path.relative behavior inconsistent on case insensitive file system.

[mattrenaud]

• Version: v9.4.0
• Platform: Darwin matts-air.lan 17.2.0 Darwin Kernel Version 17.2.0: Fri Sep 29 18:27:05 PDT 2017; root:xnu-4570.20.62~3/RELEASE_X86_64 x86_64
• Subsystem: path

I have a small demo program to show this issue.

here is the environment:

$ pwd
/Users/matt/test
$ ls -d $(find .)
.		./dir		./dir/file.json	./index.js

Here is index.js:

const sourceFile = "/users/matt/test/dir/file.json";
const destDir = "/Users/matt/test/dest";

const relativePath = require("path").relative(process.cwd(), sourceFile);
const destPath = require("path").join(destDir, relativePath);

console.log(destPath);

when I run I get:

$ node index.js
/Users/users/matt/test/dir/file.json

Notice /Users/users in the path. If I make a change in index.js:

// ...
const sourceFile = "/Users/matt/test/dir/file.json";
// notice capital "Users"
// ...

I get:

matts-air:test matt$ node index.js
/Users/matt/test/dest/dir/file.json 

/Users/matt/test/dest/dir/file.json is correct. So the case is effecting the result and I would expect the result to be the same on a case insensitive file system.

[bnoordhuis]

This is a duplicate of several other reports. To summarize: it's working as expected, it's not a bug.

The path module doesn't perform I/O, it manipulates strings. It doesn't know about case (in)sensitivity because that is a property of the file system. It can't know about it either because that would rule out the possibility of constructing paths that don't already exist.

[mattrenaud]

Ok thanks