graphql-scalars
Version:
A collection of scalar types not included in base GraphQL.
30 lines • 1.16 kB
JavaScript
import { GraphQLScalarType } from 'graphql/type/definition';
import { GraphQLError } from 'graphql/error';
import { Kind } from 'graphql/language';
const RGBA_REGEX = /^rgba\(\s*(-?\d+|-?\d*\.\d+(?=%))(%?)\s*,\s*(-?\d+|-?\d*\.\d+(?=%))(\2)\s*,\s*(-?\d+|-?\d*\.\d+(?=%))(\2)\s*,\s*(-?\d+|-?\d*.\d+)\s*\)$/;
const validate = (value) => {
if (typeof value !== 'string') {
throw new TypeError(`Value is not string: ${value}`);
}
if (!(RGBA_REGEX.test(value))) {
throw new TypeError(`Value is not a valid RGBA color: ${value}`);
}
return value;
};
export default new GraphQLScalarType({
name: `RGBA`,
description: `A field whose value is a CSS RGBA 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 RGBA colors but got a: ${ast.kind}`);
}
return validate(ast.value);
}
});
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