Functions incorrectly marked as unreferenced

[oliversalzburg]

Issue Type: Bug

Given this code:

const fs = require("fs");

return foo()
  .then(bar);

function foo() {
  return new Promise((resolve) => {
    resolve();
  });
}

function bar() {
}

VS Code will mark the functions foo and bar as unused:

Making apparently random code changes can partially resolve the situation or make it worse again.

Commenting out the require statement will result in both functions being detected as being used. Reverting the change also marks the functions as unused again.

Sometimes only bar is considered unused.

VS Code version: Code 1.49.3 (2af0510, 2020-10-02T17:57:01.595Z)
OS version: Windows_NT x64 10.0.19041
Remote OS version: Linux x64 4.19.128-microsoft-standard
Remote OS version: Linux x64 4.19.128-microsoft-standard
Remote OS version: Linux x64 4.19.128-microsoft-standard
Remote OS version: Linux x64 4.19.128-microsoft-standard

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-6850K CPU @ 3.60GHz (12 x 3598)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off opengl: enabled_on protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	63.91GB (42.09GB free)
Process Argv	--folder-uri=vscode-remote://wsl+Ubuntu/home/oliver/fairmanager/fairmanager/static2 --remote=wsl+Ubuntu --crash-reporter-id f825acfe-92fa-4526-a38a-f8815cf9f7ea
Screen Reader	no
VM	0%

Item	Value
Remote	WSL: Ubuntu
OS	Linux x64 4.19.128-microsoft-standard
CPUs	Intel(R) Core(TM) i7-6850K CPU @ 3.60GHz (12 x 3597)
Memory (System)	50.14GB (42.51GB free)
VM	0%

Item	Value
Remote	WSL: Ubuntu
OS	Linux x64 4.19.128-microsoft-standard
CPUs	Intel(R) Core(TM) i7-6850K CPU @ 3.60GHz (12 x 3597)
Memory (System)	50.14GB (42.51GB free)
VM	0%

Item	Value
Remote	WSL: Ubuntu
OS	Linux x64 4.19.128-microsoft-standard
CPUs	Intel(R) Core(TM) i7-6850K CPU @ 3.60GHz (12 x 3597)
Memory (System)	50.14GB (42.51GB free)
VM	0%

Item	Value
Remote	WSL: Ubuntu
OS	Linux x64 4.19.128-microsoft-standard
CPUs	Intel(R) Core(TM) i7-6850K CPU @ 3.60GHz (12 x 3597)
Memory (System)	50.14GB (42.51GB free)
VM	0%

Extensions (27)

Extension	Author (truncated)	Version
better-toml	bun	0.3.2
vscode-eslint	dba	2.1.8
javascript-ejs-support	Dig	1.3.1
xml	Dot	2.5.1
eslint-disable-snippets	drK	1.2.0
gitlens	eam	10.2.2
EditorConfig	Edi	0.15.1
prettier-vscode	esb	5.7.1
generateuuid	Fir	0.0.5
shell-format	fox	7.0.1
terraform	has	2.2.3
vscode-drawio	hed	1.0.0
vscode-esformatter	how	1.6.0
output-colorizer	IBM	0.1.2
code-beautifier	mic	2.3.3
vscode-puglint	mrm	2.3.0
vscode-docker	ms-	1.6.0
remote-containers	ms-	0.140.1
remote-ssh	ms-	0.55.0
remote-ssh-edit	ms-	0.55.0
remote-wsl	ms-	0.44.5
vscode-remote-extensionpack	ms-	0.20.0
vscode-paste-image	mus	1.0.4
vscode-yaml	red	0.11.1
lit-plugin	run	1.2.1
language-pde	Tob	1.4.6
vscode-icons	vsc	11.0.0

(1 theme extensions excluded)

[mjbvz]

That code is not valid JS; you can't have a top level return statement in a file

To see this error, enable semantic checking