not undefinedStack Overflow

javascript - Node.js TypeError: Parameter 'url' must be a string, not undefined - Stack Overflow
Im trying to parse some urls using url module and http server.Code bellow:var http = require('http
javascriptNodejs TypeError Parameter 39url39 must be a stringnot undefinedStack Overflow
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javascript - vue-class-component: Super expression must either be null or a function, not undefined - Stack Overflow
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javascript - Traceur runtime: Super expression must either be null or a function, not undefined - Stack Overflow
Learning ES6 and have run in to the following error straight off Super expression must either be null o
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