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This error indicates that there is a syntax problem in the code related to the use of ||= operator. This operator is a recent addition to the JavaScript language and may not be supported in all environments. It is possible that the version of JavaScript being used does not support this operator, causing the error.

PDF.js is a library for working with PDF files in JavaScript. The error message suggests that there may be a problem with the way that PDF.js is being imported or used in the code. It is possible that there is a conflict with another library or that the import statement is incorrect.

To resolve this issue, try updating to the latest version of PDF.js or using a different version of the JavaScript language that supports the ||= operator. It may also be helpful to review the import statement and ensure that it is formatted correctly.