/**
 * Extracts a boolean flag from the unparsed args array.
 *
 * Handles three forms:
 *   --flag          → true
 *   --flag true     → true
 *   --flag false    → false
 *
 * Mutates the unparsed array by removing the matched entries.
 * Returns the resolved boolean value, or undefined if the flag was not found.
 */
export declare function extractBooleanFlag(unparsed: string[], flag: string): boolean | undefined;
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