export type Piece = {
    kind: 'token';
    value: string;
} | {
    kind: 'literal';
    value: string;
};
export interface SpannedPiece {
    kind: 'token' | 'literal';
    value: string;
    start: number;
    end: number;
}
/**
 * Splits a format string like `"yyyy-MM-dd 'at' HH:mm"` into token/literal
 * pieces, each with its exact source span. Text in single quotes is always
 * literal (e.g. write 'rd' in "3rd" so it's not read as the day token). A
 * doubled quote ('') means a literal quote character, both inside a quoted
 * span and standalone.
 */
export declare function tokenizeWithSpans(format: string): SpannedPiece[];
/**
 * Splits a format string like `"yyyy-MM-dd 'at' HH:mm"` into token/literal
 * pieces. Text in single quotes is always literal (e.g. write 'rd' in
 * "3rd" so it's not read as the day token). A doubled quote ('') means a
 * literal quote character, both inside a quoted span and standalone.
 */
export declare function tokenize(format: string): Piece[];