/**
 * Language-aware normalization router.
 *
 * Detects the source language from a file extension and dispatches to the
 * appropriate tree-sitter normalizer.  All normalizers share the same Sigma
 * IR alphabet so the resulting PDG is directly comparable regardless of the
 * source language.
 *
 * Supported extensions:
 *   .go           → normalizeGo      (tree-sitter-go)
 *   .rs           → normalizeRust    (tree-sitter-rust)
 *   .ts .tsx .js  → normalizeTypescript (tree-sitter-typescript)
 *   .jsx (default)→ normalizeTypescript
 */
import { PDG } from './pdg.js';
import { Sigma } from './sigma.js';
export type SupportedLanguage = 'typescript' | 'go' | 'rust';
/**
 * Resolve a SupportedLanguage from a file path or bare extension string.
 * Returns `'typescript'` as the safe default for unknown extensions.
 */
export declare function languageFromExtension(filePathOrExt: string): SupportedLanguage;
/**
 * Normalize `source` code to a PDG using the normalizer that corresponds to
 * the given file extension.
 *
 * @param source       - Raw source code string.
 * @param filePathOrExt - File path (e.g. `"cmd/main.go"`) or bare extension
 *                        (e.g. `".go"`).  Used only for language detection.
 * @param sigma        - Optional pre-loaded Sigma alphabet.  If omitted, the
 *                       default sigma.json is loaded automatically.
 */
export declare function normalizeByExtension(source: string, filePathOrExt: string, sigma?: Sigma): PDG;
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