Missing command handler

Reproduction

A registered command must define at least one @Handler() method:

src/app.module.ts

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import { Command, Module, createApp } from 'func'

@Command('build')
class BuildCommand {}

@Module({ commands: [BuildCommand] })
class AppModule {}

createApp(AppModule)

What this error means

func found no Handler metadata on the selected Command. A Command that has Handlers but cannot select one for the current invocation uses F_SYSTEM_NO_MATCHING_HANDLER instead.

How to fix it

Add an instance method decorated with @Handler():

src/build.command.ts

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class BuildCommand {
  @Handler()
  run() {}
}