Add exports in package.json (#892)

Author: tushuhei

javascript/package.json

@@ -2,13 +2,25 @@
   "name": "budoux",
   "version": "0.6.4",
   "description": "A small chunk segmenter.",
+  "author": "Shuhei Iitsuka",
+  "license": "Apache-2.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/google/budoux.git",
     "directory": "javascript"
   },
   "main": "./dist/index.js",
   "module": "./module/index.js",
+  "exports": {
+    ".": {
+      "import": "./module/index.js",
+      "require": "./dist/index.js"
+    }
+  },
+  "browser": {
+    "./dist/win.js": "./dist/win-browser.js",
+    "./module/win.js": "./module/win-browser.js"
+  },
   "bin": {
     "budoux": "./bin/budoux.js"
   },
@@ -17,9 +29,9 @@
     "./module/tests/*"
   ],
   "scripts": {
-    "build": "npm run build:es && npm run build:cjs",
+    "build": "npm run build:esm && npm run build:cjs",
     "build:cjs": "tsc && cp -r src/tests/models/ dist/tests/models/",
-    "build:es": "tsc --outDir module --module ES2020 && cp module/win-browser.js module/win.js && cp -r src/tests/models/ module/tests/models/",
+    "build:esm": "tsc --outDir module --module ES2020 && cp -r src/tests/models/ module/tests/models/",
     "bundle": "npm run bundle:webcomponents && npm run bundle:test",
     "bundle:test": "esbuild module/tests/index.browser.js --bundle --sourcemap --outfile=bundle/tests/index.browser.js",
     "bundle:webcomponents": "npm run bundle:webcomponents:ja && npm run bundle:webcomponents:zh-hans && npm run bundle:webcomponents:zh-hant && npm run bundle:webcomponents:th",
@@ -39,12 +51,6 @@
     "lint": "eslint src/** --no-error-on-unmatched-pattern",
     "fix": "eslint src/** --no-error-on-unmatched-pattern --fix"
   },
-  "author": "Shuhei Iitsuka",
-  "license": "Apache-2.0",
-  "browser": {
-    "./dist/win.js": "./dist/win-browser.js",
-    "./module/win.js": "./module/win-browser.js"
-  },
   "devDependencies": {
     "@eslint/eslintrc": "^3.1.0",
     "@eslint/js": "^9.9.0",