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- import {WordSeparators} from '../source/utilities';
-
- /**
- Recursively split a string literal into two parts on the first occurence of the given string, returning an array literal of all the separate parts.
- */
- export type Split<S extends string, D extends string> =
- string extends S ? string[] :
- S extends '' ? [] :
- S extends `${infer T}${D}${infer U}` ? [T, ...Split<U, D>] :
- [S];
-
- /**
- Step by step takes the first item in an array literal, formats it and adds it to a string literal, and then recursively appends the remainder.
-
- Only to be used by `CamelCaseStringArray<>`.
-
- @see CamelCaseStringArray
- */
- type InnerCamelCaseStringArray<Parts extends any[], PreviousPart> =
- Parts extends [`${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 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 {CamelCase} from 'type-fest';
-
- // Simple
-
- const someVariable: CamelCase<'foo-bar'> = 'fooBar';
-
- // Advanced
-
- type CamelCasedProps<T> = {
- [K in keyof T as CamelCase<K>]: T[K]
- };
-
- interface RawOptions {
- 'dry-run': boolean;
- 'full_family_name': string;
- foo: number;
- }
-
- const dbResult: CamelCasedProps<ModelProps> = {
- dryRun: true,
- fullFamilyName: 'bar.js',
- foo: 123
- };
- ```
- */
- export type CamelCase<K> = K extends string ? CamelCaseStringArray<Split<K, WordSeparators>> : K;
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