new Buffer() -> TypeError: Cannot read properties of null (reading '0') -> starting on node 20.15

[brunoargolo]

When using esbuild to transpile/bundle specific code on node 20.15 it triggers a runtime error.
The same code transpiled/executed with esbuild on 20.14 works fine.
If we bypass esbuild and run the code directly on 20.15 it also works.

Minimal repo to reproduce: https://github.com/brunoargolo/esbuild-node20.15-exceljs-bug/tree/master

Code:
index.js

import exceljs from 'exceljs';

export const handler = () => {
  const workbook = new exceljs.stream.xlsx.WorkbookWriter({});
  console.log('Success!!!')
}

test.js

import { handler } from "./dist/index.js";
await handler();

esbuild.js is inside repo listed above

volta pin [email protected] && node esbuild.js && node test.js

Error:

node:internal/util:508
        filename[0] !== '/' &&
                ^

TypeError: Cannot read properties of null (reading '0')
    at isInsideNodeModules (node:internal/util:508:17)
    at showFlaggedDeprecation (node:buffer:178:8)
    at new Buffer (node:buffer:266:3)
    at utils.normalizeInputSource (file:///Users/dev/exceljsbug/dist/index.js:44519:16)
    at Archiver.append (file:///Users/dev/exceljsbug/dist/index.js:44932:21)
    at file:///Users/dev/exceljsbug/dist/index.js:49153:20
    at new Promise (<anonymous>)
    at WorkbookWriter.addThemes (file:///Users/dev/exceljsbug/dist/index.js:49152:16)
    at new WorkbookWriter (file:///Users/dev/exceljsbug/dist/index.js:49040:42)
    at handler (file:///Users/dev/exceljsbug/dist/index.js:64169:20)
    at file:///Users/dev/exceljsbug/test.js:2:7
    at ModuleJob.run (node:internal/modules/esm/module_job:222:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:316:24)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:123:5)

volta pin [email protected] && node esbuild.js && node test.js

success!!!

[hyrious]

This seems a Node.js bug: nodejs/node#54296
The test-straight.js works because it simply does not hit the preconditions of the issue: The new Buffer() deprecation check only happens outside of node_modules. The straight way of calling exceljs obviously leaves the code containing new Buffer() inside node_modules. While dist/index.js is outside of it.

[brunoargolo]

Thanks @hyrious , agreed. Closing the bug.

[brunoargolo]

This is now addressed on node 20.17.