rrdom (#613)

* create rrdom package

* test(rrdom): add unit tests for polyfill.ts

* fix(rrweb snapshot): type check errors

Errors are caused by the declaration similarity of @types/mocha and @types/jest if we install both of them in the whole project.

* Set tagNames to upper case by default

This mirrors the `Element.tagName` implementation:

```
For DOM trees which represent HTML documents, the returned tag name is always in the canonical upper-case form. For example, tagName called on a <div> element returns "DIV".
```
https://developer.mozilla.org/en-US/docs/Web/API/Element/tagName

* Add workspace file

* VSCode settings for rrdom tests

* Add basic test for RRDocument

* Only setup jest tests for rrdom

* mock Node type and Event type for nodejs environment

* test(rrdom): add snapshot for document.test.ts

* fix issue of nwsapi import and add unit tests for rrdom

* fix: querySelectorAll returns nothing when querying elements with ids and classNames

* fix: error of unit test for Event polyfill

Since Event class is built in nodejs after v15.0.0

* add a dummy implementation of canvas

* add style element support

* add unit test for style element

Co-authored-by: Justin Halsall <Juice10@users.noreply.github.com>

packages/rrdom/package.json

@@ -0,0 +1,44 @@
+{
+  "name": "rrdom",
+  "version": "0.0.0",
+  "scripts": {
+    "dev": "rollup -c -w",
+    "bundle": "rollup --config",
+    "bundle:es-only": "cross-env ES_ONLY=true rollup --config",
+    "test": "jest",
+    "prepublish": "npm run bundle"
+  },
+  "keywords": [
+    "rrweb",
+    "rrdom"
+  ],
+  "license": "MIT",
+  "main": "lib/rrdom.js",
+  "module": "es/rrdom.js",
+  "typings": "es",
+  "unpkg": "dist/rrdom.js",
+  "files": [
+    "dist",
+    "lib",
+    "es",
+    "typings"
+  ],
+  "devDependencies": {
+    "@rollup/plugin-commonjs": "^20.0.0",
+    "@rollup/plugin-node-resolve": "^13.0.4",
+    "@types/cssom": "^0.4.1",
+    "@types/jest": "^27.0.1",
+    "@types/nwsapi": "^2.2.2",
+    "jest": "^27.1.1",
+    "rollup": "^2.56.3",
+    "rollup-plugin-terser": "^7.0.2",
+    "rollup-plugin-typescript2": "^0.30.0",
+    "rrweb-snapshot": "^1.1.8",
+    "ts-jest": "^27.0.5",
+    "typescript": "^3.9.5"
+  },
+  "dependencies": {
+    "cssom": "^0.5.0",
+    "nwsapi": "^2.2.0"
+  }
+}