Integrate objectbox-js & objectbox-dart

Author: vaind

objectbox-js/.eslintrc.json

@@ -1,7 +1,8 @@
 {
   "root": true,
   "parser": "@typescript-eslint/parser",
-  "parserOptions": { "project": "./tsconfig.json" },
+  // TODO, doesn't like webpack config
+  // "parserOptions": { "project": "./tsconfig.json" },
   "env": { "es6": true },
   "ignorePatterns": ["node_modules", "build", "coverage"],
   "plugins": ["import", "eslint-comments", "functional"],

objectbox-js/README.md

@@ -0,0 +1,23 @@
+# ObjectBox TS/JS (based on IndexedDB)
+
+This is a very basic ObjectBox implementation for JavaScript/TypeScript, based on IndexedDB instead of the native objectbox-c API.
+
+### Build and copy to objectbox-dart
+The following code builds TypeScript files into `build` folder, uses `webpack` to create a single JS,
+copies the JS (and sourcemap) to `../objectbox/lib/`, and generates dart binding code in `../objectbox/lib/src/web/`.
+```
+npm run build:main
+npm run install
+npm run generate:dart
+```
+
+### Notes and useful links about the compilation/integration:
+* modules are not supported, we need to compile to a single JS file (using `webpack`)
+* example: https://github.com/google/chartjs.dart/
+* example: https://github.com/matanlurey/dart_js_interop
+* modules issue: https://github.com/dart-lang/sdk/issues/25059
+  
+### IndexedDB resources
+* https://developers.google.com/web/ilt/pwa/working-with-indexeddb
+* https://www.tutorialspoint.com/html5/html5_indexeddb.htm
+* https://javascript.info/indexeddb