Fix ECMAScript modules

[sullyAL]

#172

[francescov1]

Aiming to get this in before eow as long as testing looks good!

[francescov1]

@sullyAL theres a lot of new stuff here, and local dev / tests arent working out of the box. Can you give a quick explanation of the changes? Specifically all the generated lib changes (seems like these should be git ignored?), the rollup usage and how the new ts loader works. Few issues I ran into.

1. I see a whole bunch of warnings when building:

(!) [plugin typescript] src/helpers/tests/artifacts/files.ts (93:17): @rollup/plugin-typescript TS2339: Property 'select' does not exist on type '{}'.
/Users/francescovirga/Projects/mtgen-sully/src/helpers/tests/artifacts/files.ts:93:17

93     return this.select('meta.data');
                   ~~~~~~

(!) [plugin typescript] src/helpers/tests/artifacts/user.ts (2:35): @rollup/plugin-typescript TS2865: Import 'UserSchema' conflicts with local value, so must be declared with a type-only import when 'isolatedModules' is enabled.
/Users/francescovirga/Projects/mtgen-sully/src/helpers/tests/artifacts/user.ts:2:35

2 import { UserDocument, UserModel, UserSchema, UserObject } from "./user.gen";
                                    ~~~~~~~~~~

(!) [plugin typescript] src/helpers/tests/artifacts/user2.ts (2:37): @rollup/plugin-typescript TS2865: Import 'User2Schema' conflicts with local value, so must be declared with a type-only import when 'isolatedModules' is enabled.
/Users/francescovirga/Projects/mtgen-sully/src/helpers/tests/artifacts/user2.ts:2:37

2 import { User2Document, User2Model, User2Schema } from './user2.gen';
                                      ~~~~~~~~~~~

(!) Circular dependency
src/helpers/generator.ts -> src/parser/schema.ts -> src/helpers/generator.ts
created lib/index.js in 5s

2. tests are failing to run

> mongoose-tsgen@9.5.3 test
> npx jest --experimental-vm-modules

● Unrecognized CLI Parameter:

  Unrecognized option "experimental-vm-modules".

  CLI Options Documentation:
  https://jestjs.io/docs/cli

but removing the experimental-vm-modules doesnt resolve it either:

> mongoose-tsgen@9.5.3 test
> npx jest

ReferenceError: module is not defined in ES module scope
This file is being treated as an ES module because it has a '.js' file extension and '/Users/francescovirga/Projects/mtgen-sully/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
    at file:///Users/francescovirga/Projects/mtgen-sully/jest.config.js:1:1
    at ModuleJob.run (node:internal/modules/esm/module_job:234:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:473:24)
    at async importModule (/Users/francescovirga/Projects/mtgen-sully/node_modules/jest-util/build/index.js:987:28)
    at async readConfigFileAndSetRootDir (/Users/francescovirga/Projects/mtgen-sully/node_modules/jest-config/build/index.js:2270:22)
    at async readInitialOptions (/Users/francescovirga/Projects/mtgen-sully/node_modules/jest-config/build/index.js:1147:13)
    at async readConfig (/Users/francescovirga/Projects/mtgen-sully/node_modules/jest-config/build/index.js:918:7)
    at async readConfigs (/Users/francescovirga/Projects/mtgen-sully/node_modules/jest-config/build/index.js:1168:26)
    at async runCLI (/Users/francescovirga/Projects/mtgen-sully/node_modules/@jest/core/build/index.js:1407:7)
    at async Object.run (/Users/francescovirga/Projects/mtgen-sully/node_modules/jest-cli/build/index.js:656:9)

Please ensure everything works as before and is documented

[sullyAL]

Hi @francescov1

Apologise did not tested jest but rather tested it manually and everything worked fine , the tests needed some upgrades mainly adding await due to upgrades done on the packages and renamed jest config file to .cjs

All tests are passing now however I had to make some changes due to my setup (Windows) like normalizing CRLF -> LF due to windows line ending mismatch .

Changed the target to es2018 as well because was failing due to that

As per initial changes used rollup for the bundler mainly because I'm more familiar with it , updated mongoose, @oclif, ts-jest, eslint, typescript and using tsx as a runtime now also upgraded the requirement from node 9 to node 14 (believe we can make this at least 18 or 20)