Version

v22.1.0.

Platform

PS D:\> echo "$([Environment]::OSVersion.VersionString) $(('x86', 'x64')[[Environment]::Is64BitOperatingSystem])"
Microsoft Windows NT 10.0.22631.0 x64

Subsystem

No response

What steps will reproduce the bug?

suppose we have a simple script fake-module.js under C:\Users\dli>:
console.log("fake-module loaded:",{ __filename: __filename, __dirname: __dirname });

`
Microsoft Windows [版本 10.0.22631.3880]

C:\Users\dli>dir | findstr fake
2024/07/31 12:37 95 fake-module.js
C:\Users\dli>

----------------【noctice the disk name is UPPER-case C:】---------

C:\Users\dli>node
Welcome to Node.js v22.1.0.
Type ".help" for more information.

/*
var mod0 = require("./fake-module");
var mod1 = require("C:\Users\dli\fake-module.js");
var mod2 = require("c:\Users\dli\fake-module.js");
*/

var mod0 = require("./fake-module");
fake-module loaded: {
__filename: 'C:\Users\dli\fake-module.js',
__dirname: 'C:\Users\dli'
}

var mod1 = require("C:\Users\dli\fake-module.js");
undefined
var mod2 = require("c:\Users\dli\fake-module.js");
fake-module loaded: {
__filename: 'c:\Users\dli\fake-module.js',
__dirname: 'c:\Users\dli'
}
mod0 === mod1
true
mod0 === mod2
false

Object.keys(require.cache)
[ 'C:\Users\dli\fake-module.js', 'c:\Users\dli\fake-module.js' ]

-----------【noctice the disk name is LOWER-case c:】---------

BUT if some scripts USE cd "c:\Users\dli", such as:

cd "c:\Users\dli"
c:\Users\dli>

Welcome to Node.js v22.1.0.
Type ".help" for more information.

/*
var mod0 = require("./fake-module");
var mod1 = require("C:\Users\dli\fake-module.js");
var mod2 = require("c:\Users\dli\fake-module.js");
*/

var mod0 = require("./fake-module");
fake-module loaded: {
__filename: 'c:\Users\dli\fake-module.js',
__dirname: 'c:\Users\dli'
}

var mod1 = require("C:\Users\dli\fake-module.js");
fake-module loaded: {
__filename: 'C:\Users\dli\fake-module.js',
__dirname: 'C:\Users\dli'
}

var mod2 = require("c:\Users\dli\fake-module.js");
undefined
mod0 === mod1
false
mod0 === mod2
true

Object.keys(require.cache)
[ 'c:\Users\dli\fake-module.js', 'C:\Users\dli\fake-module.js' ]

`

How often does it reproduce? Is there a required condition?

always

What is the expected behavior? Why is that the expected behavior?

I think when require IF os.platform() is windows: for disk-name, it should case-insensitive.

What do you see instead?

duplicate modules

Additional information

No response