Update test commands (#1205)

* As per @Yun Feng: everyone has npm installed globally but maybe not yarn

* Add command to enable test result updating

* Default to running tests HEADLESS on rrweb

* Add command to build:all in a low memory environment

* Add a 'retest' command for when the code hasn't changed, but you are working on the test cases

* Add commands to reformat according to prettier. Named 'reformat' to indicate that we are doing a `--write`

* Update package.json

Co-authored-by: Yun Feng <yun.feng0817@gmail.com>

* Apply suggestions from code review

Co-authored-by: Yun Feng <yun.feng0817@gmail.com>

* Create few-turkeys-reflect.md

* Apply formatting changes

---------

Co-authored-by: Justin Halsall <Juice10@users.noreply.github.com>
Co-authored-by: Yun Feng <yun.feng0817@gmail.com>

packages/rrweb/package.json

@@ -5,10 +5,14 @@
   "scripts": {
     "prepare": "npm run prepack",
     "prepack": "npm run bundle",
-    "test": "npm run bundle:browser && jest --testPathIgnorePatterns test/benchmark",
-    "test:headless": "PUPPETEER_HEADLESS=true npm run test",
-    "test:watch": "PUPPETEER_HEADLESS=true npm run test -- --watch",
-    "repl": "npm run bundle:browser && node scripts/repl.js",
+    "retest": "jest --testPathIgnorePatterns test/benchmark",
+    "build-and-test": "yarn bundle:browser && yarn retest",
+    "test:headless": "PUPPETEER_HEADLESS=true yarn build-and-test",
+    "test:headful": "PUPPETEER_HEADLESS=false yarn build-and-test",
+    "test": "yarn test:headless",
+    "test:watch": "yarn test:headless -- --watch",
+    "test:update": "yarn test:headless -- --updateSnapshot",
+    "repl": "yarn bundle:browser && node scripts/repl.js",
     "live-stream": "yarn bundle:browser && node scripts/stream.js",
     "dev": "yarn bundle:browser --watch",
     "bundle:browser": "cross-env BROWSER_ONLY=true rollup --config",