Class PyodideKernelClient

Private_currentMsgId

Private_executionQueue

Private_isExecuting

Private_isReady

Private_lastDisplayData

Private_messageId

Private_pendingExecutions

Private_pyodide

Private_handleDisplayData

• _handleDisplayData(
      msgId: number,
      data: Record<string, unknown>,
      metadata?: Record<string, unknown>,
  ): void

  Handles display_data messages (matplotlib plots, widgets, etc.). This is called when IPython's display() or when matplotlib creates plots.

  Parameters

  • msgId: number
  • data: Record<string, unknown>
  • Optionalmetadata: Record<string, unknown>

  Returns void

Private_handleError

• _handleError(msgId: number, error: unknown): void

  Handles error messages (exceptions, tracebacks). Formats Python tracebacks in Jupyter style without JavaScript stack traces.

  Parameters

  • msgId: number
  • error: unknown

  Returns void

Private_handleIPythonError

• _handleIPythonError(
      msgId: number,
      ename: string,
      evalue: string,
      traceback: string[],
  ): void

  Handles error messages from IPython shell with clean, pre-formatted tracebacks. IPython automatically filters out internal Pyodide frames, providing clean Python-only tracebacks.

  Parameters

  • msgId: number

    Execution message ID

  • ename: string

    Error name (e.g., "SyntaxError", "NameError")

  • evalue: string

    Error message

  • traceback: string[]

    Pre-formatted traceback lines from IPython (already clean!)

  Returns void

Private_handleStderr

• _handleStderr(text: string): void

  Handles stderr output from Pyodide.

  Parameters

  • text: string

  Returns void

Private_handleStdout

• _handleStdout(text: string): void

  Handles stdout output from Pyodide.

  Parameters

  • text: string

  Returns void

Private_preloadPackages

• _preloadPackages(): Promise<void>

  Pre-downloads Python packages from VS Code configuration. Uses micropip to install packages, which caches them for faster subsequent loads. Runs silently in the background - errors are logged but don't block initialization.

  Returns Promise<void>

Private_processQueue

• _processQueue(): Promise<void>

  Processes execution queue sequentially. Ensures only one cell executes at a time per kernel.

  Returns Promise<void>

Private_setupIPythonCallbacks

• _setupIPythonCallbacks(): Promise<void>

  Sets up IPython callbacks for capturing formatted output and clean error tracebacks. This ensures errors don't contain internal Pyodide stack frames.

  Returns Promise<void>