/**
 * Replace {{key}} placeholders in a template string with values from a map.
 * @param input The template string containing {{key}} placeholders.
 * @param variables A map of placeholder keys to values.
 * @returns The rendered string with placeholders replaced.
 * @remarks Keys are trimmed inside braces. Missing values (undefined) become an empty string.
 */
export declare function template(input: string, variables: Record<string, any>): string;
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