# Rex CLI (`rex`)
This crate provides the `rex` command-line interface.
It is a thin wrapper around the core pipeline:
`rexlang-lexer` → `rexlang-parser` → `rexlang-typesystem` → `rexlang-engine`
## Usage
Run a `.rex` file:
```sh
cargo run -p rexlang-cli -- run rexlang-cli/examples/record_update.rex
```
Run inline code:
```sh
cargo run -p rexlang-cli -- run -c 'map ((*) 2) [1, 2, 3]'
```
Inspect compiler output:
- `--emit-ast`: print the parsed AST as JSON and exit
- `--emit-type` (alias: `--type`): print the inferred type as JSON and exit
## REPL
```sh
cargo run -p rexlang-cli -- repl
```