Transpiler

jiki uses esbuild-wasm to transpile TypeScript, JSX, and TSX files on the fly. The esbuild WebAssembly binary is loaded lazily on first use, keeping the initial bundle size small.

The transpiler has both synchronous and asynchronous modes. Synchronous mode is used internally by require() for module loading, while the async API is for explicit bundling and transformation tasks.

Features

• Uses esbuild’s WebAssembly build for speed
• The esbuild binary is only loaded when transpilation is first needed
• Synchronous transforms for require(), async for explicit bundling
• Bundle multiple files into a single output with tree-shaking and minification
• Generate source maps for debuggable output

Supported formats

The transpiler handles the following file types:

• .ts — TypeScript
• .tsx — TypeScript with JSX
• .jsx — JavaScript with JSX
• .mts / .cts — TypeScript ESM and CJS variants