47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
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// v8 builtin format stack trace
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// for when there was no previous prepareStackTrace function to call
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var FormatStackTrace = require('./formatstack');
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// some notes on the behavior below:
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// because the 'stack' member is a one shot access variable (the raw stack is
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// formatted on accessing it)
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// we try to avoid modifying what the user would have wanted
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// thus we use the previous value for prepareStackTrace
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//
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// The reason we store the callsite variable is because prepareStackTrace
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// will not be called again once it has been called for a given error object
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// but we want to support getting the stack out of the error multiple times (cause why not)
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module.exports = function(err) {
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// save original stacktrace
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var save = Error.prepareStackTrace;
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// replace capture with our function
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Error.prepareStackTrace = function(err, trace) {
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// cache stack frames so we don't have to get them again
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// use a non-enumerable property
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Object.defineProperty(err, '_sb_callsites', {
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value: trace
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});
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return (save || FormatStackTrace)(err, trace);
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};
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// force capture of the stack frames
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err.stack;
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// someone already asked for the stack so we can't do this trick
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// TODO fallback to string parsing?
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if (!err._sb_callsites) {
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return [];
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}
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// return original capture function
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Error.prepareStackTrace = save;
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return err._sb_callsites;
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};
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