Function loadPyodideAndPackages

packages/worker/web-worker/pyodide/pyodide.ts:43–90

(
  config?: PyodideConfig
)

let pyodide: PyodideInterface
async function loadPyodideAndPackages(
  config?: PyodideConfig
): Promise<PyodideInterface> {
  pyodide = await loadPyodide({
    indexURL: "https://testingcf.jsdelivr.net/pyodide/v0.27.0/full/",
    fullStdLib: false,
    stdout: (text: string) => {
      self.postMessage({
        type: "PythonStdout",
        data: text,
      })
    },
    stderr: (text: string) => {
      self.postMessage({
        type: "PythonStderr",
        data: text,
      })
    },
  })
  const dirHandle = await navigator.storage.getDirectory()
  const permissionStatus = await dirHandle.requestPermission({
    mode: "readwrite",
  })

  if (permissionStatus !== "granted") {
    throw new Error("readwrite access to directory not granted")
  }
  const nativefs = await pyodide.mountNativeFS("/mount_dir", dirHandle)

  await pyodide.loadPackage("micropip")

  if (config?.preloadPackages?.length) {
    const micropip = pyodide.pyimport("micropip")
    await Promise.all(
      config.preloadPackages.map((pkg) => micropip.install(pkg))
    )

    for (const pkg of config.preloadPackages) {
      try {
        pyodide.pyimport(pkg)
      } catch (error) {
        console.warn(`Failed to import preloaded package ${pkg}:`, error)
      }
    }
  }

  return pyodide
}

const getPyodide = async (
  config?: PyodideConfig