Bun-exclusive inventory

This inventory lists targets for I2. Inclusion rule:

Native in Bun (global Bun, bun:*, or documented built-in) and not first-class in Node and not first-class in Deno.

If Node or Deno gain a first-class equivalent later, move the row to a shared matrix and note the date. Pin: see Sources. Reconcile this list against Bun’s docs when the pin changes.

Global `Bun` — I/O and process

API	Why exclusive	Notes for scripty
`Bun.file`	Bun Blob/file ergonomics; not Node/`Deno` shape	Map to Linux fd/path; zero-copy where possible
`Bun.write`	First-class write helper on `Bun`	Paths + Response/Blob sources
`Bun.stdin` / `Bun.stdout` / `Bun.stderr` as Bun File	Bun-specific File handles	—
`Bun.serve`	Bun-shaped HTTP server API (fetch handler style); exclusive by namespace + shape	`Deno.serve` is a different shape (I3); Node needs `http`/`node:http`
`Bun.connect` / TCP helpers on `Bun`	Bun-shaped networking helpers	Confirm pin; implement Linux sockets
`Bun.listen`	Bun listener API if still first-class	Same
`Bun.spawn` / `Bun.spawnSync`	Bun subprocess API (not `child_process` / `Deno.Command`)	Capability-scoped
`Bun.openInEditor` (editor helper) / related DX	Bun-only DX	Optional low priority
`Bun.which`	Path lookup helper	—
`Bun.sleep` / `Bun.sleepSync`	Bun helpers	Thin; still inventory
`Bun.env`	Bun env object surface	Overlaps conceptually; shape differs — keep if Bun-global only
`Bun.main` / `Bun.argv`	Entry metadata	—
`Bun.version` / `Bun.revision`	Runtime identity	scripty should expose scripty identity separately; optional Bun-compat shims later

Global `Bun` — data, crypto, strings

API	Why exclusive	Notes
`Bun.password` (hash/verify)	Built-in password hashing API	Use audited crypto (libsodium/openssl)
`Bun.hash` / `Bun.CryptoHasher`	Bun hashing surface	—
`Bun.CryptoHasher` algorithms (`sha1`, `sha256`, `sha512`, `sha3-256`, `blake2b256`, `md5`, `ripemd160`, …)	Concrete algorithm strings passed to `Bun.CryptoHasher` (no `Bun.SHA*` global exists)	Enumerate supported algorithms as the hash API lands
`Bun.escapeHTML`	Built-in	—
`Bun.stringWidth`	Terminal width	—
`Bun.inspect`	Bun inspect formatting	—
`Bun.deepEquals`	Utility	—
`Bun.nanoseconds`	Timing	—
`Bun.readableStreamTo*` helpers	Bun stream utilities	—
`Bun.Glob`	Built-in glob	—
`Bun.semver`	Built-in semver	—
`Bun.TOML` / YAML parse helpers	Built-in config parsers	Confirm pin
`Bun.JSONC` / related	Built-in	Confirm pin
`Bun.peek`	Promise peek utility	—
`Bun.gc` / memory helpers	Runtime GC controls	Map to scripty GC
`Bun.generateHeapSnapshot`	Diagnostics	Post-core
`Bun.mmap`	Memory-map files	Linux `mmap`

Global `Bun` — cloud / SQL

API	Why exclusive	Notes
`Bun.s3` / `S3Client`	Native S3 client	AWS/R2/MinIO; no AWS SDK required
`Bun.sql` / `SQL` template	Built-in SQL client (Postgres path)	Distinct from `bun:sqlite`
Redis client on `Bun` (if first-class in pin)	Built-in	Confirm against pin; add/remove row

`bun:*` modules

Module	Why exclusive	Notes
`bun:sqlite`	Native SQLite module	High value; use system/sqlite amalgamation
`bun:ffi`	Bun FFI	Zig-friendly; Linux `.so`
`bun:test`	Bun test runner API	Distinct from `node:test` / `Deno.test`
`bun:jsc`	Engine introspection	Do not embed JSC — provide scripty-native equivalents or refuse with matrix reason
`bun:wrap` / internal modules	Rarely public	Only if documented stable

Transpiler / bundler runtime APIs

API	Why exclusive	Notes
`Bun.Transpiler`	Built-in transpile API	Align with scripty transform layer
`Bun.build` (programmatic)	Built-in bundler API	Large; phase late
`Bun.plugin` hooks	Bun-only	Document stability

Intentionally excluded (not I2)

Surface	Reason
`node:*` compatibility	Shared / Node matrix
`fetch` / `Request` / `Response` / `WebSocket`	Web standard; multi-runtime
`fs` / `path` / `buffer`	Node-shaped
npm install performance	PM, not exclusive runtime API
`tsx`/`ts-node` replacement	Transform policy, not Bun-only once others strip types

Maintenance

Diff Bun release notes against this inventory each pin bump
Mark deprecated Bun APIs unsupported with “upstream deprecated”
Prefer behavior tests over cloning Bun bugs unless needed for ecosystem

Get started

v0.0.1-dev program

I1 — ES Engine

I2 — Bun-exclusive

I3 — Deno-exclusive

Reference

Bun-exclusive inventory

Bun-exclusive inventory

Global `Bun` — I/O and process

Global `Bun` — data, crypto, strings

Global `Bun` — cloud / SQL

`bun:*` modules

Transpiler / bundler runtime APIs

Intentionally excluded (not I2)

Maintenance

​Bun-exclusive inventory

​Global Bun — I/O and process

​Global Bun — data, crypto, strings

​Global Bun — cloud / SQL

​bun:* modules

​Transpiler / bundler runtime APIs

​Intentionally excluded (not I2)

​Maintenance

Bun-exclusive inventory

Global `Bun` — I/O and process

Global `Bun` — data, crypto, strings

Global `Bun` — cloud / SQL

`bun:*` modules

Transpiler / bundler runtime APIs

Intentionally excluded (not I2)

Maintenance