Recently(constant) i got some problems with jest/ts-jest setup. Memory leaks, low performance. I have got an idea to first compile typescript to javascript using tsc, and then run jest agains these js files. But jest is still trying to resolve require() paths into .ts files instead of .js files. Does anyone had a similar problem?

jest config

  "jest": {
    "moduleFileExtensions": [
      "js",
      "json"
    ],
    "rootDir": "dist",
    "testRegex": ".spec.js$",
    "testEnvironment": "node"
  },

jest version : 27.0.6

run script

node --expose-gc ./node_modules/.bin/jest --setupFiles dotenv/config --runInBand --detectOpenHandles --forceExit --logHeapUsage

sample error

    Jest encountered an unexpected token

    Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

    Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

    By default "node_modules" folder is ignored by transformers.

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
     • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/configuration
    For information about custom transformations, see:
    https://jestjs.io/docs/code-transformation

    Details:

    SyntaxError: /Users/jakub/Projects/project/src/config/orm.config.ts: Unexpected reserved word 'interface'. (2:0)

      1 | import { TypeOrmModuleOptions } from '@nestjs/typeorm';
    > 2 | interface SeedingOptions {
        | ^
      3 |   factories: string[];
      4 |   seeds: string[];
      5 | }

it should use dist/config/orm.config.js instead of src/config/orm.config.ts

compiled import line

var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const orm_config_1 = __importDefault(require("./../config/orm.config"));