add use Window helper

pages/contact.tsx

@@ -0,0 +1,96 @@
+import React, { useEffect, useRef, useState } from "react";
+
+const ContactPage = () => {
+  const [state, setState] = useState({
+    myName: "",
+    otherState: false,
+  });
+
+  const aComplexValue = () => {
+    return Math.random();
+  };
+
+  const [expensive] = useState(aComplexValue());
+
+  const myRef = useRef(null);
+  console.log(expensive);
+
+    function emailIsValid (email:string) {
+      return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)
+    }
+
+  const handleChange = (e ) => {
+    console.dir(e)
+    const { name, value } = e.target;
+
+    if(e){
+
+    }
+    setState((s) => ({ ...s, [name]: value }));
+  };
+
+  const handleSubmit = async () => {
+    const payload = encodeURI("cool stuff yes many spaces ")
+
+    await fetch(`/api/hello?animal=${payload}`)
+
+  };
+  // prevState
+  // setState((s) => ({ ...s, "myName": value }));
+
+  // setState({"myName": value });
+  //   };
+
+  const validateField = () => {
+    // if (state.myName.length < 5 || !state.myName.includes("@")) {
+    //   alert("Invalid email");
+    // }
+  };
+
+  //   useEffect(() => {
+  //     if (state.myName.length > 5) {
+  //       alert("Over 5");
+  //     }
+  //   }, [state]);
+
+  //   useEffect(() => {
+  //       //@ts-expect-error
+  //     if ( myRef?.current?.value?.length > 4) {
+  //       alert("Over 4 ref");
+  //     }
+  //   }, [myRef]);
+
+  return (
+    <div>
+      <label>
+        Email:
+        <input
+          aria-label="email for sign up"
+          name="myName"
+          // type="text"
+          onChange={handleChange}
+          onBlur={validateField}
+          placeholder="mike"
+          //   value={state.myName}
+        />
+      </label>
+      {/* <input name="name2" type="text" 
+      onChange={handleChange} 
+    style={{...styles, fontSize:"50px"}}
+      placeholder="mike"
+    //   value={state.myName}
+      /> */}
+      <button
+        onClick={() => {
+          handleSubmit()
+          console.dir(myRef.current);
+          console.dir(myRef);
+        }}
+      >
+        Submit
+      </button>
+    </div>
+  );
+};
+
+export default ContactPage;

src/hooks/useWindowSize.tsx

@@ -0,0 +1,43 @@
+import { useState, useEffect } from "react";
+// Usage
+// function App() {
+//   const size = useWindowSize();
+//   return (
+//     <div>
+//       {size.width}px / {size.height}px
+//     </div>
+//   );
+// }
+
+
+// Hook
+function useWindowSize() {
+  // Initialize state with undefined width/height so server and client renders match
+  // Learn more here: https://joshwcomeau.com/react/the-perils-of-rehydration/
+  const [windowSize, setWindowSize] = useState< {
+    width: undefined | number,
+    height: undefined| number,
+  }>({
+    width: undefined,
+    height: undefined,
+  });
+  useEffect(() => {
+    // Handler to call on window resize
+    function handleResize() {
+      // Set window width/height to state
+      setWindowSize({
+        width: window.innerWidth,
+        height: window.innerHeight,
+      });
+    }
+    // Add event listener
+    typeof window !== undefined && window.addEventListener("resize", handleResize);
+    // Call handler right away so state gets updated with initial window size
+    handleResize();
+    // Remove event listener on cleanup
+    return () => window.removeEventListener("resize", handleResize);
+  }, []); // Empty array ensures that effect is only run on mount
+  return windowSize;
+}
+
+export default useWindowSize