KinmokuseiClear source. Readable Go.

A TypeScript-inspired source language for the Go ecosystem—designed for explicit behavior, direct package access, and generated code you can own.

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A quiet sunset reflected across calm water

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Go ecosystem access

Import standard-library and external Go modules directly while preserving named types, pointers, interfaces, methods, generics, channels, and errors.

Productive static syntax

Use classes, value structs, generics, Result, typed exceptions, null safety, and structured tasks—with source-level checks before generation.

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Readable generated Go

Emitted source is deterministic, gofmt-formatted, standalone, and suitable for inspection or publication as an ordinary Go module.

✓

Executable compatibility

Every registered Go-equivalent runtime contract is compared against an independently handwritten Go implementation.

ONE SOURCE FILE · ORDINARY GO

Familiar at the start. Predictable at the boundary.

Kinmokusei checks the language before generation, then produces formatted Go you can inspect, build, test, and publish with the normal Go toolchain.

hello.kmKinmokusei

import go fmt from "fmt";

function main(): void {
  fmt.Println("Hello from Kinmokusei");
}

generated.goGo

// Code generated by Kinmokusei. DO NOT EDIT.
package main

import fmt "fmt"

func main() {
    fmt.Println("Hello from Kinmokusei")
}

keika run hello.kmHello from Kinmokusei

CHOOSE YOUR PATH

Start from where you are

Build your first program

Install the toolchain, check one file, run it, and inspect the generated Go.

Five-minute quick start →Coming from TypeScript

Keep familiar syntax while learning the different runtime, module, error, and task contracts.

Compare the models →Coming from Go

See how values, packages, errors, channels, and generated APIs preserve Go behavior.

Map the concepts →

82 / 82Go-equivalent runtime contracts covered by independent oracles

Go 1.23–1.27supported toolchain range for v0.2

0compiler runtime dependencies in published generated Go

Kinmokusei Programming Language takes its name from the Japanese 金木犀. Say it approximately as kin-moh-koo-say. Kinmokusei borrows familiar TypeScript shapes, but it is neither TypeScript-compatible nor Go-source-compatible; .km source compiles to Go.