"File name X differs from Y only in casing." problem when using webpack style path alias

Type: Bug

I am using webpack-style path aliases for Javascript imports. For example:

import { Pricing } from 'SRC/pricing.mjs';

with a jsconfig.json that looks like this:

{
    "compilerOptions": {
      "module": "es6",
      "target": "es6",
    },
    "baseUrl": ".",
    "paths": {
      "SRC/*": ["./src/*"]
    }
}

With the result that SRC/pricing.mjs is replaced with {baseurl}/src/pricing.mjs no matter what directory the importing code lives in.

This works fine, however I get warnings like the following in the 'Problems' view:

File name '<path to project>/SRC/pricing.mjs' differs from already included file name '<path to project>/src/pricing.mjs' only in casing.
  The file is in the program because:
    Matched by default include pattern '**/*'
    Imported via 'SRC/pricing.mjs' from file '<path to project>/src/page/index-client.js'
    Imported via 'SRC/pricing.mjs' from file '<path to project>/src/page/index-html.js'
    Imported via 'SRC/pricing.mjs' from file '<path to project>/src/page/pricing-calculator-client.js'
    Imported via 'SRC/pricing.mjs' from file '<path to project>/src/page/pricing-calculator-html.js'

I think the code that checks for case insensitivity issues might not be fully / correctly aware of how jsconfig.son path aliases work.

I can workaround the issue by adding "forceConsistentCasingInFileNames": false to compilerOptions however then I don't get the general benefit of this problem detection.

If I use SRC2 or $SRC instead of SRC everything is fine.

VS Code version: Code 1.77.3 (Universal) (704ed70d4fd1c6bd6342c436f1ede30d1cff4710, 2023-04-12T09:19:37.325Z) OS version: Darwin arm64 22.4.0 Modes: Sandboxed: Yes

Item	Value
CPUs	Apple M1 Pro (10 x 24)
GPU Status	2d_canvas: enabledcanvas_oop_rasterization: disabled_offdirect_rendering_display_compositor: disabled_off_okgpu_compositing: enabledmetal: disabled_offmultiple_raster_threads: enabled_onopengl: enabled_onrasterization: enabledraw_draw: disabled_off_okskia_renderer: enabled_onvideo_decode: enabledvideo_encode: enabledvulkan: disabled_offwebgl: enabledwebgl2: enabledwebgpu: disabled_off
Load (avg)	2, 2, 2
Memory (System)	16.00GB (0.23GB free)
Process Argv	--disable-extensions . --crash-reporter-id eef3215b-4736-49de-82a2-9fef6d51c723
Screen Reader	no
VM	0%

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