refactor: Have load export a function (#1869)

Instead of the constructor.

__BREAKING CHANGES__

Low potential for breakages:
- Removed the internal `_originalRoot` property. Some methods, such as `appendTo`, can now have their roots overwritten by passing the `root` property to `CheerioAPI`.
- The `default` export now has a surrounding `Document`, without any contents.

Co-authored-by: 5saviahv <49443574+5saviahv@users.noreply.github.com>

Readme.md

@@ -164,7 +164,7 @@ Cheerio's selector implementation is nearly identical to jQuery's, so the API is
 
 `selector` searches within the `context` scope which searches within the `root` scope. `selector` and `context` can be a string expression, DOM Element, array of DOM elements, or cheerio object. `root` is typically the HTML document string.
 
-This selector method is the starting point for traversing and manipulating the document. Like jQuery, it's the primary method for selecting elements in the document, but unlike jQuery it's built on top of the CSSSelect library, which implements most of the Sizzle selectors.
+This selector method is the starting point for traversing and manipulating the document. Like jQuery, it's the primary method for selecting elements in the document.
 
 ```js
 $('.apple', '#fruits').text();

src/__tests__/deprecated.spec.ts

@@ -58,7 +58,7 @@ describe('deprecated APIs', () => {
 
       // #1674 - merge, wont accept Cheerio object
       it('should be a able merge array and cheerio object', () => {
-        const ret = cheerio.merge(new cheerio(), ['elem1', 'elem2'] as any);
+        const ret = cheerio.merge(cheerio(), ['elem1', 'elem2'] as any);
         expect(typeof ret).toBe('object');
         expect(ret).toHaveLength(2);
       });
@@ -202,7 +202,8 @@ describe('deprecated APIs', () => {
     describe('.root', () => {
       it('returns an empty selection', () => {
         const $empty = cheerio.root();
-        expect($empty).toHaveLength(0);
+        expect($empty).toHaveLength(1);
+        expect($empty[0].children).toHaveLength(0);
       });
     });
   });

src/api/forms.spec.ts

@@ -1,5 +1,5 @@
 import cheerio from '../../src';
-import type { CheerioAPI } from '../cheerio';
+import type { CheerioAPI } from '../load';
 import { forms } from '../__fixtures__/fixtures';
 
 describe('$(...)', () => {

src/api/forms.ts

@@ -1,5 +1,5 @@
 import type { Node } from 'domhandler';
-import type { Cheerio, CheerioAPI } from '../cheerio';
+import type { Cheerio } from '../cheerio';
 import { isTag } from '../utils';
 
 /*
@@ -54,9 +54,8 @@ export function serializeArray<T extends Node>(
   this: Cheerio<T>
 ): SerializedField[] {
   // Resolve all form elements from either forms or collections of form elements
-  const Cheerio = this.constructor as CheerioAPI;
   return this.map((_, elem) => {
-    const $elem = Cheerio(elem);
+    const $elem = this._make(elem);
     if (isTag(elem) && elem.name === 'form') {
       return $elem.find(submittableSelector).toArray();
     }
@@ -72,7 +71,7 @@ export function serializeArray<T extends Node>(
       // Convert each of the elements to its value(s)
     )
     .map<Node, SerializedField>((_, elem) => {
-      const $elem = Cheerio(elem);
+      const $elem = this._make(elem);
       const name = $elem.attr('name') as string; // We have filtered for elements with a name before.
       // If there is no value set (e.g. `undefined`, `null`), then default value to empty
       const value = $elem.val() ?? '';

src/api/manipulation.spec.ts

@@ -1,5 +1,5 @@
 import { load } from '../../src';
-import type { CheerioAPI, Cheerio } from '../cheerio';
+import type { CheerioAPI, Cheerio } from '..';
 import { fruits, divcontainers, mixedText } from '../__fixtures__/fixtures';
 import type { Node, Element } from 'domhandler';
 

src/api/manipulation.ts

@@ -168,9 +168,7 @@ export function appendTo<T extends Node>(
   this: Cheerio<T>,
   target: BasicAcceptedElems<Node>
 ): Cheerio<T> {
-  const appendTarget = isCheerio(target)
-    ? target
-    : this._make(target, null, this._originalRoot);
+  const appendTarget = isCheerio(target) ? target : this._make(target);
 
   appendTarget.append(this);
 
@@ -202,9 +200,7 @@ export function prependTo<T extends Node>(
   this: Cheerio<T>,
   target: BasicAcceptedElems<Node>
 ): Cheerio<T> {
-  const prependTarget = isCheerio(target)
-    ? target
-    : this._make(target, null, this._originalRoot);
