Type checking with TypeRunner

TypeRunner is a high-performance TypeScript compiler that enables type checking without the need for `tsc` or a JavaScript engine. It compiles TypeScript code to bytecode and runs it in a custom virtual machine. It is portable and independent of Node.js, Deno, or a JavaScript engine. TypeRunner has a proof-of-concept status and supports only a subset of TypeScript's type system. It offers performance benefits over `tsc` and Deno, but has limitations such as lack of support for import statements and references to the Deno global namespace.