esbuild-wasm-bundler/bundler.tsx

import * as ESBuild from "https://deno.land/x/esbuild@v0.19.2/wasm.js";
import * as Mapper from "https://esm.sh/esbuild-plugin-importmaps@1.0.0";
await ESBuild.initialize({ worker: false } as ESBuild.InitializeOptions);
const options = {
  plugins: [Mapper.importmapPlugin({
    "imports": {
        "react": "https://esm.sh/preact@10.22.0/compat",
        "react/": "https://esm.sh/preact@10.22.0/compat/",
        "other": "./other.tsx",
        "entry": "./app.tsx"
    }
})],
  entryPoints: ["entry"],
  bundle: true,
  minify: false,
  format: "esm",
  jsx: "automatic",
  jsxImportSource: "react"
} as ESBuild.BuildOptions;

const result = await ESBuild.build(options);
const decode = new TextDecoder("utf-8")
await Deno.writeTextFile("./dump.js", decode.decode(result.outputFiles?.[0].contents));
ESBuild.stop();