als-require/lib/parse-error.js

A utility for using CommonJS require in the browser and creating bundles.

function parseError(error, modulesLines, curLastLine) {
   let [message, ...stack] = error.stack.split('\n')
   stack = stack.map(string => {
      const m = string.match(/<anonymous>:(\d*):(\d*)\)$/)
      if (!m) return
      const line = Number(m[1])
      if (line + 1 === curLastLine) return
      const char = Number(m[2])
      const errorLines = Object.entries(modulesLines).filter(([path, { from, to }]) => line >= from && line <= to)
      if(errorLines.length === 0) return
      const [path, { from, to }] = errorLines[0]
      const at = string.match(/at\s(.*?)\s/)[1]
      return `    at ${at} ${path} (${line - from - 2}:${char})`
   }).filter(Boolean)
   error.stack = message + '\n' + stack.join('\n')
   throw error
}

module.exports = parseError