All files / string constant-case.ts

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import { splitWords } from './split-words';
 
/**
 * Converts a string to CONSTANT_CASE: uppercase words joined with `_`, as in constants and environment
 * variables.
 *
 * @param input - The identifier or sentence to convert, in any case style.
 * @returns The CONSTANT_CASE string; `''` when the input has no word.
 * @example
 * constantCase('maxChannel'); // 'MAX_CHANNEL'
 * constantCase('api-base-url'); // 'API_BASE_URL'
 */
export function constantCase(input: string): string {
  return splitWords(input)
    .map((word) => word.toUpperCase())
    .join('_');
}