Strict Unary Operators

[andreaslarssen]

Issue type

I'm submitting a ... (check one with "x")

• bug report
• feature request

Issue description

Current behavior:
Not 100% this is a bug, but after upgrading from 10 to 11, this warning showed up:

Deprecation This operation is parsed as:

    "Nebular Theme: `nb-theme()` cannot find value for key `" + $key + "` for theme `" + theming-variables.$nb-theme-name + "`"

but you may have intended it to mean:

    "Nebular Theme: `nb-theme()` cannot find value for key `" + $key + "` for theme `" + theming-variables.$nb-theme-name (+"`")

Add a space after + to clarify that it's meant to be a binary operation, or wrap
it in parentheses to make it a unary operation. This will be an error in future
versions of Sass.

More info and automated migrator: https://sass-lang.com/d/strict-unary

null

Steps to reproduce:
It seems to be triggered by theses kind of lines:

 color: nb-theme(some-color-variable);

Other information:

npm, node, OS, Browser
node: v16.18.0
npm: 8.19.2
OS: Ubuntu 22.04.1 LTS

Angular, Nebular

"@angular/core": "15.0.0",
"@nebular/date-fns": "11.0.0",
"@nebular/theme": "11.0.0",

[andreaslarssen]

Replaced all my usages of nb-theme(some-color-variable) with var(--some-color-variable), and the error still persists. Only explicit function-call left to lib is nb-install() and nb-theme-global()