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| 54 | foo: number;
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| 55 | }
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| 56 |
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| 57 | const dbResult: CamelCasedProps<ModelProps> = {
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| 58 | dryRun: true,
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| 59 | fullFamilyName: 'bar.js',
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| 60 | foo: 123
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| 61 | };
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| 62 | ```
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| 63 | */
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| 64 | export type CamelCase<K> = K extends string ? CamelCaseStringArray<Split<K, WordSeparators>> : K;
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