Please add a `mode` switch to target configuration and `parcel build` CLI command

[SetTrend]

🙋 feature request

I need to be able to see the build result in readable form, i.e., I need a development build, without starting a web server. According to documentation, this is not possbile using the parcel CLI.

🤔 Expected Behavior

There should be a target configuration option mode and a CLI switch for selecting development vs. production mode.

😯 Current Behavior

Currently, parcel [serve] creates a development build and starts a web server, while parcel build creates a production build without starting a web server.

💻 Examples

package.json

{
  "source": "src/**/*",
  "type": "module",
  "scripts":
  {
    "dev:build": "parcel build --target dev --no-content-hash",
    "prod:build": "parcel build --target prod --no-content-hash"
  },
  "targets":
  {
    "dev":
    {
      "mode": "development"
    },
    "prod":
    {
      "mode": "production"
    }
  },
  "devDependencies":
  {
    "parcel": "^2.16.0"
  }
}

CLI

parcel build --development
parcel build --production