precache.txt

$ flutter upgrade
Flutter is already up to date on channel master
Flutter 1.25.0-5.0.pre.119 • channel master • git@github.com:flutter/flutter.git
Framework • revision c88ab79bd2 (6 minutes ago) • 2020-12-08 15:28:30 -0800
Engine • revision de341faa4d
Tools • Dart 2.12.0 (build 2.12.0-125.0.dev)

$ flutter precache

$ flutter config
Configure Flutter settings.
...

Settings:
  enable-macos-desktop: true
  enable-web: true
  enable-windows-desktop: false
  enable-android: false

Analytics reporting is currently enabled.

$ cd scratch 

$ flutter create webtest3
Creating project webtest3...
...

Your application code is in webtest3/lib/main.dart.

$ cd webtest3 

$ flutter run -d chrome
Downloading Web SDK...                                           1,719ms
Launching lib/main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...                 ⢿
...