import type { LanguageAdapter } from './adapter.js';
/** Per-run registry of language adapters, indexed by id and file extension. */
export declare class LanguageRegistry {
    private readonly inner;
    private readonly byExtension;
    /**
     * Alias → canonical id index. Populated alongside the inner registry
     * during `register`. Lets `canonicalize` map an alias like `'c'` or
     * `'rs'` back to the registered adapter id (`'cpp'`, `'rust'`).
     */
    private readonly aliasIndex;
    register(adapter: LanguageAdapter): void;
    private indexExtensions;
    private indexAliases;
    get(id: string): LanguageAdapter | undefined;
    forFile(filePath: string): LanguageAdapter | undefined;
    /**
     * Resolve a language id or alias to its canonical adapter id.
     *
     * - For a registered canonical id (e.g. `'cpp'`), returns the same id.
     * - For a registered alias (e.g. `'c'`, `'rs'`, `'golang'`, `'py'`),
     *   returns the canonical id (`'cpp'`, `'rust'`, `'go'`, `'python'`).
     * - Returns `undefined` for unknown languages.
     *
     * Use this anywhere two pieces of code compare language strings —
     * scope-matching, target-language sets — so a config written with
     * `languages: ['c']` matches a check scoped to `cpp`.
     */
    canonicalize(idOrAlias: string): string | undefined;
    list(): readonly LanguageAdapter[];
    has(id: string): boolean;
    get size(): number;
    clear(): void;
}
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