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# JavaScript Builtins
TLDR:
```bash
# Delete the built files
make clean-bindings generate-builtins && \
# Compile all the C++ files which live in ../bindings
make bindings -j10 && \
# Re-link the binary without compiling zig (so it's faster)
make bun-link-lld-debug
```
JavaScript files in [./js](./js) use JavaScriptCore's builtins syntax
```js
@getter
function foo() {
return @getByIdDirectPrivate(this, "superSecret");
}
```
It looks kind of like decorators but they're not. They let you directly call engine intrinsics and help with avoiding prototype pollution issues.
V8 has a [similar feature](https://v8.dev/blog/embedded-builtins) (they use `%` instead of `@`)
They usually are accompanied by a C++ file.
The `js` directory is necessary for the bindings generator to work.
To regenerate the builtins, run this from Bun's project root (where the `Makefile` is)
```bash
make generate-builtins
```
You'll want to also rebuild all the C++ bindings or you will get strange crashes on start
```bash
make clean-bindings
```
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