node-source-map-example.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const mkdirp_1 = require("mkdirp");
const node_fs_1 = require("node:fs");
mkdirp_1.mkdirp;
const node_module_1 = require("node:module");
const node_path_1 = require("node:path");
const node_url_1 = require("node:url");
const rel = (p) => (0, node_path_1.relative)(process.cwd(), p);
const getLines = (f) => (0, node_fs_1.readFileSync)(f, 'utf8').split('\n');
const highlight = (lines, l, c) => {
    const line = lines[l - 1];
    const before = line.slice(0, c - 1);
    const after = line.slice(c);
    return l + ':' + c + ' | ' + before + ' >' + line.charAt(c - 1) + '< ' + after;
};
const fn = () => {
    bar();
};
const bar = () => {
    baz();
};
const baz = () => {
    const e = new Error('trace');
    Error.prepareStackTrace = (e, c) => {
        return c.map((c) => {
            const res = {};
            const fileName = res.fileName = c.getFileName();
            const lineNumber = res.lineNumber = c.getLineNumber();
            const columnNumber = res.columnNumber = c.getColumnNumber();
            if (fileName && lineNumber !== null && columnNumber !== null) {
                const sm = (0, node_module_1.findSourceMap)(fileName, e);
                if (sm) {
                    const payload = sm.findEntry(lineNumber, columnNumber);
                    if (payload) {
                        Object.assign(res, payload);
                        res.originalSource = (0, node_url_1.fileURLToPath)(res.originalSource);
                        const lines = getLines(res.fileName);
                        res.fromError = highlight(lines, res.lineNumber, res.columnNumber);
                        res.generated = highlight(lines, res.generatedLine, res.generatedColumn);
                        const oglines = getLines(res.originalSource);
                        res.origin = highlight(oglines, res.originalLine, res.originalColumn);
                        res.originalSource = rel(res.originalSource);
                        res.fileName = rel(res.fileName);
                    }
                }
            }
            return res;
        });
    };
    Error.captureStackTrace(e);
    //@ts-ignore
    console.log(e.stack.filter(c => c.originalSource));
};
fn();
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node-source-map-example.js.map

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node-source-map-example.ts

import { mkdirp } from 'mkdirp'
import {readFileSync} from 'node:fs'
mkdirp
import { findSourceMap } from 'node:module'
import {relative} from 'node:path'
import {fileURLToPath} from 'node:url'

const rel = (p: string) => relative(process.cwd(), p)

const getLines = (f: string) =>
  readFileSync(f, 'utf8').split('\n')

const highlight = (lines: string[], l: number, c: number) => {
  const line = lines[l - 1]
  const before = line.slice(0, c - 1)
  const after = line.slice(c)
  return l + ':' + c + ' | ' + before + ' >' + line.charAt(c - 1) + '< ' + after
}

// just some stuff to be filtered out so line numbers are off more
export interface Something {
  foo: {
    bar: true
    baz: number
  }
}

const fn = () => {
  bar()
}

const bar = () => {
  baz()
}

const baz = () => {
  const e = new Error('trace')
  Error.prepareStackTrace = (e: Error, c: NodeJS.CallSite[]) => {
    return c.map((c):Record<string, any> => {
      const res: Record<string, any> = {}
      const fileName = res.fileName = c.getFileName()
      const lineNumber = res.lineNumber = c.getLineNumber()
      const columnNumber = res.columnNumber = c.getColumnNumber()
      if (fileName && lineNumber !== null && columnNumber !== null) {
        const sm = findSourceMap(fileName, e)
        if (sm) {
          const payload = sm.findEntry(lineNumber, columnNumber)
          if (payload) {
            Object.assign(res, payload)
            res.originalSource = fileURLToPath(res.originalSource)
            const lines = getLines(res.fileName)
            res.fromError = highlight(lines, res.lineNumber, res.columnNumber)
            res.generated = highlight(lines, res.generatedLine, res.generatedColumn)
            const oglines = getLines(res.originalSource)
            res.origin = highlight(oglines, res.originalLine, res.originalColumn)
            res.originalSource = rel(res.originalSource)
            res.fileName = rel(res.fileName)
          }
        }
      }
      return res
    })
  }
  Error.captureStackTrace(e)
  //@ts-ignore
  console.log(e.stack.filter(c => c.originalSource))
}

fn()

Output:

$ node --enable-source-maps node-source-map-example.js
[
  {
    fileName: 'node-source-map-example.js',
    lineNumber: 51,
    columnNumber: 11,
    generatedLine: 51,
    generatedColumn: 4,
    originalSource: 'node-source-map-example.ts',
    originalLine: 64,
    originalColumn: 2,
    name: undefined,
    fromError: '51:11 |     Error. >c< aptureStackTrace(e);',
    generated: '51:4 |     > < Error.captureStackTrace(e);',
    origin: '64:2 |   > < Error.captureStackTrace(e)'
  },
  {
    fileName: 'node-source-map-example.js',
    lineNumber: 21,
    columnNumber: 5,
    generatedLine: 21,
    generatedColumn: 2,
    originalSource: 'node-source-map-example.ts',
    originalLine: 33,
    originalColumn: 1,
    name: undefined,
    fromError: '21:5 |      >b< az();',
    generated: '21:2 |   > <   baz();',
    origin: '33:1 |  > <  baz()'
  },
  {
    fileName: 'node-source-map-example.js',
    lineNumber: 18,
    columnNumber: 5,
    generatedLine: 18,
    generatedColumn: 2,
    originalSource: 'node-source-map-example.ts',
    originalLine: 29,
    originalColumn: 1,
    name: undefined,
    fromError: '18:5 |      >b< ar();',
    generated: '18:2 |   > <   bar();',
    origin: '29:1 |  > <  bar()'
  },
  {
    fileName: 'node-source-map-example.js',
    lineNumber: 55,
    columnNumber: 1,
    generatedLine: 54,
    generatedColumn: 5,
    originalSource: 'node-source-map-example.ts',
    originalLine: 68,
    originalColumn: 4,
    name: undefined,
    fromError: '55:1 |  >f< n();',
    generated: '54:5 | }; >< ',
    origin: '68:4 |  >< '
  }
]