build: Hybrid module

BREAKING CHANGE:
Used `flatMap()`, node.js v12+ is required

Author: unlight

Taskfile

@@ -13,10 +13,12 @@ commit_lint() {
 build_hybrid() {
     set -x
     rm -rfv dist
-    npx tsup src/index.ts -d=dist/mjs --keep-names --format=esm --target=es2020 --external=reflect-metadata --sourcemap
-    npx tsup src/index.ts -d=dist/cjs --keep-names --format=cjs --target=es2020 --external=reflect-metadata --sourcemap
+    formats=('cjs' 'esm')
+    for format in ${formats[*]}; do
+        npx tsup src/index.ts -d=dist/${format} --keep-names --format=${format} --target=es2020 --external=reflect-metadata --sourcemap
+    done
     npx tsup src/index.ts -d=dist --dts-only
-    echo {\"type\": \"module\"} >dist/mjs/package.json
+    echo {\"type\": \"module\"} >dist/esm/package.json
     echo {\"type\": \"commonjs\"} >dist/cjs/package.json
     cp -fv README.md LICENSE dist
     cat package.json | jq "del(.type)" >dist/package.json

package.json

@@ -4,11 +4,11 @@
   "license": "MIT",
   "description": "Convert array of ValidationError objects from class-validator to multiline string",
   "main": "./cjs/index.js",
-  "module": "./mjs/index.mjs",
+  "module": "./esm/index.mjs",
   "types": "index.d.ts",
   "exports": {
     ".": {
-      "import": "./mjs/index.mjs",
+      "import": "./esm/index.mjs",
       "require": "./cjs/index.js"
     }
   },