/**
 * The colour expression functions.
 *
 * The producing half (`rgb`, `hsl`, `hsv`) mirrors the CSS colour functions, so `rgb(255, 0, 0)` written
 * as an expression and `"rgb(255, 0, 0)"` written inside a string mean the same thing. Models CSS has no
 * function for (`hsv`) take their own channels but hand back the equivalent `rgb()` string, so every
 * result is a colour any consumer parses.
 *
 * Called with a single argument instead of channels, each of them converts: `hsl('#336699')` is that
 * colour written as `hsl()`. The parsing half (`colorTo*`) goes the other way, splitting a colour into an
 * object of its channels.
 *
 * Anywhere a colour is taken, it may be a CSS colour string in any of the formats above (plus hex and the
 * CSS colour keywords), a 24-bit `0xRRGGBB` number, or a channel object from one of the `colorTo*`
 * functions. Values that are not colours give null.
 */
export declare const COLOR_FUNCTIONS: Record<string, (...args: any[]) => any>;
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