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import {WordSeparators} from '../source/utilities';
import {Split} from './utilities';
/**
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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