/**
 * Interpolates environment variables in a string using the format {{ process.env.VARIABLE_NAME }}.
 * Supports optional quoted default values applied when the variable is not set,
 * e.g. {{ process.env.VARIABLE_NAME || "default" }} (both `|` and `||` separators are accepted).
 *
 * @param value - The string containing environment variable templates to interpolate
 * @returns An object containing:
 *   - interpolatedValue: The string with all environment variables replaced with their values
 *   - unsetVars: Array of environment variable names that were not found and had no default
 *   - interpolatedVars: Array of environment variable names that were successfully resolved
 */
export declare function interpolateEnvVariables(value: string): {
    interpolatedValue: string;
    unsetVars: string[];
    interpolatedVars: string[];
};
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