Add frontend:dev:install configuration

[LGiki]

Add a frontend:dev:install configuration in wails.json to specify the dev dependencies installation command and update the docs.
Fixes #1663

[leaanthony]

This looks good to me! If @stffabi is happy, let's go!

[stffabi]

Thanks @LGiki for this. LGTM, there's just one thing which we might also need to change.

During the build process we also execute an install command before the frontend is getting build. Currently we use the frontend:install even when the build is started for a wails dev build. This feels somehow inconsistent when wails dev first would use frontend:dev:install (if it has been defined) but then the build process for the frontend would execute frontend:install.
I would propose to also use the same logic here if it's called for a dev build:

wails/v2/pkg/commands/build/base.go

Lines 516 to 519 in d5574ba

	if b.projectData.InstallCommand == "" {
	// No - don't install
	outputLogger.Println(" - No Install command. Skipping.")
	} else {

What do you think @leaanthony ?

[leaanthony]

Yeah, good call. @LGiki this is what we do for the build command:

wails/v2/pkg/commands/build/base.go

Lines 533 to 547 in d5574ba

	var buildCommand string
	switch b.projectData.OutputType {
	case "dev":
	buildCommand = b.projectData.DevCommand
	if buildCommand == "" {
	buildCommand = b.projectData.BuildCommand
	}
	default:
	buildCommand = b.projectData.BuildCommand
	}
	if buildCommand == "" {
	outputLogger.Println(" - No Build command. Skipping.")
	// No - ignore
	return nil
	}

[leaanthony]

I'm thinking about how we can also change frontend:dev to frontend:dev:build for consistency. Maybe support both for a bit?

[LGiki]

Thanks, I've pushed a new commit that uses the same logic to handle the install command when building the frontend if it's called for a dev build. And it might be better if I create a new PR to change frontend:dev to frontend:dev:build?

[leaanthony]

Looking good! Just one comment 👍👍👍

[leaanthony]

I think this can be simplified with the helper method you created! 🚀

[LGiki]

🚀 Thanks, I've simplified the logic of determining the installation command.

[leaanthony]

Thanks, I've pushed a new commit that uses the same logic to handle the install command when building the frontend if it's called for a dev build. And it might be better if I create a new PR to change frontend:dev to frontend:dev:build?

That'd be great if you could! I would do something like we've done already and check frontend:dev:build but drop back to frontend:dev for compatibility reasons.

[LGiki]

That'd be great if you could! I would do something like we've done already and check frontend:dev:build but drop back to frontend:dev for compatibility reasons.

Yeah, I will create a PR to do this. 🚀

[stffabi]

LGTM 👍 , thanks so much for the time you have put into this.