scriptc supports a subset of JavaScript, TypeScript, and the Node.js APIs.
This page is a reference for the remaining restrictions and for runtime behavior that differs from Node.js.
You don't need to read it front to back: run [`scriptc coverage`](/docs/coverage) on your program, and come here when a diagnostic or a behavior difference needs more context.
The [Node.js compatibility reference](/compatibility) lists support API by API.

Some entries mention **checked values**.
When the type of a value is only known at runtime, such as `unknown`, `any`, the result of `JSON.parse`, or a value passed through untyped JavaScript, scriptc stores it together with its runtime type and checks it when the program converts it back to a specific type.
Entries that say a value "retains identity through checked storage" mean the same object comes back out, rather than a copy.