Use no error handler Use window.onerror Use try / catch block Use protected entry points Use window.addEventListener

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Example error message template Throw basic error Throw string Throw error with native frame Throw async error Named anonymous function Un-named anonymous function Function with displayName Inner function assigned to variable Catch and rethrow error Throw error from inline script (no sourceURL) Throw error from inline script (with sourceURL) Throw error from eval Throw error from eval (with sourceURL) Error from promise Error from rejected promise Error from web worker Error in shared web worker Error in service worker Error in service worker installation

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Error handler output: