Web Reference: Looks like you're not converting the code to ES5 before minifying, so uglify doesn't understand what () => {} means. If you change it to sleep(1000).then(function() { ... }) it should work unless there are other errors How to Resolve "SyntaxError: Unexpected token" Error in JavaScript The SyntaxError: Unexpected token is one of the most common and generic syntax errors in JavaScript. It's the parser's way of saying, "I found something in your code that I did not expect at this location." The JavaScript exceptions "unexpected token" occur when a specific language construct was expected, but something else was provided. This might be a simple typo.
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