58 lines
2.4 KiB
TypeScript
58 lines
2.4 KiB
TypeScript
type SnakeToCamel<S extends string> = S extends `${infer H}_${infer T}` ? `${Lowercase<H>}${Capitalize<SnakeToCamel<T>>}` : Lowercase<S>;
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type PascalToCamel<S extends string> = S extends `${infer F}${infer R}` ? `${Lowercase<F>}${R}` : S;
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/** If it's snake_case, apply the snake_case rule; otherwise, just lowercase the first letter (including PascalCase → camelCase). */
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type AnyToCamel<S extends string> = S extends `${string}_${string}` ? SnakeToCamel<S> : PascalToCamel<S>;
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type NonPlainObject = Date | RegExp | Map<any, any> | Set<any> | WeakMap<any, any> | WeakSet<any> | Promise<any> | Error | ArrayBuffer | DataView | Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array | BigInt64Array | BigUint64Array | ((...args: any[]) => any) | typeof globalThis;
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type ToCamelCaseKeys<T> = T extends NonPlainObject ? T : T extends any[] ? Array<ToCamelCaseKeys<T[number]>> : T extends Record<string, any> ? {
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[K in keyof T as AnyToCamel<Extract<K, string>>]: ToCamelCaseKeys<T[K]>;
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} : T;
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/**
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* Creates a new object composed of the properties with keys converted to camelCase.
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*
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* This function takes an object and returns a new object that includes the same properties,
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* but with all keys converted to camelCase format.
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*
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* @template T - The type of object.
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* @param {T} obj - The object to convert keys from.
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* @returns {ToCamelCaseKeys<T>} A new object with all keys converted to camelCase.
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*
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* @example
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* // Example with objects
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* const obj = { user_id: 1, first_name: 'John' };
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* const result = toCamelCaseKeys(obj);
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* // result will be { userId: 1, firstName: 'John' }
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*
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* // Example with arrays of objects
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* const arr = [
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* { user_id: 1, first_name: 'John' },
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* { user_id: 2, first_name: 'Jane' }
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* ];
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* const arrResult = toCamelCaseKeys(arr);
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* // arrResult will be [{ userId: 1, firstName: 'John' }, { userId: 2, firstName: 'Jane' }]
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*
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* // Example with nested objects
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* const nested = {
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* user_data: {
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* user_id: 1,
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* user_address: {
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* street_name: 'Main St',
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* zip_code: '12345'
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* }
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* }
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* };
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* const nestedResult = toCamelCaseKeys(nested);
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* // nestedResult will be:
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* // {
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* // userData: {
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* // userId: 1,
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* // userAddress: {
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* // streetName: 'Main St',
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* // zipCode: '12345'
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* // }
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* // }
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* // }
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*/
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declare function toCamelCaseKeys<T>(obj: T): ToCamelCaseKeys<T>;
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export { toCamelCaseKeys };
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