graphql-compose/lib/type/json.js.flow

GraphQL schema builder from different data sources with middleware extensions.

// copied from https://github.com/taion/graphql-type-json

import { GraphQLScalarType } from 'graphql';
import { Kind } from 'graphql/language';

function identity(value) {
  return value;
}

function parseLiteral(ast) {
  switch (ast.kind) {
    case Kind.STRING:
    case Kind.BOOLEAN:
      return ast.value;
    case Kind.INT:
    case Kind.FLOAT:
      return parseFloat(ast.value);
    case Kind.OBJECT: {
      const value = Object.create(null);
      ast.fields.forEach((field) => {
        value[field.name.value] = parseLiteral(field.value);
      });

      return value;
    }
    case Kind.LIST:
      return ast.values.map(parseLiteral);
    default:
      return null;
  }
}

export default new GraphQLScalarType({
  name: 'JSON',
  description:
    'The `JSON` scalar type represents JSON values as specified by ' +
    '[ECMA-404](http://www.ecma-international.org/' +
    'publications/files/ECMA-ST/ECMA-404.pdf).',
  serialize: identity,
  parseValue: identity,
  parseLiteral,
});