Remove TypeScript

This removes TypeScript and all dependencies and only keeps a simple
Javascript file that does not have any dependencies and can be run
directly. There is not need for an NPM build any more and we just
call a shell script via Javascript.

With this, we no longer have to commit node_modules and Javascript
compiled from TypeScript code. Also, the shell script can easily be run
directly for local testing.

Signed-off-by: Reinhard Naegele <unguiculus@gmail.com>

main.js

@@ -0,0 +1,30 @@
+// Copyright The Helm Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//   # You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+//   # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   # See the License for the specific language governing permissions and
+// limitations under the License.
+
+const spawn = require('child_process').spawn
+const path = require("path");
+
+const main = async () => {
+    await new Promise((resolve, reject) => {
+        const proc = spawn('bash', [path.join(__dirname, 'main.sh')], {stdio: 'inherit'})
+        proc.on('close', resolve)
+        proc.on('error', reject)
+    })
+}
+
+main().catch(err => {
+    console.error(err)
+    console.error(err.stack)
+    process.exit(-1)
+})