node_modules/@angular/material/core/style/_private.scss

@import './elevation';

@mixin mat-private-theme-elevation($zValue, $config, $opacity: $mat-elevation-opacity) {
  $foreground: map-get($config, foreground);
  $elevation-color: map-get($foreground, elevation);
  $elevation-color-or-default: if($elevation-color == null, $mat-elevation-color, $elevation-color);

  @include mat-elevation($zValue, $elevation-color-or-default, $opacity);
}

@mixin mat-private-theme-overridable-elevation($zValue, $config, $opacity: $mat-elevation-opacity) {
  $foreground: map-get($config, foreground);
  $elevation-color: map-get($foreground, elevation);
  $elevation-color-or-default: if($elevation-color == null, $mat-elevation-color, $elevation-color);

  @include mat-overridable-elevation($zValue, $elevation-color-or-default, $opacity);
}

// If the mat-animation-noop class is present on the components root element,
// prevent non css animations from running.
// NOTE: Currently this mixin should only be used with components that do not
// have any projected content.
@mixin mat-private-animation-noop() {
  // @at-root is used to steps outside of the hierarchy of the scss rules. This is
  // done to allow a class to be added to be added to base of the scss nesting
  // context.
  // For example:
  // .my-root {
  //   .my-subclass {
  //      @include mat-private-animation-noop();
  //    }
  // }
  // results in:
  // ._mat-animation-noopable.my-root .my-subclass { ... }
  @at-root ._mat-animation-noopable#{&} {
    transition: none;
    animation: none;
    @content;
  }
}