Class expression not colorized correctly in a .ts file

[mhegazy]

function f() {

    class implements BeingSpreading<Spreading> {
        copy = copy;
        fuse = fuse;
        toInternalSpreading = toInternalSpreading;
        toFiltersOnlySpreading = toFiltersOnlySpreading;
        toResultsOnlySpreading = toResultsOnlySpreading;
        toNormalSpreading = toNormalSpreading;
        toNormalOrMaximizedSpreadingIfNotYet = ensureNormalOrMaximizedSpreading;
    };

    return new class implements BeingSpreading<Spreading> {
        copy = copy;
        fuse = fuse;
        toInternalSpreading = toInternalSpreading;
        toFiltersOnlySpreading = toFiltersOnlySpreading;
        toResultsOnlySpreading = toResultsOnlySpreading;
        toNormalSpreading = toNormalSpreading;
        toNormalOrMaximizedSpreadingIfNotYet = ensureNormalOrMaximizedSpreading;
    };
}