/**
 * Uppercase the first letter of the string, and any letter following a `/`.
 *
 * Drop-in replacement for `capitalize` from `@ember/string`, so we don't
 * pull that package in as a runtime/peer dependency just to title-case a
 * handful of event keys.
 *
 * @param str The string to capitalize.
 * @returns The capitalized string.
 */
export default function capitalize(str: string): string;
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