How do I build with watch enabled using angular-cli?

Question

I don't want to use serve, I know it watches for changes, builds and serves. I want to build upon changes. According to "ng help", build takes parameter --watch

ng build Builds your app and places it into the output path (dist/ by default). --watch (Boolean) (Default: false) aliases: -w --watcher (String)

I tried both -w and --watcher but it just gives error.

>ng build -w  Path must be a string. Received null 

Answer 1

I don´t know if it´s a bug or just not documented, but it seems that you need to add a output path for watching with ng build -o dist -w while dist is your output path.

Update:

The command is now: ng build -op dist -w

Update 2:

The command is now: ng build --output-path dist --watch