first commit

.eslintrc.json

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+{
+  "env": {
+    "node": true,
+    "es6": true,
+    "browser": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:prettier/recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "modules": true
+    }
+  },
+  "plugins": [
+    "@typescript-eslint",
+    "import"
+  ],
+  "rules": {
+    "prettier/prettier": "error",
+    "no-empty": 0,
+    "@typescript-eslint/explicit-module-boundary-types": 0,
+    "@typescript-eslint/no-non-null-assertion": 0,
+    "@typescript-eslint/no-var-requires": 0,
+    "import/order": [
+      "error",
+      {
+        "groups": [
+          "builtin",
+          "external",
+          "internal",
+          [
+            "parent",
+            "sibling"
+          ],
+          "object",
+          "type",
+          "index"
+        ],
+        "pathGroupsExcludedImportTypes": [
+          "builtin"
+        ],
+        "alphabetize": {
+          "order": "asc",
+          "caseInsensitive": true
+        },
+        "pathGroups": [
+          {
+            "pattern": "@/components/common",
+            "group": "internal",
+            "position": "before"
+          },
+          {
+            "pattern": "@/components/hooks",
+            "group": "internal",
+            "position": "before"
+          }
+        ]
+      }
+    ]
+  }
+}

.gitignore

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+dist
+node_modules
+test

.npmignore

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+.github
+/node_modules
+/src
+.eslintrc.json
+.gitignore
+tsconfig.json
+yarn.lock
+

README.md

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+# @react-libraries/next-apollo-server
+
+Package for calling ApolloServer4 from Next.js.
+'scalar Upload' is available for multipart data.
+
+## Sample
+
+- Source
+  <https://github.com/ReactLibraries/next-apollo-server>
+- App
+  - <https://github.com/SoraKumo001/next-urql>
+  - <https://github.com/SoraKumo001/next-apollo-server>
+
+### src/pages/api/graphql.ts
+
+```ts
+import { promises as fs } from "fs";
+import { ApolloServer } from "@apollo/server";
+import { IResolvers } from "@graphql-tools/utils";
+import {
+  executeHTTPGraphQLRequest,
+  FormidableFile,
+} from "@react-libraries/next-apollo-server";
+import type { NextApiHandler, NextApiRequest, NextApiResponse } from "next";
+
+/**
+ * Type settings for GraphQL
+ */
+const typeDefs = `
+  # Return date
+  scalar Date
+  type Query {
+    date: Date!
+  }
+
+  # Return file information
+  type File {
+    name: String!
+    type: String!
+    value: String!
+  }
+  scalar Upload
+  type Mutation {
+    upload(file: Upload!): File!
+  }
+`;
+
+/**
+ * Set Context type
+ */
+type Context = { req: NextApiRequest; res: NextApiResponse };
+
+/**
+ * Resolver for GraphQL
+ */
+const resolvers: IResolvers<Context> = {
+  Query: {
+    date: async (_context, _args) => new Date(),
+  },
+  Mutation: {
+    upload: async (_context, { file }: { file: FormidableFile }) => {
+      return {
+        name: file.originalFilename,
+        type: file.mimetype,
+        value: await fs.readFile(file.filepath, { encoding: "utf8" }),
+      };
+    },
+  },
+};
+
+/**
+ * apolloServer
+ */
+const apolloServer = new ApolloServer<Context>({
+  typeDefs,
+  resolvers,
+  plugins: [],
+});
+apolloServer.start();
+
+/**
+ * APIRoute handler for Next.js
+ */
+const handler: NextApiHandler = async (req, res) => {
+  // Convert NextApiRequest to body format for GraphQL (multipart/form-data support).
+  return executeHTTPGraphQLRequest({
+    req,
+    res,
+    apolloServer,
+    context: async () => ({ req, res }),
+    options: {
+      // Maximum upload file size set at 10 MB
+      maxFileSize: 10 * 1024 * 1024,
+    },
+  });
+};
+
+export default handler;
+
+export const config = {
+  api: {
+    bodyParser: false,
+  },
+};
+```

package.json

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+{
+  "name": "@react-libraries/next-apollo-server",
+  "version": "0.0.1",
+  "main": "dist/index.js",
+  "license": "MIT",
+  "scripts": {
+    "build": "tsc -b",
+    "lint:fix": "eslint --fix && prettier -w src"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@types/formidable": "^2.0.5",
+    "formidable": "^2.1.1"
+  },
+  "devDependencies": {
+    "@apollo/server": "^4.3.0",
+    "@types/node": "^18.11.18",
+    "@typescript-eslint/eslint-plugin": "^5.47.1",
+    "eslint": "^8.31.0",
+    "eslint-config-next": "^13.1.1",
+    "eslint-config-prettier": "^8.5.0",
+    "eslint-plugin-import": "^2.26.0",
+    "graphql": "^16.6.0",
+    "next": "^13.1.1",
+    "prettier": "^2.8.1",
+    "typescript": "^4.9.4"
+  },
+  "author": "SoraKumo <[email protected]>",
+  "repository": "https://github.com/ReactLibraries/next-apollo-server"
+}

