Cannot find module

Hi,

I hit a problem after migrating from ncc 0.23.0 to 0.27.0. I'm using node 14.15.2.

To reproduce:

1. Create an app.js file with the following content:

const fs = require('fs');
let settingsPath = './settings.json';
if (fs.existsSync(settingsPath)) {
    let settings = require(settingsPath);
    console.log(settings);
}

2. Create a settings.json file with content: {}.
3. Execute: ncc build app.js -o .
4. Run the packaged application using `node index.js. This will result in the following error:

Error: Cannot find module './settings.json'
    at webpackEmptyContext (C:\projects\auroramm\sample123\index.js:21:10)
    at Object.498 (C:\projects\auroramm\sample123\index.js:11:44)
    at __nccwpck_require__ (C:\projects\auroramm\sample123\index.js:61:42)
    at C:\projects\auroramm\sample123\index.js:83:18
    at Object.<anonymous> (C:\projects\auroramm\sample123\index.js:84:12)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12) {
  code: 'MODULE_NOT_FOUND'
}

Note that extracting the fs.existsSync() call in a separate variable produces proper result.

Reproduce the issue with app.js, settings.json, Node 14.15.2, and ncc 0.23.0 versus 0.27.0 using the documented ncc build command. Inspect the generated index.js around the webpackEmptyContext failure and compare it with the case where fs.existsSync is extracted; done means the packaged application can load the existing settings.json without MODULE_NOT_FOUND.