TypeScript type guard: narrows a Material to StandardMaterialProps when it
belongs to the standard family (see getMaterialFamily). A MaterialView over a
standard source also passes, since it inherits every standard property through its prototype
chain.
TypeScript type guard: narrows a Material to StandardMaterialProps when it belongs to the standard family (see getMaterialFamily). A MaterialView over a standard source also passes, since it inherits every standard property through its prototype chain.