chore(npm): ignore unnecessary files (#5816)

* chore(npm): ignore unnecessary files

* use package#files instead of npmignore

.npmignore

@@ -1,25 +0,0 @@
-# Packages
-node_modules/
-yarn.lock
-
-# Log files
-logs/
-*.log
-
-# Authentication
-deploy/
-
-# Miscellaneous
-.tmp/
-.vscode/
-docs/
-
-# NPM ignore
-.eslintrc.json
-.gitattributes
-.gitignore
-.travis.yml
-.github/
-test/
-tsconfig.json
-tslint.json

package.json

@@ -5,6 +5,10 @@
   "main": "./src/index.js",
   "module": "./src/index.mjs",
   "types": "./typings/index.d.ts",
+  "files": [
+    "src",
+    "typings"
+  ],
   "exports": {
     "require": "./src/index.js",
     "import": "./src/index.mjs"