initial commit. phase 1 complete

frontend/node_modules/culori/src/jch/definition.js

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+import convertJabToJch from './convertJabToJch.js';
+import convertJchToJab from './convertJchToJab.js';
+import convertJabToRgb from '../jab/convertJabToRgb.js';
+import convertRgbToJab from '../jab/convertRgbToJab.js';
+
+import { fixupHueShorter } from '../fixup/hue.js';
+import { fixupAlpha } from '../fixup/alpha.js';
+import { interpolatorLinear } from '../interpolate/linear.js';
+import { differenceHueChroma } from '../difference.js';
+import { averageAngle } from '../average.js';
+
+const definition = {
+	mode: 'jch',
+
+	parse: ['--jzczhz'],
+	serialize: '--jzczhz',
+
+	toMode: {
+		jab: convertJchToJab,
+		rgb: c => convertJabToRgb(convertJchToJab(c))
+	},
+
+	fromMode: {
+		rgb: c => convertJabToJch(convertRgbToJab(c)),
+		jab: convertJabToJch
+	},
+
+	channels: ['j', 'c', 'h', 'alpha'],
+
+	ranges: {
+		j: [0, 0.221],
+		c: [0, 0.19],
+		h: [0, 360]
+	},
+
+	interpolate: {
+		h: { use: interpolatorLinear, fixup: fixupHueShorter },
+		c: interpolatorLinear,
+		j: interpolatorLinear,
+		alpha: { use: interpolatorLinear, fixup: fixupAlpha }
+	},
+
+	difference: {
+		h: differenceHueChroma
+	},
+
+	average: {
+		h: averageAngle
+	}
+};
+
+export default definition;