Using SuperTest and Jest to test TypeScript Apollo Server: 'request.post' is not a function

Question

I'm trying to use SuperTest to test an Apollo Server following the first answer to this Stack Overflow question, among other examples I've found.

My code in its entirety is

//     /__test__/index.test.ts

import * as request from 'supertest';

    let postData = {
        query: `query allArticles{
                    allArticles{
                        id
                    }
                }`,
        operationName: 'allArticles'
    };

    test('basic', async () => {
        try {
            const response = request
                .post('/graphql')
                .send(postData)
                .expect(200); // status code that you expect to be returned
            console.log('response', response);
        } catch (error) {
            console.log(`error ${error.toString()}`);
        }
    });

However when I run this with Jest

"test": "jest --detectOpenHandles --colors"

I get

 PASS  __test__/index.test.ts
  ● Console

    console.log
    error TypeError: request.post is not a function

      at __test__/index.test.ts:20:11

For what it's worth, I don't think it's "passing" the test, as it doesn't matter what I put in the expect.

If I change my code to follow the Stack Overflow exactly (passing the GraphQL endpoint directly to request

  test('basic', async () => {
            try {
                const response = request('/graphql')
                    .post('/graphql')
                    .send(postData)
                    .expect(200); // status code that you expect to be returned
                console.log('response', response);
            } catch (error) {
                console.log(`error ${error.toString()}`);
            }
        });

I get

PASS  __test__/index.test.ts
  ● Console

    console.log
      error TypeError: request is not a function

      at __test__/index.test.ts:20:11

I'm using ts-jest, and running under Node 12.14

My tsconfig.json is

{
  "compilerOptions": {
    "target": "ES6",
    "lib": [
      "esnext",
      "dom"
    ],
    "skipLibCheck": true,
    "outDir": "dist",
    "strict": false,
    "forceConsistentCasingInFileNames": true,
    "esModuleInterop": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "sourceMap": true,
    "alwaysStrict": true
  },
  "exclude": [
    "node_modules",
    "**/*.test.ts",
    "**/*.mock.ts"
  ]
}

and my jest.config is

module.exports = {
    preset: 'ts-jest',
    testEnvironment: 'node'
};

Any clues appreciated!

Answer 1

supertest has no export, which is why need to change your import to

import {default as request} from 'supertest';

request is now the exported factory function which you can invoke:

const response = request('/graphql')
                    .post('/graphql')
...