index.ts

#!/usr/bin/env node

import ts from "typescript";
import path from "path";
import { program } from "@commander-js/extra-typings";
import { typeScriptToPython } from "./typeScriptToPython";
import { Ts2PyConfig } from "./config";

const compile = (
  fileNames: string[],
  config: Ts2PyConfig & { strict?: boolean },
) => {
  const program = ts.createProgram(fileNames, {
    noEmit: true,
    allowJs: true,
    resolveJsonModule: true,
    skipLibCheck: true,
    strict: config.strict,
  });

  const relevantSourceFiles = program
    .getSourceFiles()
    .filter((f) =>
      fileNames
        .map((fn) => path.relative(fn, f.fileName) === "")
        .reduce((a, b) => a || b),
    );
  const transpiled = typeScriptToPython(
    program.getTypeChecker(),
    relevantSourceFiles,
    config,
  );
  console.log(transpiled);
};

program
  .name("typescript2python")
  .description("A program that converts TypeScript type definitions to Python")
  .option(
    "--nullable-optionals",
    "if set, optional entries in dictionaries will be nullable, e.g. `NotRequired[Optional[T]]`",
  )
  .option("--strict", "Enable all strict type-checking options.")
  .arguments("<input...>")
  .action((args, options) => {
    compile(args, options);
  })
  .parse(process.argv);