[TS migration] Migrate 'SelectionScraper' lib to TypeScript

src/libs/SelectionScraper/index.native.ts

@@ -0,0 +1,8 @@
+import GetCurrentSelection from './types';
+
+// This is a no-op function for native devices because they wouldn't be able to support Selection API like a website.
+const getCurrentSelection: GetCurrentSelection = () => '';
+
+export default {
+    getCurrentSelection,
+};

src/libs/SelectionScraper/index.js → src/libs/SelectionScraper/index.ts

@@ -1,25 +1,29 @@
 import render from 'dom-serializer';
 import {parseDocument} from 'htmlparser2';
-import _ from 'underscore';
 import Str from 'expensify-common/lib/str';
+import {DataNode, Element, Node} from 'domhandler';
 import CONST from '../../CONST';
+import GetCurrentSelection from './types';
 
 const elementsWillBeSkipped = ['html', 'body'];
 const tagAttribute = 'data-testid';
 
 /**
  * Reads html of selection. If browser doesn't support Selection API, returns empty string.
- * @returns {String} HTML of selection as String
+ * @returns HTML of selection as String
  */
-const getHTMLOfSelection = () => {
+const getHTMLOfSelection = (): string => {
     // If browser doesn't support Selection API, return an empty string.
     if (!window.getSelection) {
         return '';
     }
     const selection = window.getSelection();
+    if (!selection) {
+        return '';
+    }
 
     if (selection.rangeCount <= 0) {
-        return window.getSelection().toString();
+        return window.getSelection()?.toString() ?? '';
     }
 
     const div = document.createElement('div');
@@ -44,7 +48,7 @@ const getHTMLOfSelection = () => {
 
         // If clonedSelection has no text content this data has no meaning to us.
         if (clonedSelection.textContent) {
-            let parent;
+            let parent: globalThis.Element | null = null;
             let child = clonedSelection;
 
             // If selection starts and ends within same text node we use its parentNode. This is because we can't
@@ -65,16 +69,16 @@ const getHTMLOfSelection = () => {
             if (range.commonAncestorContainer instanceof HTMLElement) {
                 parent = range.commonAncestorContainer.closest(`[${tagAttribute}]`);
             } else {
-                parent = range.commonAncestorContainer.parentNode.closest(`[${tagAttribute}]`);
+                parent = (range.commonAncestorContainer.parentNode as HTMLElement | null)?.closest(`[${tagAttribute}]`) ?? null;
             }
 
             // Keep traversing up to clone all parents with 'data-testid' attribute.
             while (parent) {
                 const cloned = parent.cloneNode();
                 cloned.appendChild(child);
-                child = cloned;
+                child = cloned as DocumentFragment;
 
-                parent = parent.parentNode.closest(`[${tagAttribute}]`);
+                parent = (parent.parentNode as HTMLElement | null)?.closest(`[${tagAttribute}]`) ?? null;
             }
 
             div.appendChild(child);
@@ -96,40 +100,41 @@ const getHTMLOfSelection = () => {
 
 /**
  * Clears all attributes from dom elements
- * @param {Object} dom htmlparser2 dom representation
- * @param {Boolean} isChildOfEditorElement
- * @returns {Object} htmlparser2 dom representation
+ * @param dom - dom htmlparser2 dom representation
  */
-const replaceNodes = (dom, isChildOfEditorElement) => {
-    let domName = dom.name;
-    let domChildren;
-    const domAttribs = {};
-    let data;
+const replaceNodes = (dom: Node, isChildOfEditorElement: boolean): Node => {
+    let domName;
+    let domChildren: Node[] = [];
+    const domAttribs: Element['attribs'] = {};
+    let data = '';
 
     // Encoding HTML chars '< >' in the text, because any HTML will be removed in stripHTML method.
-    if (dom.type === 'text') {
+    if (dom.type.toString() === 'text' && dom instanceof DataNode) {
         data = Str.htmlEncode(dom.data);
-    }
-
-    // We are skipping elements which has html and body in data-testid, since ExpensiMark can't parse it. Also this data
-    // has no meaning for us.
-    if (dom.attribs && dom.attribs[tagAttribute]) {
-        if (!elementsWillBeSkipped.includes(dom.attribs[tagAttribute])) {
-            domName = dom.attribs[tagAttribute];
+    } else if (dom instanceof Element) {
+        domName = dom.name;
+        // We are skipping elements which has html and body in data-testid, since ExpensiMark can't parse it. Also this data
+        // has no meaning for us.
+        if (dom.attribs?.[tagAttribute]) {
+            if (!elementsWillBeSkipped.includes(dom.attribs[tagAttribute])) {
+                domName = dom.attribs[tagAttribute];
+            }
+        } else if (dom.name === 'div' && dom.children.length === 1 && isChildOfEditorElement) {
+            // We are excluding divs that are children of our editor element and have only one child to prevent
+            // additional newlines from being added in the HTML to Markdown conversion process.
+            return replaceNodes(dom.children[0], isChildOfEditorElement);
         }
-    } else if (dom.name === 'div' && dom.children.length === 1 && isChildOfEditorElement) {
-        // We are excluding divs that are children of our editor element and have only one child to prevent
-        // additional newlines from being added in the HTML to Markdown conversion process.
-        return replaceNodes(dom.children[0], isChildOfEditorElement);
-    }
 
-    // We need to preserve href attribute in order to copy links.
-    if (dom.attribs && dom.attribs.href) {
-        domAttribs.href = dom.attribs.href;
-    }
+        // We need to preserve href attribute in order to copy links.
+        if (dom.attribs?.href) {
+            domAttribs.href = dom.attribs.href;
+        }
 
-    if (dom.children) {
-        domChildren = _.map(dom.children, (c) => replaceNodes(c, isChildOfEditorElement || !_.isEmpty(dom.attribs && dom.attribs[tagAttribute])));
+        if (dom.children) {
+            domChildren = dom.children.map((c) => replaceNodes(c, isChildOfEditorElement || !!dom.attribs?.[tagAttribute]));
+        }
+    } else {
+        throw new Error(`Unknown dom type: ${dom.type}`);
     }
 
     return {
@@ -138,16 +143,15 @@ const replaceNodes = (dom, isChildOfEditorElement) => {
         name: domName,
         attribs: domAttribs,
         children: domChildren,
-    };
+    } as Element & DataNode;
 };
 
 /**
  * Resolves the current selection to values and produces clean HTML.
- * @returns {String} resolved selection in the HTML format
  */
-const getCurrentSelection = () => {
+const getCurrentSelection: GetCurrentSelection = () => {
     const domRepresentation = parseDocument(getHTMLOfSelection());
-    domRepresentation.children = _.map(domRepresentation.children, replaceNodes);
+    domRepresentation.children = domRepresentation.children.map((item) => replaceNodes(item, false));
 
     // Newline characters need to be removed here because the HTML could contain both newlines and <br> tags, and when
     // <br> tags are converted later to markdown, it creates duplicate newline characters. This means that when the content

src/libs/SelectionScraper/types.ts

@@ -0,0 +1,3 @@
+type GetCurrentSelection = () => string;
+
+export default GetCurrentSelection;