/**
 * The characters VelarScript refuses to read directly: the twelve
 * `Bidi_Control` code points that can reorder a reviewer's line, and the C0/C1
 * controls that have to be written as a visible escape. Also the one report an
 * unsupported character run earns.
 *
 * D115 §三 / D114 R1f: the hygiene half of `lexer.ts`.
 */
import { type Diagnostic } from "../diagnostic.ts";
/** Everything this half of the lexer asks of the scanner that hosts it, and nothing more. */
export interface SourceHygieneHost {
    readonly diagnosedBidirectionalOffsets: Set<number>;
    readonly diagnostics: {
        push(...reports: readonly Diagnostic[]): void;
    };
    index: number;
    isAtEnd(): boolean;
    readonly text: string;
}
export declare class SourceHygiene {
    private readonly host;
    constructor(host: SourceHygieneHost);
    diagnoseForbiddenSourceCharacters(): void;
    isBidirectionalControl(codePoint: number): boolean;
    isForbiddenLiteralControl(codePoint: number): boolean;
    invalidCharacter(character: string, start: number): void;
}
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