detailed type denifition. currently to support color hex string

[todo]

antv-spec/src/schema/encoding/scale.ts

Lines 1 to 6 in f18179e

	// TODO: detailed type denifition. currently to support color hex string
	export type Scale = {
	// range after data mapping
	// such as ['apple', 'banana'] --map to--> ['red', 'yellow'](range)
	range: (string | number)[];
	rangeMin: string | number;

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This issue was generated by todo based on a TODO comment in f18179e when #9 was merged. cc @antvis.