Typescript based configuration doesn't work when using simple preset setup

[derolf]

I am trying to load a typescript config with jest-dynalite.

    Something went wrong reading your jest-dynalite-config.ts: Unexpected token 'export'

      at readConfig (../../node_modules/.pnpm/jest-dynalite@3.4.4_c6ac6979dbeefcbbac9c0114ae514571/node_modules/jest-dynalite/dist/config.js:42:15)
      at async TestScheduler.scheduleTests (../../node_modules/.pnpm/@jest+core@27.3.1/node_modules/@jest/core/build/TestScheduler.js:333:13)

Everything else in my project is TypeScript and works fine. I am having a babel.config.json.

[freshollie]

What's your jest setup, are you using babel jest? Can I see you babel config?

[freshollie]

Also, I assume you are using the preset? It may be that the .ts version of the config only works with the more advanced setups (with setupEnv's). Can you try that?

[derolf]

Thanks for your quick response. Meanwhile, I am using dynalite directly (without jest-dynalite).

I have a setup.ts:

import dynalite from "dynalite";
import * as dynamodb from "@aws-sdk/client-dynamodb";
import * as db from "../src/db";

const dynaliteServer = dynalite({ createTableMs: 0, deleteTableMs: 0, updateTableMs: 0 });

process.env.AWS_REGION = "test";
process.env.AWS_ACCESS_KEY_ID = "test";
process.env.AWS_SECRET_ACCESS_KEY = "test";

beforeAll(async () => {
  await new Promise<void>((resolve) => dynaliteServer.listen(0, () => resolve()));
  const addr = dynaliteServer.address();
  if (!addr || typeof addr === "string") {
    // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
    throw new Error(`${addr}`);
  }

  db.setDdb(new dynamodb.DynamoDB({ endpoint: `http://localhost:${addr.port}` }));
});

beforeEach(async () => {
  await db.ddb.deleteTable({ TableName: "table" }).catch((_) => false);
  await db.ddb.createTable({
    TableName: "table",
    KeySchema: [
      { AttributeName: "pk", KeyType: "HASH" },
      { AttributeName: "id", KeyType: "RANGE" },
    ],
    AttributeDefinitions: [
      { AttributeName: "pk", AttributeType: "S" },
      { AttributeName: "id", AttributeType: "S" },
    ],
    BillingMode: "PAY_PER_REQUEST",
  });
});

afterAll(async () => {
  await new Promise<void>((resolve) => dynaliteServer.close(() => resolve()));
});

and just link it with: setupFilesAfterEnv: [path.join(__dirname, "test-helpers/setup.ts")], in my jest.config.js.

[freshollie]

Cool, you can recreate this with the advanced setup.

I'm going to leave this open whilst I work out what to do with .ts configs

[mikemaccana]

As a suggestion it might be better to allow ES6 module configuration in the 'Simple' setup (and deprecate CommonJS) in the next major release.

[freshollie]

I'm not sure that will help? I think the issue is jest doesn't run the modules it imports, when setting up environment, through the transpiler? I think even if I allowed es6 modules jest wouldn't remove any type information from the file so would fail to run.

[revmischa]

I get this error too using ES modules and jest-dynalite-config.ts: Something went wrong reading your jest-dynalite-config.ts: Unexpected token 'export'

I tried renaming the file to jest-dynalite-config.js - I get the error:

    Something went wrong reading your jest-dynalite-config.js: require() of ES Module /Users/cyber/dev/tombo/sequencer/jest-dynalite-config.js from /Users/cyber/dev/sequencer/node_modules/jest-dynalite/dist/config.js not supported.
    Instead change the require of jest-dynalite-config.js in /Users/cyber/dev/sequencer/node_modules/jest-dynalite/dist/config.js to a dynamic import() which is available in all CommonJS modules.

      at readConfig (node_modules/jest-dynalite/dist/config.js:42:15)
      at getDynalitePort (node_modules/jest-dynalite/dist/config.js:52:33)
      at exports.default (node_modules/jest-dynalite/dist/setup.js:6:47)
      at new DynaliteEnvironment (node_modules/jest-dynalite/dist/environment.js:22:33)