Use files property in package.json instead of .npmignore (#5320)

Author: watson

.npmignore

@@ -1,5 +1,3 @@
 'use strict'
 
-// TODO: It shouldn't be necessary to disable n/no-unpublished-require - Research
-// eslint-disable-next-line n/no-unpublished-require
 module.exports = require('./packages/datadog-esbuild/index.js')

esbuild.js

@@ -1,5 +1,3 @@
 'use strict'
 
-// TODO: It shouldn't be necessary to disable n/no-unpublished-require - Research
-// eslint-disable-next-line n/no-unpublished-require
 module.exports = require('./packages/dd-trace')

index.js

@@ -1,7 +1,5 @@
 'use strict'
 
-// TODO: It shouldn't be necessary to disable n/no-unpublished-require - Research
-// eslint-disable-next-line n/no-unpublished-require
 var guard = require('./packages/dd-trace/src/guardrails')
 
 module.exports = guard(function () {

init.js

@@ -84,6 +84,31 @@
   "engines": {
     "node": ">=18"
   },
+  "files": [
+    "ci/**/*",
+    "cypress/**/*",
+    "esbuild.js",
+    "ext/**/*",
+    "index.d.ts",
+    "index.js",
+    "init.js",
+    "initialize.mjs",
+    "LICENSE-3rdparty.csv",
+    "LICENSE",
+    "LICENSE.Apache",
+    "LICENSE.BSD3",
+    "loader-hook.mjs",
+    "package.json",
+    "packages/*/index.js",
+    "packages/*/lib/**/*",
+    "packages/*/src/**/*",
+    "packages/datadog-instrumentations/orchestrion.yml",
+    "README.md",
+    "register.js",
+    "scripts/preinstall.js",
+    "vendor/**/*",
+    "version.js"
+  ],
   "dependencies": {
     "@datadog/libdatadog": "0.7.0",
     "@datadog/native-appsec": "9.0.0",