Fix lint issues resulting from switching to airbnb (#94)

* Fix lint issues resulting from switching to airbnb.

* Case sensitivity change

* Fix lint script to actually lint tsx files

src/lib/util.ts

@@ -25,6 +25,22 @@ export function bind(target: any, propertyKey: string, descriptor: PropertyDescr
   };
 }
 
+/** Creates a function ref that assigns its value to a given property of an object.
+ *  @example
+ *  // element is stored as `this.foo` when rendered.
+ *  <div ref={linkRef(this, 'foo')} />
+ */
+export function linkRef<T>(obj: any, name: string) {
+  const refName = `$$ref_${name}`;
+  let ref = obj[refName];
+  if (!ref) {
+    ref = obj[refName] = (c: T) => {
+      obj[name] = c;
+    };
+  }
+  return ref;
+}
+
 /**
  * Turns a given `ImageBitmap` into `ImageData`.
  */