+  const prependTarget = isCheerio(target) ? target : this._make(target);
 
   prependTarget.prepend(this);
 
@@ -642,7 +638,7 @@ export function insertAfter<T extends Node>(
   target: BasicAcceptedElems<Node>
 ): Cheerio<T> {
   if (typeof target === 'string') {
-    target = this._make<Node>(target, null, this._originalRoot);
+    target = this._make<Node>(target);
   }
 
   this.remove();
@@ -755,7 +751,7 @@ export function insertBefore<T extends Node>(
   this: Cheerio<T>,
   target: BasicAcceptedElems<Node>
 ): Cheerio<T> {
-  const targetArr = this._make<Node>(target, null, this._originalRoot);
+  const targetArr = this._make<Node>(target);
 
   this.remove();
 

src/api/traversing.spec.ts

@@ -1,5 +1,6 @@
 import cheerio from '../../src';
-import type { CheerioAPI, Cheerio } from '../cheerio';
+import { Cheerio } from '../cheerio';
+import type { CheerioAPI } from '../load';
 import { Node, Element, isText } from 'domhandler';
 import {
   food,
@@ -689,7 +690,7 @@ describe('$(...)', () => {
     it('() : should return an empty array', () => {
       const result = $('.orange').closest();
       expect(result).toHaveLength(0);
-      expect(result).toBeInstanceOf(cheerio);
+      expect(result).toBeInstanceOf(Cheerio);
     });
 
     it('(selector) : should find the closest element that matches the selector, searching through its ancestors and itself', () => {
@@ -1237,6 +1238,13 @@ describe('$(...)', () => {
         expect($selection[0]).toBe($fruits[0]);
         expect($selection[1]).toBe($orange[0]);
       });
+      it('is root object preserved', () => {
+        const $selection = $('<div></div>').add('#fruits');
+
+        expect($selection).toHaveLength(2);
+        expect($selection.eq(0).is('div')).toBe(true);
+        expect($selection.eq(1).is($fruits.eq(0))).toBe(true);
+      });
     });
     describe('(selector) matched elements :', () => {
       it('occur before the current selection', () => {

src/api/traversing.ts

@@ -8,6 +8,7 @@ import { Node, Element, hasChildren } from 'domhandler';
 import type { Cheerio } from '../cheerio';
 import * as select from 'cheerio-select';
 import { domEach, isTag, isCheerio } from '../utils';
+import { contains } from '../static';
 import { DomUtils } from 'htmlparser2';
 import type { FilterFunction, AcceptedFilters } from '../types';
 const { uniqueSort } = DomUtils;
@@ -42,7 +43,6 @@ export function find<T extends Node>(
   const context: Node[] = this.toArray();
 
   if (typeof selectorOrHaystack !== 'string') {
-    const { contains } = this.constructor as typeof Cheerio;
     const haystack = isCheerio(selectorOrHaystack)
       ? selectorOrHaystack.get()
       : [selectorOrHaystack];
@@ -941,11 +941,27 @@ export function get<T>(this: Cheerio<T>, i: number): T;
 export function get<T>(this: Cheerio<T>): T[];
 export function get<T>(this: Cheerio<T>, i?: number): T | T[] {
   if (i == null) {
-    return Array.prototype.slice.call(this);
+    return this.toArray();
   }
   return this[i < 0 ? this.length + i : i];
 }
 
+/**
+ * Retrieve all the DOM elements contained in the jQuery set as an array.
+ *
+ * @example
+ *
+ * ```js
+ * $('li').toArray();
+ * //=> [ {...}, {...}, {...} ]
+ * ```
+ *
+ * @returns The contained items.
+ */
+export function toArray<T>(this: Cheerio<T>): T[] {
+  return Array.prototype.slice.call(this);
+}
+
 /**
  * Search for a given element from among the matched elements.
  *

src/cheerio.spec.ts

@@ -215,11 +215,6 @@ describe('cheerio', () => {
     expect($elem.eq(1).attr('class')).toBe('orange');
   });
 
-  it('should gracefully degrade on complex, unmatched queries', () => {
-    const $elem = cheerio('Eastern States Cup #8-fin&nbsp;<1br>Downhill&nbsp;');
-    expect($elem).toHaveLength(0);
-  });
-
   it('(extended Array) should not interfere with prototype methods (issue #119)', () => {
     const extended: any = [];
     extended.find = extended.children = extended.each = function () {
@@ -275,6 +270,15 @@ describe('cheerio', () => {
       expect(lis).toHaveLength(3);
     });
 
+    it('should preserve root content', () => {
+      const $ = cheerio.load(fruits);
+      // Root should not be overwritten
+      const el = $('<div></div>');
+      expect(Object.is(el, el._root)).toBe(false);
+      // Query has to have results
+      expect($('li', 'ul')).toHaveLength(3);
+    });
+
     it('should allow loading a pre-parsed DOM', () => {
       const dom = parseDOM(food);
       const $ = cheerio.load(dom);