microsoft/playwright · error · Error

Not a function: ${fullMethod}

Error message

Not a function: ${fullMethod}

What it means

Error "Not a function: ${fullMethod}" thrown in microsoft/playwright.

Source

Thrown at packages/extension/src/relayConnection.ts:274

// listener installation.
function resolveChromeMember(fullMethod: string): { obj: any; name: string } {
  const parts = fullMethod.split('.');
  if (parts[0] !== 'chrome' || parts.length < 3)
    throw new Error(`Invalid chrome method: ${fullMethod}`);
  let obj: any = chrome;
  for (let i = 1; i < parts.length - 1; i++) {
    obj = obj?.[parts[i]];
    if (obj === undefined)
      throw new Error(`Unknown chrome path: ${parts.slice(0, i + 1).join('.')}, calling ${fullMethod}`);
  }
  return { obj, name: parts[parts.length - 1] };
}

async function invokeChromeMethod(fullMethod: string, args: any[]): Promise<any> {
  const { obj, name } = resolveChromeMember(fullMethod);
  const fn = obj[name] as (...a: any[]) => any;
  if (typeof fn !== 'function')
    throw new Error(`Not a function: ${fullMethod}`);
  return await fn.apply(obj, args);
}

View on GitHub (pinned to c8fc3bf8d3)

When it happens

Trigger: Thrown at packages/extension/src/relayConnection.ts:274 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/playwright@c8fc3bf8d3 (2026-08-12). Data as JSON: /api/errors/9a277bbfeccfec82. Report an issue: GitHub.