src/index.ts

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+import { promises as fs } from "fs";
+import { parse } from "url";
+import formidable from "formidable";
+import type {
+  ApolloServer,
+  BaseContext,
+  ContextThunk,
+  GraphQLRequest,
+  HTTPGraphQLRequest,
+} from "@apollo/server";
+import type { NextApiRequest, NextApiResponse } from "next";
+
+/**
+ * Request parameter conversion options
+ */
+export type FormidableOptions = formidable.Options;
+
+/**
+ * File type used by resolver
+ */
+export type FormidableFile = formidable.File;
+
+/**
+ * Converting NextApiRequest to Apollo's Header
+ * Identical header names are overwritten by later values
+ * @returns Header in Map format
+ */
+export const createHeaders = (req: NextApiRequest) =>
+  new Map(
+    Object.entries(req.headers).flatMap<[string, string]>(([key, value]) =>
+      Array.isArray(value)
+        ? value.flatMap<[string, string]>((v) => (v ? [[key, v]] : []))
+        : value
+        ? [[key, value]]
+        : []
+    )
+  );
+
+/**
+ *  Retrieve search from NextApiRequest
+ * @returns search
+ */
+export const createSearch = (req: NextApiRequest) =>
+  parse(req.url ?? "").search ?? "";
+
+/**
+ * Make GraphQL requests multipart/form-data compliant
+ * @returns [body to be set in executeHTTPGraphQLRequest, function for temporary file deletion]
+ */
+export const createBody = (
+  req: NextApiRequest,
+  options?: formidable.Options
+) => {
+  const form = formidable(options);
+  return new Promise<[GraphQLRequest, () => void]>((resolve, reject) => {
+    form.parse(req, async (error, fields, files) => {
+      if (error) {
+        reject(error);
+      } else if (!req.headers["content-type"]?.match(/^multipart\/form-data/)) {
+        resolve([fields, () => {}]);
+      } else {
+        if (
+          "operations" in fields &&
+          "map" in fields &&
+          typeof fields.operations === "string" &&
+          typeof fields.map === "string"
+        ) {
+          const request = JSON.parse(fields.operations);
+          const map: { [key: string]: [string] } = JSON.parse(fields.map);
+          Object.entries(map).forEach(([key, [value]]) => {
+            value.split(".").reduce((a, b, index, array) => {
+              if (array.length - 1 === index) a[b] = files[key];
+              else return a[b];
+            }, request);
+          });
+          const removeFiles = () => {
+            Object.values(files).forEach((file) => {
+              if (Array.isArray(file)) {
+                file.forEach(({ filepath }) => {
+                  fs.rm(filepath);
+                });
+              } else {
+                fs.rm(file.filepath);
+              }
+            });
+          };
+          resolve([request, removeFiles]);
+        } else {
+          reject(Error("multipart type error"));
+        }
+      }
+    });
+  });
+};
+
+/**
+ * Creating methods
+ * @returns method string
+ */
+export const createMethod = (req: NextApiRequest) => req.method ?? "";
+
+/**
+ * Execute a GraphQL request
+ */
+export const executeHTTPGraphQLRequest = async <Context extends BaseContext>({
+  req,
+  res,
+  apolloServer,
+  options,
+  context,
+}: {
+  req: NextApiRequest;
+  res: NextApiResponse;
+  apolloServer: ApolloServer<Context>;
+  context: ContextThunk<Context>;
+  options?: FormidableOptions;
+}) => {
+  const [body, removeFiles] = await createBody(req, options);
+  try {
+    const httpGraphQLRequest: HTTPGraphQLRequest = {
+      method: createMethod(req),
+      headers: createHeaders(req),
+      search: createSearch(req),
+      body,
+    };
+    const result = await apolloServer.executeHTTPGraphQLRequest({
+      httpGraphQLRequest,
+      context,
+    });
+    result.status && res.status(result.status);
+    result.headers.forEach((value, key) => {
+      res.setHeader(key, value);
+    });
+    if (result.body.kind === "complete") {
+      res.end(result.body.string);
+    } else {
+      for await (const chunk of result.body.asyncIterator) {
+        res.write(chunk);
+      }
+      res.end();
+    }
+    return result;
+  } finally {
+    removeFiles();
+  }
+};