#!/usr/bin/env node
const fs = require("fs")
const babel = require("@babel/core")

const code = `
export class A {
  #a: string;
}
`

const res = babel.transform(code, {
  filename: "a.ts",
  presets: [
    ["@babel/preset-env", { targets: { node: 14 } }],
    ["@babel/preset-typescript"],
  ],
  plugins: [
    ({ types: t }) => ({
      visitor: {
        ClassDeclaration(path, state) {
          state.a ??= new WeakSet()
          if (state.a.has(path.node)) {
            return
          }
          state.a.add(path.node)

          path.parentPath.replaceWithMultiple([
            t.exportNamedDeclaration(
              t.variableDeclaration("let", [
                t.variableDeclarator(path.node.id, {
                  ...path.node,
                  type: "ClassExpression",
                }),
              ]),
              [],
              null
            ),
          ])
        },
      },
    }),
  ],
})

console.log(res.code)