How does Fresh run esbuild on Deploy without cache writes?

[uncaught application error]: PermissionDenied - Requires write access to '/src/.cache/esbuild/bin', but the file system on Deno Deploy is read-only.

  const [denoResolver, denoLoader] = [...denoPlugins({
    portable: true,
    configPath: resolve('./deno.json'),
  })]

  const results = await esbuild.build({
    plugins: [
      denoResolver,
      solidPlugin({ solid: { moduleName: 'npm:solid-js/web' } }),
      denoLoader
    ],
    entryPoints: ['./www/index.tsx'],
    outfile: '.',
    bundle: true,
    platform: 'browser',
    format: 'esm',
    target: ['chrome99', 'safari15'],
    treeShaking: true,
    write: false,
  })

at Object.mkdir (ext:deno_fs/30_fs.js:140:14)
    at installFromNPM (https://deno.land/x/esbuild@v0.19.4/mod.js:1782:14)
    at eventLoopTick (ext:core/01_core.js:183:11)
    at async install (https://deno.land/x/esbuild@v0.19.4/mod.js:1867:12)
    at async https://deno.land/x/esbuild@v0.19.4/mod.js:1878:23
    at async Module.initialize (https://deno.land/x/esbuild@v0.19.4/mod.js:1768:3)