@saeris/graphql-scalars/dist-src/rgb.js

A collection of scalar types using Joi for validation

import { GraphQLScalarType, GraphQLError, Kind } from "graphql";
import { string as yupString } from "yup";

const validate = value => yupString().strict(true).typeError(`Value is not string: ${value}`).matches(/^rgb\(\s*(-?\d+|-?\d*\.\d+(?=%))(%?)\s*,\s*(-?\d+|-?\d*\.\d+(?=%))(\2)\s*,\s*(-?\d+|-?\d*\.\d+(?=%))(\2)\s*\)$/, `Value is not a valid RGB color: ${value}`).validateSync(value);

export const RGBScalar = `scalar RGB`;
export const RGB = new GraphQLScalarType({
  name: `RGB`,
  description: `A field whose value is a CSS RGB color: https://developer.mozilla.org/en-US/docs/Web/CSS/color_value#rgb()_and_rgba().`,

  serialize(value) {
    return validate(value);
  },

  parseValue(value) {
    return validate(value);
  },

  parseLiteral(ast) {
    if (ast.kind !== Kind.STRING) {
      throw new GraphQLError(`Can only validate strings as RGB colors but got a: ${ast.kind}`);
    }

    return validate(ast.value);
  }

});