Audit Idea: Detect repeated rules in the CSS

[ryelle]

If we run this over a file, it should pull out any place where a property: value; repeats. For example, this should return [ 'border: 1px solid red' ].

.foo {
    padding: 20px;
    border: 1px solid red;
}
.bar {
    padding: 10px;
    border: 1px solid red;
}

[ryelle]

Try looking at postcss-discard-duplicates for inspiration on how to do this.

[ryelle]

The flip side to this could be checking for repeated selectors - so this would return [ .foo ].

.foo {
    border: 1px solid red;
}
.foo {
    display: grid;
}