FunctionAccess

Source: detlef.mjs:200

Borrowed value/object access for an eager Function callback.

Must not be constructed, disposed, or saved for later use. Access expires when the callback returns. Native Functions cannot execute code, mutate variables, or register definitions, including through a captured Runtime.

Alias: FunctionAccess

Instance Methods

value(value: HostValue): Value

Wrap a JavaScript primitive as a DETLEF value, or borrow an existing Value.

Numbers become floats; integers require BigInt within the signed 64-bit range. A new wrapper is temporary inside a registered callback. Otherwise it must be disposed explicitly. Existing wrappers keep their original ownership.

Parameters

• value (HostValue) — Primitive or Value from this runtime.

Returns

• Value — New primitive wrapper, or the supplied Value unchanged.

Throws

• Error — Unsupported input, out-of-range integer, disposed handle, or expired access.

array(elementType: TypeSpec, items?: Array.<HostValue>): Value

Create an array by copying the supplied values. Input wrappers are not consumed. The result follows the same temporary/host-owned lifetime as value().

Parameters

• elementType (TypeSpec) — Element type, not the enclosing array type.
• items (Array.<HostValue>, optional, default: "[]") — Elements to copy.

Returns

• Value — Array wrapper.

Throws

• Error — Invalid type, non-array items, element type mismatch, or expired access.

record(type: string, fields?: Array.<HostValue>): Value

Create an instance of an existing record type. Input wrappers are not consumed. The result follows the same temporary/host-owned lifetime as value().

Parameters

• type (string) — Name of a defined record type.
• fields (Array.<HostValue>, optional, default: "[]") — Values in field declaration order.

Returns

• Value — Record wrapper.

Throws

• Error — Unknown record, field count/type mismatch, or expired access.