Expression DSL

FormX expressions are used by shortcuts, rulesV2.when, compute, resource params, and dynamic configuration.

They are meant to be serializable and reviewable, not a replacement for all JavaScript logic.

Examples

showWhen: 'status === "disabled"'
requiredWhen: 'action === "reject"'
compute: 'price * count'

Object paths:

showWhen: 'database.type === "mysql"'

Scoped array paths:

showWhen: '$self.method === "custom"'

Resource params:

params: {
  province: '${province}',
  source: '${$self.source}'
}

Avoid

Do not put network requests, DOM operations, complex algorithms, or side effects inside expressions. Use resources, validators, or rule effects instead.