Puppeteer: Function with name '{value}' does not exist

Removing an exposed page function fails because its name is not registered on that page.

Error message

Function with name '{value}' does not exist

{value} is replaced by the value shown in your error message.

How this error happens

removeExposedFunction can only remove a binding registered on that page. A missing name or a second removal has no binding to remove.

The snippets use an open Puppeteer page named page.

await page.removeExposedFunction(
    "notRegistered"
);

How to fix

Track binding ownership and remove a function only after its registration succeeded.

await page.exposeFunction(
    "readSettings",
    () => {
        return {
            theme: "dark",
        };
    }
);

await page.removeExposedFunction(
    "readSettings"
);

Things to keep in mind

A normal global function written by the website is not a Puppeteer exposed binding.

All Puppeteer errors