Consider my situation : I am creating a node js module example xyz.js . main.js is my main node file, for example a function is called from xyz and it caused the error due to invalid arguments passed, now I want to just console the line and the line number of main.js which caused the error.

CodePudding user response：

// main.js

const fs = require('fs')
const xyz = require('./xyz')

try {
    const values = xyz(1, 2) // missing 3rd parameter
    console.log(values)
} catch (e) {
    console.warn('Error:', e.message)
    e.stack
        .split('\n')
        .slice(1)
        .map(r => r.match(/\((?<file>.*):(?<line>\d ):(?<pos>\d )\)/))
        .forEach(r => {
            if (r && r.groups && r.groups.file.substr(0, 8) !== 'internal') {
                const { file, line, pos } = r.groups
                const f = fs.readFileSync(file, 'utf8').split('\n')
                console.warn('  ', file, 'at', line ':' pos)
                console.warn('    ', f[line-1].trim())
            }
        })
}

// xyz.js

module.exports = (a, b, c) => {
    if (typeof a === 'undefined')
        throw new Error("Parameter A is not set")
    if (typeof b === 'undefined')
        throw new Error("Parameter B is not set")
    if (typeof c === 'undefined')
        throw new Error("Parameter C is not set")
    return { a, b, c }
}

But as I've said, the original Error's stack makes more sense to me.