issue with @Prop decorators in VS Code

[mvolkmann]

All my @Prop decorators have a red underline in VS Code. When I hover over them I see "Unable to resolve signature of property decorator when called as an expression. Argument of type 'undefined' is not assignable to parameter of type 'Object'.ts(1240)"
Here's an example of one:

  @Prop() name: string;

My component works fine despite these errors. What can I do to make VS Code happy?