node_modules/material-icons/css/material-icons.scss

@import '../iconfont/variables';
@import '../iconfont/mixins';

$material-icons-css-prefix: 'mi' !default;
$material-icons-css-search: '_' !default;
$material-icons-css-replace: '-' !default;

.#{$material-icons-css-prefix} {
  @include material-icons();
}

@each $name, $codepoint in $material-icons-codepoints {
  $class-name: material-icons-str-replace(
    $name,
    $material-icons-css-search,
    $material-icons-css-replace
  );

  .#{$material-icons-css-prefix}-#{$class-name} {
    @include material-icon($name);
  }
}