transformCamelKebabCase

1/**
2 * Converts between camelCase and kebab-case formats.
3 *
4 * @param str - The input string.
5 * @param direction - Direction of transformation: 'camelToKebab' or 'kebabToCamel'.
6 * @returns Transformed string in the desired format.
7 */
8export function transformCamelKebabCase(
9  str: string,
10  direction: 'camelToKebab' | 'kebabToCamel'
11): string {
12  if (direction === 'camelToKebab') {
13    return str.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase();
14  }
15
16  if (direction === 'kebabToCamel') {
17    return str.replace(/-([a-z])/g, (_, char) => char.toUpperCase());
18  }
19
20  throw new Error('Invalid direction: use "camelToKebab" or "kebabToCamel"');
21}

1test('transformCamelKebabCase - camel to kebab', () => {
2  expect(transformCamelKebabCase('myVariableName', 'camelToKebab')).toBe('my-variable-name');
3});
4
5test('transformCamelKebabCase - kebab to camel', () => {
6  expect(transformCamelKebabCase('my-variable-name', 'kebabToCamel')).toBe('myVariableName');
7});
8
9test('transformCamelKebabCase - empty string', () => {
10  expect(transformCamelKebabCase('', 'camelToKebab')).toBe('');
11  expect(transformCamelKebabCase('', 'kebabToCamel')).toBe('');
12});
13
14test('transformCamelKebabCase - kebab with leading dash', () => {
15  expect(transformCamelKebabCase('-foo-bar', 'kebabToCamel')).toBe('FooBar');
16});
17
18test('transformCamelKebabCase - camel with no caps', () => {
19  expect(transformCamelKebabCase('plain', 'camelToKebab')).toBe('plain');
20});
21
22test('transformCamelKebabCase - invalid direction throws', () => {
23  expect(() => transformCamelKebabCase('test', 'unknown' as any)).toThrow(
24    'Invalid direction: use "camelToKebab" or "kebabToCamel"'
25  );
26});