$theme does not exist in your theme config

Im getting this $theme does not exist in your theme config issue in that first line that seemingly came out of nowhere. This code snippet is in app\node_modules@angular\material\input_input-theme.scss. I was tinkering around trying to change some default material input styling but I am not sure what caused this. How do I fix this?

@mixin theme($theme) {
@include theming.private-check-duplicate-theme-styles($theme, 'mat-input') {
@if inspection.get-theme-version($theme) == 1 {
@include _theme-from-tokens(inspection.get-theme-tokens($theme));
}
@else {
@include base($theme);
@if inspection.theme-has($theme, color) {
@include color($theme);
}
@if inspection.theme-has($theme, density) {
@include density($theme);
}
@if inspection.theme-has($theme, typography) {
@include typography($theme);
}
}
}
}

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