Ideally at some point we won't be using transpilers anymore ;)
On Fri, 24 Aug 2018 at 19:37, Bob Myers <r...@gol.com> wrote: > What does line number, or filename for that matter, mean when a file has > gone through one or more transpilation and/or minification passes? > Is the notion that the first processor that touches the file would > substitute those values? > > Bob > > > On Fri, Aug 24, 2018 at 11:34 PM Claude Pache <claude.pa...@gmail.com> > wrote: > >> >> >> Le 24 août 2018 à 05:55, J Decker <d3c...@gmail.com> a écrit : >> >> On Thu, Aug 23, 2018 at 5:26 PM Aaron Gray <aaronngray.li...@gmail.com> >> wrote: >> >>> I am debugging existing code that I have modularized, and am class'izing >>> that has unittests and it just would have been very useful to have this >>> facility. >>> >> In a browser, console.log is usually associated with the file and line >> number anyway; which includes using devtools with node.... but it would be >> handy for logging. with V8 there is console.trace; which spits out the >> stack trace too... before I discovered that I did a logging function >> like... >> >> (from >> https://stackoverflow.com/questions/591857/how-can-i-get-a-javascript-stack-trace-when-i-throw-an-exception >> ) >> function stackTrace() { var err = new Error(); return err.stack; } // >> parse stack to get frame-1 online >> >> // or maybe just frame-1... >> function stackTrace() { var err = new Error(); return err.stack.split( >> "\n" )[1]; } >> >> --- >> function stacktrace() { >> function st2(f) { >> return !f ? [] : >> st2(f.caller).concat([f.toString().split('(')[0].substring(9) + >> '(' + f.arguments.join(',') + ')']); >> } >> return st2(arguments.callee.caller); >> } >> >> EDIT 2 (2017) : >> >> In all modern browsers you can simply call: console.trace(); (MDN >> Reference) >> --- >> >> Although I do still miss just being able to get __FILE__ and __LINE__ >> >> >> >> See also: >> >> https://github.com/tc39/proposal-error-stacks >> >> If/when that proposal is implemented, you'll have a simple way to get a >> *structured* representation of the trace: >> >> ```js >> System.getTrace(new Error) >> ``` >> >> from which you can much more easily extract line number, filename, etc. >> >> —Claude >> > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > -- Aaron Gray Independent Open Source Software Engineer, Computer Language Researcher, Information Theorist, and amateur computer scientist.
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