/**
 * Environment variable config parser
 */
import type { ToolFilterConfig } from '../types.js';
import type { RegexCompiler } from '../regex/regex-compiler.js';
/**
 * Parses tool filter configuration from environment variables
 */
export declare class EnvConfigParser {
    private compiler;
    constructor(compiler: RegexCompiler);
    /**
     * Parse config from environment variables
     * @returns Config or undefined if no env vars set
     */
    parse(env: NodeJS.ProcessEnv): ToolFilterConfig | undefined;
    /**
     * Extract raw config from env vars
     */
    private extractRawConfig;
    /**
     * Build typed config from raw config
     */
    private buildConfig;
    /**
     * Parse categories from string array
     */
    private parseCategories;
    /**
     * Parse CSV list from env var value
     */
    private parseCsvList;
    /**
     * Check if all arrays are empty
     */
    private isEmpty;
}
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