N3: Made termtype properties readonly (#30624)
N3: Made termtype properties readonly (#30624)


borisyankov/DefinitelyTyped,georgemarshall/DefinitelyTyped,magny/DefinitelyTyped,dsebastien/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,magny/DefinitelyTyped,mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped,borisyankov/DefinitelyTyped