export interface StringLiteralSyntax {
    readonly prefix: "" | "f" | "r" | "rf" | "fr";
    readonly prefixLength: number;
    readonly quote: "\"" | "'" | "`";
    readonly raw: boolean;
    readonly interpolated: boolean;
    readonly canonical: boolean;
}
export interface StringLiteralScan extends StringLiteralSyntax {
    readonly contentStart: number;
    readonly contentEnd: number;
    readonly content: string;
    readonly contentOffsets?: readonly number[];
    readonly end: number;
    readonly closed: boolean;
    readonly layout: boolean;
    readonly recoverAtLineStart: boolean;
    readonly indentationError?: {
        readonly start: number;
        readonly end: number;
    };
}
export interface StringTokenPayload {
    readonly prefixLength: number;
    readonly quote: "\"" | "'" | "`";
    readonly raw: boolean;
    readonly layout: boolean;
    readonly contentOffsets?: readonly number[];
}
export declare function stringLiteralSyntax(source: string, start: number): StringLiteralSyntax | null;
export declare function scanStringLiteral(source: string, start: number): StringLiteralScan | null;
export declare function findInterpolatedExpressionEnd(source: string, start: number, end?: number): number;
export type StringEscapeError = "legacyUnicode" | "hex" | "unicodeForm" | "unicodeRange" | "unicodeSurrogate" | "unknown";
export interface StringEscapeScan {
    readonly end: number;
    readonly value: string | null;
    readonly error: StringEscapeError | null;
}
/**
 * Scans one non-raw string escape beginning at `start`. Keeping this owner in
 * the shared string scanner makes delimiter discovery, Lexer diagnostics,
 * f-string decoding, and formatter quote normalization agree on the exact
 * escape boundary — especially for `\\u{...}`, whose braces are text rather
 * than interpolation syntax.
 */
export declare function scanStringEscape(source: string, start: number, endLimit?: number): StringEscapeScan;
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