/**
 * Cutting a condition into tokens, in CEL's lexical rules and no further.
 *
 * Everything refused here is refused because CEL would read it differently or
 * because the subset leaves it out, and the message says which: a node id with
 * a dash is subtraction in CEL, so it is refused where it is written rather
 * than read as arithmetic a real CEL library would evaluate.
 */
/** One token, with where it sits in the source so a message can quote it. */
export type Token = {
    readonly kind: "name" | "number" | "string" | "op" | "end";
    readonly text: string;
    /** A number's or a string's value, unescaped. */
    readonly value?: number | string;
    readonly start: number;
    readonly end: number;
};
/** A condition that is not in the language. Thrown inside the module, returned as a problem at its door. */
export declare class SyntaxFault extends Error {
}
/** Whether a word can name something a condition reads. */
export declare function isReserved(word: string): boolean;
/** The tokens of `source`, ending with one `end` token. Throws `SyntaxFault`. */
export declare function tokenize(source: string): Token[];
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