Puppeteer: Cannot evaluate a string with arguments

String evaluation is supplied with additional arguments.

Error message

Cannot evaluate a string with arguments

How this error happens

evaluateOnNewDocument cannot interpolate arguments into a source-code string. Arguments belong to a function callback.

The snippets use an open Puppeteer page named page.

await page.evaluateOnNewDocument(
    "window.theme = theme",
    "dark"
);

How to fix

Pass a function and let Puppeteer serialize its arguments.

await page.evaluateOnNewDocument(
    (theme) => {
        window.theme = theme;
    },
    "dark"
);

Things to keep in mind

The preload runs in future documents. It does not immediately modify the current page.

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