import type { Combinator } from '../types.ts';
/**
 * ASCII case-fold equality — the interpreter twin of the compiler's `foldEq`
 * (and `/i`-flag regex lowering). Folds ASCII letters via bit 0x20, exact-matches
 * everything else. Deliberately NOT `Intl.Collator` (measured ~9× slower, and its
 * Unicode accent-folding is the wrong semantic for a parser). Keeps interpreter /
 * compiled / macro output identical for case-insensitive `literal()`.
 */
export declare function asciiFoldEq(a: string, b: string): boolean;
export type LiteralOptions = {
    caseInsensitive?: boolean;
};
export declare function literal(value: string, opts?: LiteralOptions): Combinator<string>;
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