Simple example (ts):
```typescript
interface SearchFunc {
(source: string, subString: string): boolean;
}
// Later
let mySearch: SearchFunc;
mySearch = function(source: string, subString: string) { ??? }
```
Simple example (js):
```js
class MyClass = {
foo() { return "foo"; }
bar() { return "bar"; }
}
class ExtendClass extends MyClass {
foo(){ ??? }
bar(){ return `extended bar`; }
}
// Elsewhere
myRunner = (classInstance) => `${classInstance.foo()} ::
${classInstance.bar()}`;
myRunner(myClassInstance);
myRunner(extendedClassInstance);
```
Decorations would be good for classes, but don't work for regular methods.
I'm not sold we need new syntax for this -- I just find myself reaching for
the `???` symbol. Especially in a typed language or in any instance that we
have a class and extended paradigm, or when you have a prescribed "object"
shape.
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