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

A collection of scalar types using Joi for validation

import { GraphQLScalarType, GraphQLError, Kind } from "graphql";
import { number as yupNumber } from "yup";

const validate = value => {
  yupNumber().typeError(`Value is not a number: ${value}`).notOneOf([Infinity, -Infinity], `Value is not a finite number: ${value}`).required(`Value is not a number: ${value}`).positive(`Value is not a positive number: ${value}`).test(`unsafeInt`, `Value is not a number: ${value}`, val => Number.isSafeInteger(val)).validateSync(value);
  const parsed = parseInt(value, 10);
  yupNumber().strict(true).integer(`Value is not an integer: ${parsed}`).moreThan(0, `Value is not greater than 0: ${parsed}`).validateSync(parsed);
  return parsed;
};

export const PositiveIntScalar = `scalar PositiveInt`;
export const PositiveInt = new GraphQLScalarType({
  name: `PositiveInt`,
  description: `Integers that will have a value greater than 0.`,

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

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

  parseLiteral(ast) {
    if (ast.kind !== Kind.INT) {
      throw new GraphQLError(`Can only validate integers as positive integers but got a: ${ast.kind}`);
    }

    return validate(ast.value);
  }

});