Function not referenced - zeroing code -> only when using custom scripts

[GeorgeFlorian]

What is the correct way to include or use Functions in custom macros like customInstall ?

I've seen similar issues that have been ignored along the years and I do not understand why:
#1122
#1231
#1239
#3871
#4777

This is a real issue !

The docs do not mention how to include functions when using custom electron scripts.
Please answer.

Thank you.

I include the script like this in package.json : "include": "build/installer.nsh",

I have defined Function SemanticVersionCompare in a script file called version-check.nsh:

; version-check.nsh
Function SemanticVersionCompare
FunctionEnd

!macro SemanticVersionCompare Version1 Version2 Result
  Push "${Version1}"
  Push "${Version2}"
  Call SemanticVersionCompare
  Pop ${Result}
!macroend

!macro CheckVersion
    !insertmacro SemanticVersionCompare "${VERSION}" "$0" $R0
    ; ... other stuff ...
!macroend

installer.nsh

!include "version-check.nsh"

!macro customInstall
  !insertmacro CheckVersion

  WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APP_ID}" "DisplayVersion" "${VERSION}"
  !insertmacro firewallRuleInstall

  WriteUninstaller "$INSTDIR\uninstaller.exe"
!macroend

I have tried these tricks to no avail:

; adding dummy call to the end of installer script
Function __keep_SemanticVersionCompare
  ; Dummy call to trick NSIS compiler into keeping the function
  Call SemanticVersionCompare
FunctionEnd

; declare Function inside customInit
!macro customInit
  Function SemanticVersionCompare
    ; ...
  FunctionEnd
!macroend

; insert CheckVersion in customInit
!macro customInit
  !insertmacro CheckVersion
!macroend

; wrap function in ifndef BUILD_UNINSTALLER block
; also wrap it in BUILD_INSTALLER block
!ifndef BUILD_UNINSTALLER
  Function SemanticVersionCompare
!endif