add hw2

node_modules/@react-stately/utils/dist/useControlledState.main.js

@@ -0,0 +1,74 @@
+var $ecn6s$react = require("react");
+
+
+function $parcel$export(e, n, v, s) {
+  Object.defineProperty(e, n, {get: v, set: s, enumerable: true, configurable: true});
+}
+
+$parcel$export(module.exports, "useControlledState", () => $8d8fdfab47455712$export$40bfa8c7b0832715);
+/*
+ * Copyright 2020 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */ 
+function $8d8fdfab47455712$export$40bfa8c7b0832715(value, defaultValue, onChange) {
+    let [stateValue, setStateValue] = (0, $ecn6s$react.useState)(value || defaultValue);
+    let isControlledRef = (0, $ecn6s$react.useRef)(value !== undefined);
+    let isControlled = value !== undefined;
+    (0, $ecn6s$react.useEffect)(()=>{
+        let wasControlled = isControlledRef.current;
+        if (wasControlled !== isControlled && process.env.NODE_ENV !== 'production') console.warn(`WARN: A component changed from ${wasControlled ? 'controlled' : 'uncontrolled'} to ${isControlled ? 'controlled' : 'uncontrolled'}.`);
+        isControlledRef.current = isControlled;
+    }, [
+        isControlled
+    ]);
+    let currentValue = isControlled ? value : stateValue;
+    let setValue = (0, $ecn6s$react.useCallback)((value, ...args)=>{
+        let onChangeCaller = (value, ...onChangeArgs)=>{
+            if (onChange) {
+                if (!Object.is(currentValue, value)) onChange(value, ...onChangeArgs);
+            }
+            if (!isControlled) // If uncontrolled, mutate the currentValue local variable so that
+            // calling setState multiple times with the same value only emits onChange once.
+            // We do not use a ref for this because we specifically _do_ want the value to
+            // reset every render, and assigning to a ref in render breaks aborted suspended renders.
+            // eslint-disable-next-line react-hooks/exhaustive-deps
+            currentValue = value;
+        };
+        if (typeof value === 'function') {
+            if (process.env.NODE_ENV !== 'production') console.warn('We can not support a function callback. See Github Issues for details https://github.com/adobe/react-spectrum/issues/2320');
+            // this supports functional updates https://reactjs.org/docs/hooks-reference.html#functional-updates
+            // when someone using useControlledState calls setControlledState(myFunc)
+            // this will call our useState setState with a function as well which invokes myFunc and calls onChange with the value from myFunc
+            // if we're in an uncontrolled state, then we also return the value of myFunc which to setState looks as though it was just called with myFunc from the beginning
+            // otherwise we just return the controlled value, which won't cause a rerender because React knows to bail out when the value is the same
+            let updateFunction = (oldValue, ...functionArgs)=>{
+                let interceptedValue = value(isControlled ? currentValue : oldValue, ...functionArgs);
+                onChangeCaller(interceptedValue, ...args);
+                if (!isControlled) return interceptedValue;
+                return oldValue;
+            };
+            setStateValue(updateFunction);
+        } else {
+            if (!isControlled) setStateValue(value);
+            onChangeCaller(value, ...args);
+        }
+    }, [
+        isControlled,
+        currentValue,
+        onChange
+    ]);
+    return [
+        currentValue,
+        setValue
+    ];
+}
+
+
+//# sourceMappingURL=useControlledState.main.js.map