graphql-http+graphql-jit+type-graphql.js

"use strict";

const { createHandler } = require("graphql-http/lib/use/express");
const express = require("express");
const { parse } = require("graphql");
const { compileQuery } = require("graphql-jit");
const processRequest = require("graphql-upload/processRequest.js");
const {
  createAsyncTypeGraphQLSchema,
} = require("../lib/schemas/createTypeGraphQLSchema");

const app = express();

const cache = {};

createAsyncTypeGraphQLSchema().then((schema) => {
  app.use(
    "/graphql",
    createHandler({
      schema,
      async parseRequestParams(req) {
        const params = await processRequest(req.raw, req.context.res);
        if (Array.isArray(params)) {
          throw new Error("Batching is not supported");
        }
        return {
          ...params,
          // variables must be an object as per the GraphQL over HTTP spec
          variables: Object(params.variables),
        };
      },
      execute: (_, __, { query }) => {
        if (!(query in cache)) {
          const document = parse(query);
          cache[query] = compileQuery(schema, document);
        }

        return {
          schema,
          customExecuteFn: ({ rootValue, variableValues, contextValue }) =>
            cache[query].query(rootValue, contextValue, variableValues),
        };
      },
    }),
  );
  app.listen(4001);
});