#218 · zig-utils/zig-js

Parent: #134 Profile umbrella: #140 Home inventory: #163 Bun inventory: #164 Builds on: #215, #216, and #217

Implement the pinned private-JSC no-copy exports:

Bun__makeArrayBufferWithBytesNoCopy
Bun__makeTypedArrayWithBytesNoCopy

Acceptance criteria:

ArrayBuffer creation adopts the exact non-empty byte pointer and length without copying.
TypedArray creation supports every pinned numeric TypedArrayType tag: Int8, Uint8, Uint8Clamped, Int16, Uint16, Int32, Uint32, Float16, Float32, Float64, BigInt64, and BigUint64.
TypedArray length is floor(byte_length / element_size) while the adopted backing ArrayBuffer retains the full byte length, matching JSC for trailing bytes.
TypeNone, DataView, unknown tags, and non-empty null pointers fail explicitly through the private pending exception boundary.
Empty input returns live zero-length objects without dereferencing the pointer.
The caller-supplied deallocator and context run exactly once at GC/realm teardown; null deallocators are supported without inventing ownership callbacks.
Allocation or view-construction failures release transferred storage exactly once and never publish a partial object.
Focused tests and the Home consumer fixture cover pointer identity, all tags, trailing bytes, empty input, invalid tags, callback context, exactly-once release, and public accessor compatibility.
Inventories, ABI docs, README scorecard, and parent trackers publish the verified counts; benchmark scores remain unchanged unless a benchmark path is rerun.

Completed evidence

Implemented in d8396f26 and documented in c8ffaf00. Focused tests passed 3/3 with zero leaks; the batched engine/consumer/audit gate passed 15/15; the Home consumer fixture passed 198/198. Home is 199/431 implemented (232 pending), Bun core is 193/421 (228 pending), and the public classifier reports 117 public, 19 extensions, and 203 private/support exports.