/**
 * Environment Variable Extractor
 *
 * Detects env vars used in a project from two complementary sources:
 *   1. Declaration files — .env.example, .env.local, .env (with optional comments)
 *   2. Source code — process.env.X (JS/TS), os.environ["X"] (Python),
 *      os.Getenv("X") (Go), ENV["X"] (Ruby)
 *
 * Variables found in declaration files are marked hasDefault=true when the
 * declaration line has a non-empty value. Variables found only in source code
 * are marked required=true (no known default).
 */
export interface EnvVar {
    /** Environment variable name, e.g. DATABASE_URL */
    name: string;
    /** Relative path(s) where the variable was found */
    files: string[];
    /** True when declared in .env.example with a non-empty value */
    hasDefault: boolean;
    /** True when used in source code without a fallback (process.env.X without ?? or ||) */
    required: boolean;
    /** Inline comment from .env.example, if present */
    description?: string;
}
/**
 * Extract all environment variables referenced or declared in the project.
 */
export declare function extractEnvVars(filePaths: string[], rootDir: string): Promise<EnvVar[]>;
/**
 * Return a compact summary string for LLM prompts.
 */
export declare function summarizeEnvVars(vars: EnvVar[]): string;
/**
 * One environment-variable READ in source, located to a line, with a per-site
 * fallback verdict. The read-site refinement of {@link extractFromSource}: same
 * per-language patterns, but it keeps WHERE each read is and whether THAT site
 * has an immediate fallback — the input `analyze_env_impact` needs to map a read
 * to its enclosing function and classify the break as hard vs. soft.
 */
export interface EnvReadSite {
    /** Environment variable name, e.g. DATABASE_URL */
    name: string;
    /** Repo-relative path of the file the read is in */
    file: string;
    /** 1-based line of the read */
    line: number;
    /**
     * True when no immediate fallback was detected AT THIS site (a hard break if
     * the var is removed). A fallback elsewhere does not clear it — per-site only.
     * A documented heuristic, not a guarantee.
     */
    required: boolean;
}
/**
 * Extract every environment-variable READ site in one file, line-precise, reusing
 * the existing per-language patterns (no new grammar). Returns [] for a file in a
 * language the patterns do not cover — an honest absence, never a guessed read.
 * Deterministic: stable order (line, then name).
 */
export declare function extractEnvReadSites(source: string, relPath: string, ext: string): EnvReadSite[];
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