gistfile1.ts

function safeRun(code: string) {
  const safeCode = `(function () { try { ${code}
    } catch (err) {
      function errorToPretty (err) {
        var stack = $.stack.split('\\n')
        stack.shift()
        stack.pop()
        stack.pop()
        var lines = (err.source && err.source.split('\\n')) || []
        err.line--;
        return {
          name: err.name,
          message: err.message,
          line: err.line,
          context: [
            lines[err.line - 2] || '',
            lines[err.line - 1] || '',
            '---> ' + lines[err.line] || '',
            lines[err.line + 1] || '',
            lines[err.line + 2] || ''
          ],
          stack: stack
        }
      }
      return JSON.stringify(errorToPretty(err))
    }
  })()`;
  return evalExtendscript(safeCode)
    .then(res => {
      if (typeof res === 'object' && res.stack && res.line && res.message && res.context) {
        const e = new Error(`${res.message}\nCONTEXT:\n${res.context.join('\n')}\nSTACK:\n${res.stack.join('\n')}`)
        e.stack = null
        throw e
      }
      return res
    })
}