CLAUDE.md@public/files/bun/src/jsA
CLAUDE.md@public/files/bun/src/js from modem-dev/ossrules is a CLAUDE.md file: the standing instructions Claude Code reads in that repo.
mdr add modem-dev/ossrules/public/files/bun/src/js/CLAUDE.md@git:20260915.977fcedPins git:20260915.977fced in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 14 of 14 checks passed
- Kind
- CLAUDE.md file
- Repository
- modem-dev/ossrules
- Path
public/files/bun/src/js/CLAUDE.md- Versions recorded
- 1
- Latest version
- git:20260915.977fced, committed Sep 15, 2026
- Size
- 2,606 bytes
- Repository stars
- 65
- License
- MIT
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What the file says
# JavaScript Builtins in Bun
Write JS builtins for Bun's Node.js compatibility and APIs. Run `bun bd` after changes.
## Directory Structure
- `builtins/` - Individual functions (`*CodeGenerator(vm)` in C++)
- `node/` - Node.js modules (`node:fs`, `node:path`)
- `bun/` - Bun modules (`bun:ffi`, `bun:sqlite`)
- `thirdparty/` - NPM replacements (`ws`, `node-fetch`)
- `internal/` - Internal modules
## Writing Modules
Modules are NOT ES modules:
```typescript
const EventEmitter = require("node:events"); // String literals only
const { validateFunction } = require("internal/validators");
export default {
myFunction() {
if (!$isCallable(callback)) {
throw $ERR_INVALID_ARG_TYPE("cb", "function", callback);
}
},
};
```
## Writing Builtin Functions
```typescript
// Fifo.ts
export function createFIFO<T>(): Dequeue<T> {
const Dequeue = require("internal/fifo");
return new Dequeue();
}
```
C++ access:
```cpp
object->putDirectBuiltinFunction(vm, globalObject, identifier,
fifoCreateFIFOCodeGenerator(vm), 0);
```
## $ Globals and Special Syntax
**CRITICAL**: Use `.$call` and `.$apply`, never `.call` or `.apply`:
```typescript
// ✗ WRONG - User can tamper
…Read the whole file at its exact version.
How to install
mdr add modem-dev/ossrules/public/files/bun/src/js/CLAUDE.md@sha256:396b545d5afa7a73The line at the top of this page pins the label git:20260915.977fced, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
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Versions
The registry has recorded 1 version of this file, committed on Sep 15, 2026.
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Source
modem-dev/ossrules · 65 stars · license MIT · pushed 2026-09-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xudfi36qqjmhzjud GET https://markdownregistry.com/api/v1/resolve?ref=modem-dev/ossrules/public/files/bun/src/js/CLAUDE.md GET https://markdownregistry.com/api/v1/blob/396b545d5afa7a73b6a613caaef196c596c8d473e245fa0806cc7c1432b432d5
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