/** Quote characters recognised as string delimiters. */
export type QuoteChar = '"' | "'" | "`";
export interface StringAwareScannerOptions {
    /** Which characters open/close a string literal. */
    quoteChars: readonly QuoteChar[];
    /**
     * Quote chars for which backslash-escape processing applies.
     * Typically just `'"'`; backtick raw strings and single-quoted TOML
     * strings never treat `\\` as an escape sequence.
     */
    escapedQuotes?: readonly QuoteChar[];
}
/**
 * Scans `input` character-by-character while tracking string-literal state.
 *
 * Calls:
 * - `callbacks.onUnquoted(char, index)` for every character that is NOT inside
 *   a string literal.  Returning `false` stops the scan early.
 * - `callbacks.onQuoteOpen(quoteChar, index)` when a string literal opens
 *   (called with the opening quote character and its position).
 * - `callbacks.onQuoteClose(quoteChar, index)` when a string literal closes
 *   (called with the closing quote character and its position).
 *
 * The quote-open and quote-close characters themselves are NOT passed to
 * `onUnquoted` — only truly unquoted content reaches that callback.
 */
export declare function scanStringAware(input: string, options: StringAwareScannerOptions, callbacks: {
    onUnquoted?: (char: string, index: number) => boolean | void;
    onQuoteOpen?: (quoteChar: QuoteChar, index: number) => void;
    onQuoteClose?: (quoteChar: QuoteChar, index: number) => void;
}): void;
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