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import type {WordSeparators} from '../source/internal'; import type {Split} from './split'; /** 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. Only to be used by `CamelCaseStringArray<>`. @see CamelCaseStringArray */ type InnerCamelCaseStringArray<Parts extends readonly any[], PreviousPart> = Parts extends [`${infer FirstPart}`, ...infer RemainingParts] ? FirstPart extends undefined ? '' : FirstPart extends '' ? InnerCamelCaseStringArray<RemainingParts, PreviousPart> : `${PreviousPart extends '' ? FirstPart : Capitalize<FirstPart>}${InnerCamelCaseStringArray<RemainingParts, FirstPart>}` : ''; /** Starts fusing the output of `Split<>`, an array literal of strings, into a camel-cased string literal. It's separate from `InnerCamelCaseStringArray<>` to keep a clean API outwards to the rest of the code. @see Split */ type CamelCaseStringArray<Parts extends readonly string[]> = Parts extends [`${infer FirstPart}`, ...infer RemainingParts] ? Uncapitalize<`${FirstPart}${InnerCamelCaseStringArray<RemainingParts, FirstPart>}`> : never; /** Convert a string literal to camel-case. This can be useful when, for example, converting some kebab-cased command-line flags or a snake-cased database result. @example ``` import type {CamelCase} from 'type-fest'; // Simple const someVariable: CamelCase<'foo-bar'> = 'fooBar'; // Advanced type CamelCasedProperties<T> = { [K in keyof T as CamelCase<K>]: T[K] }; interface RawOptions { 'dry-run': boolean; 'full_family_name': string; foo: number; BAR: string; QUZ_QUX: number; 'OTHER-FIELD': boolean; } const dbResult: CamelCasedProperties<RawOptions> = { dryRun: true, fullFamilyName: 'bar.js', foo: 123, bar: 'foo', quzQux: 6, otherField: false }; ``` @category Change case @category Template literal */ export type CamelCase<K> = K extends string ? CamelCaseStringArray<Split<K extends Uppercase<K> ? Lowercase<K> : K, WordSeparators>> : K;
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33 entries across 33 versions & 1 rubygems