/**
 * 企业微信处理器工具函数
 *
 * 从 wecom.ts 提取的模块级纯函数。
 */
import type { PermissionDecision } from './wecom-types.js';
export declare function extractExtension(name: string): string;
export declare function normalizeExtension(ext: string): string;
export declare function extensionFromContentType(contentType: string): string;
export declare function mimeFromExtension(ext: string): string;
export declare function sanitizeFilename(name: string): string;
export declare function extractFilenameFromUrl(url: string): string;
export declare function parsePermissionDecision(raw: string): PermissionDecision | null;
//# sourceMappingURL=wecom-utils.d.ts.map