in shimmer/src/main/java/com/facebook/shimmer/Shimmer.java [306:312]
public T setWidthRatio(float widthRatio) {
if (widthRatio < 0f) {
throw new IllegalArgumentException("Given invalid width ratio: " + widthRatio);
}
mShimmer.widthRatio = widthRatio;
return getThis();
}