chore: improve type safety in breakpoint observer (#14356)
chore: improve type safety in breakpoint observer (#14356)

* Fixes a workaround where we cast the MediaQueryList event listener to any because TypeScript didn't have proper types before TS 3.1.
crisbeto/material2,crisbeto/material2,angular/components,angular/components,angular/components,crisbeto/material2,crisbeto/material2,angular/components