Commit With Frontend and Backend in MERN

backend/node_modules/sift/src/utils.ts

@@ -0,0 +1,74 @@
+export type Key = string | number;
+export type Comparator = (a, b) => boolean;
+export const typeChecker = <TType>(type) => {
+  const typeString = "[object " + type + "]";
+  return function (value): value is TType {
+    return getClassName(value) === typeString;
+  };
+};
+
+const getClassName = (value) => Object.prototype.toString.call(value);
+
+export const comparable = (value: any) => {
+  if (value instanceof Date) {
+    return value.getTime();
+  } else if (isArray(value)) {
+    return value.map(comparable);
+  } else if (value && typeof value.toJSON === "function") {
+    return value.toJSON();
+  }
+
+  return value;
+};
+
+export const coercePotentiallyNull = (value: any) =>
+  value == null ? null : value;
+
+export const isArray = typeChecker<Array<any>>("Array");
+export const isObject = typeChecker<Object>("Object");
+export const isFunction = typeChecker<Function>("Function");
+export const isProperty = (item: any, key: any) => {
+  return item.hasOwnProperty(key) && !isFunction(item[key]);
+};
+export const isVanillaObject = (value) => {
+  return (
+    value &&
+    (value.constructor === Object ||
+      value.constructor === Array ||
+      value.constructor.toString() === "function Object() { [native code] }" ||
+      value.constructor.toString() === "function Array() { [native code] }") &&
+    !value.toJSON
+  );
+};
+
+export const equals = (a, b) => {
+  if (a == null && a == b) {
+    return true;
+  }
+  if (a === b) {
+    return true;
+  }
+
+  if (Object.prototype.toString.call(a) !== Object.prototype.toString.call(b)) {
+    return false;
+  }
+
+  if (isArray(a)) {
+    if (a.length !== b.length) {
+      return false;
+    }
+    for (let i = 0, { length } = a; i < length; i++) {
+      if (!equals(a[i], b[i])) return false;
+    }
+    return true;
+  } else if (isObject(a)) {
+    if (Object.keys(a).length !== Object.keys(b).length) {
+      return false;
+    }
+    for (const key in a) {
+      if (!equals(a[key], b[key])) return false;
+    }
+    return true;
+  }
+  return false;
+};