/**
 * AST-based impure pattern detection for pure annotation gating.
 * Uses tree-sitter to detect structural impurity patterns rather than regex.
 */
/**
 * Detect impure patterns in source code using AST analysis.
 * Returns a list of reasons why the code is impure (empty = possibly pure).
 *
 * @param sourceCode - The source code to analyze
 * @param language - Optional language hint ('ruby', 'typescript', 'javascript', etc.)
 *                   Defaults to TypeScript/JavaScript analysis for backward compatibility.
 *                   Unknown languages return 'needs manual review'.
 */
export declare function detectImpurePatterns(sourceCode: string, language?: string): string[];
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