MARKLESS_SERIALIZE_UNSUPPORTED_VALUE

State holds a value that Markless cannot send from the server to the browser.

Error from the runtime, while a page renders or runs.

What happened

Markless sends state from the server to the browser as data. This value is a function or a live object, so it cannot travel that way.

Markless prints the message, the reason, and a suggestion:

MARKLESS_SERIALIZE_UNSUPPORTED_VALUE: Cannot serialize value at <cellPrefix> because unknown values are not durable graph state.
Serialization is for durable graph state. Functions and host/runtime resources cannot be restored during resume.
Move runtime resources into attach={...}, make the value serializable state, or derive it with computed().
https://markless.dev/errors/MARKLESS_SERIALIZE_UNSUPPORTED_VALUE

Words in angle brackets change from case to case.

How to fix it

Keep plain data in state. Create live objects, like sockets, in an attach={...} behavior on an element. If the value comes from other state, use computed().

Where it comes from

@markless/serializer raises this code. Source:

• packages/serializer/src/protocol-state.ts
• packages/serializer/src/value.ts
• packages/web/src/fns/state-slot.ts

Read how to read a Markless error, or go back to all error codes.