F_SYSTEM_INVALID_FIELD_DECORATOR_TARGET

Invalid field decorator target

A field option or validator decorator is attached to something other than an instance property.

Updated August 8, 2026 2 weeks ago

Reproduction

Field decorators cannot collect values into static properties:

src/options.ts

import { Flag } from 'func'

class Options {
  @Flag()
  static verbose = false
}

Move the decorator and value to an instance property:

src/options.ts

class Options {
  @Flag()
  verbose = false
}