/**
 * Checked design-token references (D103): what a token name is, what it lowers
 * to, and how a written `var(--name)` is read back.
 */
/**
 * A CSS custom property identifier, as a Look token name. `--` and at least one
 * more character, from the ASCII ident set a design system's tokens are written
 * with. CSS itself also admits non-ASCII ident code points and backslash
 * escapes; both are outside this set on purpose, because the text goes straight
 * into a compiler-owned stylesheet where an escape is a way out of the
 * declaration (the same reasoning LOK-U9 applies to `keyframes:` values).
 */
export declare const LOOK_TOKEN_NAME_PATTERN: RegExp;
/** The whole rule, in the terms a diagnostic teaches it. */
export declare const LOOK_TOKEN_NAME_RULE = "a design token name is a literal string holding a CSS custom property identifier: '--' followed by one or more letters, digits, hyphens, or underscores";
/**
 * D103 rule 5 — why there is no second parameter. A design token is the design
 * system's closed contract; a token that is missing is a defect in that system,
 * to be fixed once where it is defined, rather than a decision each of hundreds
 * of use sites re-makes for itself. A per-site fallback would also be the one
 * part of the reference the compiler could neither see nor check.
 */
export declare const LOOK_TOKEN_NO_FALLBACK_GUIDANCE = "token(name) takes the token name and nothing else: a design token is the design system's closed contract, so a token that is missing is a defect to fix where the token is defined rather than a fallback decided again at every use site";
export declare function isLookTokenName(name: string): boolean;
/** The CSS text a checked token reference lowers to. */
export declare function lookTokenReference(name: string): string;
/**
 * The token name a whole `var(--name)` string names, or null. Only the complete
 * value is read: `var()` inside a larger value — the tail of a font stack, one
 * layer of a filter — is a legitimate free-text spelling with no single token
 * to rewrite it to, so it is not this function's business. A `var(--x, red)`
 * fallback form answers null here and is diagnosed by its own message, because
 * the closed contract above has no fallback to migrate it to.
 */
export declare function lookVarReferenceName(text: string): string | null;
/** Whether a whole string is a `var(...)` reference of any shape, fallback included. */
export declare function isLookVarReference(text: string): boolean;
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