esbuild-runner (esr)

A fast on-the-fly transpiler for modern JS, TypeScript, and JSX using esbuild. Current stable version is 2.2.2. Designed as a drop-in replacement for ts-node with significantly faster startup and transpilation by leveraging esbuild instead of the TypeScript compiler. Supports both bundle mode (default) and transform mode with caching. Works as a binary (esr), as a Node.js require hook (-r esbuild-runner/register), and as a Jest transformer. Requires esbuild as a peer dependency.