Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 5 Nov 2026. What's built · Install 0.3.0
jadpo
ReferenceErrors

ErrorsReads and writes · rule

data.write_not_entity

Write names a type that isn't an entity.

Area 6, Reads and writes; not declinable; the next step is usually the agent's.

Only an entity is stored, so only an entity has create, update and delete:

example
type DraftName = Text {    max_length: 80}type Draft = Input {    name: DraftName}action save_draft(name: DraftName) -> Draft {    return Draft.create {        set: {            name: name        }    }}
jadpo checkcheck failed: 1 error, 1 file

error Draft isn't an entity, so it has no create

--> main.jadpo:10:12

   |10 |     return Draft.create {   |            ^^^^^^^^^^^^ an input
reason
Only an entity is stored, so only an entity has create, update and delete; Draft is an input, a value built with Draft { ... }.
next
Write the entity this value is stored as, or build the value with Draft { ... } (agent)
rule
data.write_not_entity
help
https://jadpo.dev/docs/errors/data.write_not_entity

Markdown for agents: /docs/errors/data.write_not_entity.md.Built from Jadpo main at aee2e8f.