Node >= v12.16.0 Cannot install a module without an index.js at root after require() has been called once

[deepal]

Steps to reproduce:

• Install chance first
• Install underscore second

underscore does not have an index.js at the module root. Instead, the entry point is configured via main attribute in package.json

> require('chance')
Fetching and installing module 'chance' from npm...
Done!
[Function: Chance] { Chance: [Circular] }
> require('underscore')
Fetching and installing module 'underscore' from npm...
Done!
Uncaught:
Error: Cannot find module '/Users/deepal/.baapan/workspace_90531_1584193257750/node_modules/underscore'
Require stack:
- <repl>
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:982:15)
    at Function.Module._load (internal/modules/cjs/loader.js:864:27)
    at Module.require (internal/modules/cjs/loader.js:1044:19)
    at Module._module.Module.require (/Users/deepal/Projects/baapan/src/baapan.js:131:34)
    at require (internal/modules/cjs/helpers.js:77:18) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '<repl>' ]
}
> 

This happens if the require() has been called once to install a module dynamically. Installation of the second module is successful, but it cannot be required and throws MODULE_NOT_FOUND error.

This issue is specific to Node v12.16.0 and above.

This issue is due to nodejs/node#29492

[deepal]

This issue is being investigated. Until then a minor workaround is added in #31 and a compatibility warning is displayed as follows.