Use SWC as compiler

[stevefan1999-personal]

Description of change

This PR will replace tsc with swc, that the responsibility of tsc will be to emit declarations only. SWC is the fastest Typescript transpiler that supports decorators, and because it is written in Rust, making it virtually zero transpilation turnaround time compared to ts-node, and can be seamlessly integrated into Mocha as well using @swc-node/register without needing to prebuild as well. You can now just click the test run button in either VSCode or IDEA to get direct test result. This also means we can use Typescript paths to infer the location of our source code. I have also did a preliminary replacement of ../../../src and such to typeorm instead which resulted in a huge diff in the PR.

Also, by switching the build responsibility to a set of new npm run commands that invokes SWC, this also means you can now save at least 3x time in Gulp that now we lowered it down to around 20 seconds, which is before at least 1 minute. Keep in mind that SWC does have some slight semantic difference compared to the emission of TSC, which is now discovered in some of the tests: ironically speaking, there are unintentional bugs inside tests due to implementation difference between CommonJS and ES modules though.

Bug #1: Cyclic import

ReferenceError: Cannot access 'One' before initialization
    at Object.get (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\test\benchmark\multiple-joins-querybuilder\entity\One.ts:16:14)
    at Object.<anonymous> (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\test\benchmark\multiple-joins-querybuilder\entity\Two.ts:13:13)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Module._compile (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\pirates\lib\index.js:136:24)
    at Module._extensions..js (node:internal/modules/cjs/loader:1124:10)
    at Object.newLoader [as .ts] (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\pirates\lib\index.js:141:7)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:816:12)
    at Module.require (node:internal/modules/cjs/loader:999:19)
    at require (node:internal/modules/cjs/helpers:93:18)
    at Object.<anonymous> (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\test\benchmark\multiple-joins-querybuilder\entity\One.ts:13:14)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Module._compile (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\pirates\lib\index.js:136:24)
    at Module._extensions..js (node:internal/modules/cjs/loader:1124:10)
    at Object.newLoader [as .ts] (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\pirates\lib\index.js:141:7)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:816:12)
    at Module.require (node:internal/modules/cjs/loader:999:19)
    at require (node:internal/modules/cjs/helpers:93:18)
    at Object.<anonymous> (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\test\benchmark\multiple-joins-querybuilder\entity\Eight.ts:12:14)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Module._compile (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\pirates\lib\index.js:136:24)
    at Module._extensions..js (node:internal/modules/cjs/loader:1124:10)
    at Object.newLoader [as .ts] (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\pirates\lib\index.js:141:7)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:816:12)
    at Module.require (node:internal/modules/cjs/loader:999:19)
    at require (node:internal/modules/cjs/helpers:93:18)
    at Object.exports.requireOrImport (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\mocha\lib\esm-utils.js:42:12)
    at Object.exports.loadFilesAsync (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\mocha\lib\esm-utils.js:55:34)
    at singleRun (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\mocha\lib\cli\run-helpers.js:125:3)
    at Object.exports.handler (C:\Users\steve\project\git\github.com\stevefan1999-personal\typeorm\node_modules\mocha\lib\cli\run.js:362:5)

Solution: Lazy initialization by amalgamated export. POC:

// File one.ts
import * as entities from './'
@Entity()
export class Two {
  @Column(() => entities.Two) two: entities.Two
}
// File two.ts
import * as entities from './'
@Entity()
export class Two {
  @Column(() => entities.One) one: entities.One
}
// File index.ts
import { One } from './one'
import { Two } from './two'

export default { One, Two }

Pull-Request Checklist

• Code is up-to-date with the master branch
• npm run format to apply prettier formatting
• npm run test passes with this change
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits follow conventions explained in CONTRIBUTING.md

[stevefan1999-personal]

Test seems to be blocked by swc-project/swc#5047, but I've pinned the last version that can work with circular imports.

[pleerock]

I don't think I want to switch out of tsc at the moment. For now it satisfies me in most of things. Also it's a mainstream right now. Maybe someday in the future. Thanks for suggestion, I'll keep it in mind.