/**
 * The CSS named-colour table.
 *
 * A static table rather than a `getComputedStyle` probe, for three reasons that
 * all matter to a grid: it works with no DOM at all (server-side rendering,
 * tests, a worker), it costs no layout read on the render path, and it gives the
 * same answer on every platform. Probing the DOM would mean a style write and a
 * computed-style read per distinct value — a forced synchronous style
 * recalculation in the middle of rendering a viewport, which is precisely the
 * cost `CLAUDE.md` rules out.
 *
 * Values are stored as bare six-digit hex — no `#`, lower case — because that is
 * the form {@link parseColor} consumes, and skipping the prefix keeps the table
 * a little under 3 KB in the bundle.
 *
 * @packageDocumentation
 */
/**
 * The hex digits for a CSS colour keyword, or `undefined` when the name is not
 * one.
 *
 * @param name - A colour keyword. Matched case-insensitively, since `Red`,
 *   `RED` and `red` are the same colour to CSS and all three turn up in real
 *   data.
 * @returns Six lower-case hex digits, without a leading `#`.
 */
export declare function hexForName(name: string): string | undefined;
/**
 * The CSS keyword for a colour, or `undefined` when it has no name.
 *
 * The inverse is one-to-many — `#00ffff` is both `aqua` and `cyan`, `#808080`
 * both `gray` and `grey` — and this answers with whichever the table lists
 * first, so the result is stable rather than merely arbitrary. The `gray`
 * spellings precede the `grey` ones in the table, which makes the American
 * spelling the canonical answer, matching the CSS specification's own ordering.
 *
 * @param hex - Six hex digits, with or without a leading `#`. Case-insensitive.
 * @returns The keyword, or `undefined` when no named colour has that value.
 */
export declare function nameForHex(hex: string): string | undefined;
/** `true` when `name` is a CSS colour keyword. Case-insensitive. */
export declare function isColorName(name: string): boolean;
/**
 * Every supported colour keyword, lower case, in specification order.
 *
 * The list a colour picker's "named colours" palette or a column filter's
 * autocomplete would be built from.
 */
export declare function colorNames(): readonly string[];
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