Function getOriginalSymbolName

lib/internal/source_map/prepare_stack_trace.js:122–138

(sourceMap, callSite, callerCallSite)

// Transpilers may have removed the original symbol name used in the stack
// trace, if possible restore it from the names field of the source map:
function getOriginalSymbolName(sourceMap, callSite, callerCallSite) {
  // First check for a symbol name associated with the enclosing function:
  const enclosingEntry = sourceMap.findEntry(
    callSite.getEnclosingLineNumber() - 1,
    callSite.getEnclosingColumnNumber() - 1,
  );
  if (enclosingEntry.name) return enclosingEntry.name;
  // Fallback to using the symbol name attached to the caller site:
  const currentFileName = callSite.getFileName();
  if (callerCallSite && currentFileName === callerCallSite.getFileName()) {
    const { name } = sourceMap.findEntry(
      callerCallSite.getLineNumber() - 1,
      callerCallSite.getColumnNumber() - 1,
    );
    return name;
  }
}

/**
 * Return a snippet of code from where the exception was originally thrown