fix: use TSN_ESBUILD env instead of tsn2 bin

Author: kirillgroshkov

package.json

@@ -4,7 +4,7 @@
     "prepare": "husky install",
     "debug": "tsn ./src/bin/tsn.ts",
     "tsn-debug": "tsc && CLI_DEBUG=1 node ./dist/bin/tsn.js testscript.ts",
-    "tsn2-debug": "tsc && CLI_DEBUG=1 node ./dist/bin/tsn2.js testscript.ts"
+    "tsn-debug-esbuild": "tsc && CLI_DEBUG=1 TSN_ESBUILD=1 node ./dist/bin/tsn.js testscript.ts"
   },
   "dependencies": {
     "@naturalcycles/nodejs-lib": "^12.8.0",
@@ -32,7 +32,6 @@
   ],
   "main": "dist/index.js",
   "bin": {
-    "tsn2": "dist/bin/tsn2.js",
     "tsn": "dist/bin/tsn.js"
   },
   "publishConfig": {

readme.md

@@ -16,8 +16,8 @@
   `-T -r tsconfig-paths/register -r dotenv/config`. Will use `./scripts/tsconfig.json` (file will be
   auto-generated in not present).
 
-- `tsn2` is an experimental version of `tsn` that uses `esbuild` and `esbuild-register` instead of
-  `typescript` and `ts-node`.
+Set `TSN_ESBUILD` env variable to enable experimental `esbuild` transpilation, using `esbuild` and
+`esbuild-register` instead of `typescript` and `ts-node`.
 
 # Packaging
 

scripts/testscript.ts

@@ -1,7 +1,7 @@
 /*
 
 yarn tsn-debug
-yarn tsn2-debug
+yarn tsn-debug-esbuild
 
  */
 

src/bin/tsn.ts

@@ -8,11 +8,10 @@ import * as fs from 'fs'
 import * as path from 'path'
 import type * as nodejsLib from '@naturalcycles/nodejs-lib/dist/fs'
 import * as c from 'chalk'
-import * as tsnode from 'ts-node'
 
 const projectDir = path.join(__dirname, '../..')
 const cfgDir = `${projectDir}/cfg`
-const { CLI_DEBUG } = process.env
+const { CLI_DEBUG, TSN_ESBUILD } = process.env
 
 try {
   main()
@@ -60,10 +59,18 @@ function main(): void {
   require('loud-rejection/register')
   require('dotenv/config')
 
-  tsnode.register({
-    transpileOnly: true,
-    project: projectTsconfigPath,
-  })
+  if (TSN_ESBUILD) {
+    const { register } = require('esbuild-register/dist/node')
+    register({
+      tsconfigRaw: fs.readFileSync(projectTsconfigPath, 'utf8'),
+    })
+  } else {
+    const tsnode = require('ts-node')
+    tsnode.register({
+      transpileOnly: true,
+      project: projectTsconfigPath,
+    })
+  }
 
   if (fs.existsSync(`./node_modules/tsconfig-paths`)) {
     // ok, for the `paths` it works to load from the root `tsconfig` too