⚡ Bolt
A lightweight, lightning-fast, type-safe embeddable language for real-time applications.
import print , error , Error from core import abs , epsilon from math // The return type of safe_divide is inferred to be `Error | number` fn safe_divide ( a : number , b : number ) { if abs ( b ) < epsilon { return error ( "Cannot divide by zero!" ) } return a / b } match let result = safe_divide ( 10 , 5 ) { is Error { // The type of result is narrowed in this branch! print ( "Failed to divide:" , result . what ) } is number { print ( "The answer is" , result ) } }
Features
Lightning-fast performance, outperforming other languages in its class
Compact implementation, leaving a minimal impact on build size while remaining consise enough to browse.
Blazingly quick compilation, plow through code at over 500kloc/thread/second. That's 50'000 lines in the blink of an eye.
Ease of embedding, only a handful of lines to get going
Rich type system to catch errors before code is ran, with plenty of support for extending it from native code
Embed-first design, prioritizing inter-language performance and agility
Links
Dependencies
Bolt only depends on the C standard library as well as libm on Unix-based systems. Some standard library modules include things like file and system IO, but these can be disabled easily. By default, Bolt sets up an environment that uses malloc / realloc / free , but this is also easy to configure. Bolt also embeds my other library picomatch for regex parsing
Minimal embedding example
The bolt-cli program provides a very consice example of how to embed bolt an an application, see the Bolt embedding guide for more details.
Language examples
The examples folder contains a few short examples of ideomatically written bolt code. Check out the tests and benchmarks folders as wel for some more in-depth language overview.
Building
Bolt currently only builds on x64. 32-bit architectures are explicitly not supported, arm and riscv are untested. Running cmake in the root directory of the project will generate a static library for the language, as well as the CLI tool. For more information and options regarding embedding Bolt in your application, see bt_config.h . See below for the status of Bolt on each relevant compiler.
Compiler Status
Please note that Bolt is not yet stable, expect to encounter compiler bugs and crashes. If you do, opening an issue with replicable Bolt code would be much appreciated 😊
Compiler Status Reason MSVC ✅ no issues GCC ✅🟨 all functional, some warnings Clang ✅🟨 all functional, some warnings
Contributing
Bolt is a very opinionated project, and any contributions should take the vision into account.
Bugfixes are likely to be accepted as long as they're within reason and don't change any expected behaviour. Adding tests in case of regression is very much appreciated as well. A clean run of /tests/all is expected of course.
Optimizations may also be accepted for minor versions under similar criteria. A before/after run of /benchmarks/all is expected to evaluate the impact and make sure nothing else regresses. If the specific optimization isn't captured in any existing benchmark, adding one is required.
Feature additions will need a lot of consideration, Bolt is very intentionally minimal in its' design and featureset. I highly suggest you submit some kind of proposal or plan before starting any significant work on a feature to review. Use cases, performance, and implementation cost will all be expected to be justified.
License
Bolt is licensed under MIT. See LICENSE for more information.