/**
 * Uppercase the first character of a string, leaving the rest untouched.
 *
 * Used to build per-property lifecycle hook names (e.g. `updating` +
 * `ucfirst('userEmail')` -> `updatingUserEmail`). Deliberately simpler than
 * `@adonisjs/core/helpers/string`'s `titleCase()`, which is word-boundary
 * aware and leaves an already-camelCase input like `userEmail` untouched —
 * that mismatch used to make per-property hooks on multi-word properties
 * silently never fire.
 */
export declare function ucfirst(str: string): string;