georgecrawford/parcel-entryfile-bug

• See parcel-bundler/parcel#1931
• npm install
• npm start
• Open http://localhost:1234/1.html
• Observe that two JS files are loaded
• Modify CSS, observe HMR update
• Open http://localhost:1234/2.html
• Observe that one JS files is loaded
• Modify CSS, observe no HMR update
• Modify CSS again, observe console error:

Uncaught Error: Cannot find module 'node_modules/parcel-bundler/src/builtins/css-loader.js'
    at newRequire (main.1f19ae8e.js:39)
    at newRequire (main.1f19ae8e.js:23)
    at localRequire (main.1f19ae8e.js:55)
    at Object.eval (eval at hmrApply (main.1f19ae8e.js:230), <anonymous>:3:17)
    at newRequire (main.1f19ae8e.js:49)
    at hmrAccept (main.1f19ae8e.js:263)
    at main.1f19ae8e.js:148
    at Array.forEach (<anonymous>)
    at WebSocket.ws.onmessage (main.1f19ae8e.js:146)