Function getStackString

ses.cjs:7411–7437

(error)

    // string associated with an error.
    // See https://tc39.es/proposal-error-stacks/
    getStackString(error) {
      let stackInfo=  weakmapGet(stackInfos, error);

      if( stackInfo===  undefined) {
        // The following will call `prepareStackTrace()` synchronously
        // which will populate stackInfos
        // eslint-disable-next-line no-void
        void error.stack;
        stackInfo=  weakmapGet(stackInfos, error);
        if( !stackInfo) {
          stackInfo=  { stackString: ''};
          weakmapSet(stackInfos, error, stackInfo);
         }
       }

      // prepareStackTrace() may generate the stackString
      // if errorTaming === 'unsafe'

      if( stackInfo.stackString!==  undefined) {
        return stackInfo.stackString;
       }

      const stackString=  stackStringFromSST(error, stackInfo.callSites);
      weakmapSet(stackInfos, error, { stackString});

      return stackString;
     },
    prepareStackTrace(error, sst) {
      if( errorTaming===  'unsafe') {
        const stackString=  stackStringFromSST(error, sst);