chore: upgrade xml-parser (#40)

Author: Amin Mahboubi

package.json

@@ -40,34 +40,33 @@
   },
   "dependencies": {
     "@braintree/sanitize-url": "^5.0.0",
-    "@rgrove/parse-xml": "^2.0.4",
+    "@rgrove/parse-xml": "^3.0.0",
     "@types/linkifyjs": "^2.1.3",
-    "@types/rgrove__parse-xml": "^1.1.1",
-    "dayjs": "^1.10.3",
+    "dayjs": "^1.10.4",
     "ical-expander": "^3.1.0",
     "linkifyjs": "^2.1.9",
     "react-markdown": "^5.0.3",
     "react-virtuoso": "^0.20.3"
   },
   "devDependencies": {
-    "@size-limit/preset-big-lib": "^4.9.1",
-    "@types/react": "^17.0.0",
-    "@types/react-dom": "^17.0.0",
-    "@types/react-test-renderer": "^17.0.0",
+    "@size-limit/preset-big-lib": "^4.9.2",
+    "@types/react": "^17.0.2",
+    "@types/react-dom": "^17.0.1",
+    "@types/react-test-renderer": "^17.0.1",
     "cssnano": "^4.1.10",
     "docz": "^2.3.1",
-    "gatsby-plugin-styled-components": "^3.8.0",
+    "gatsby-plugin-styled-components": "^3.10.0",
     "husky": "^4.3.8",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
     "react-test-renderer": "^17.0.1",
     "rollup-plugin-ignore-import": "^1.3.2",
     "rollup-plugin-scss": "^2.6.1",
-    "size-limit": "^4.9.1",
+    "size-limit": "^4.9.2",
     "styled-components": "^5.2.1",
     "tsdx": "^0.14.1",
     "tslib": "^2.1.0",
-    "typescript": "^4.1.3"
+    "typescript": "^4.1.5"
   },
   "husky": {
     "hooks": {

src/parser/MMLTag.ts

@@ -1,4 +1,8 @@
-import { Element as XmlElement, Text as XmlText } from '@rgrove/parse-xml';
+import { XmlElement, XmlText } from '@rgrove/parse-xml';
+
+function isXmlElement(node: XmlElement | XmlText): node is XmlElement {
+  return !!(node as XmlElement).children;
+}
 
 /**
  * MMLTag - Xml tag converted to this MMLTag
@@ -19,7 +23,7 @@ export class MMLTag {
 
   getText() {
     if (this.node.type === 'text') return this.node.text;
-    else if (this.node.children && this.node.children.length) return (this.node.children[0] as XmlText).text;
+    else if (isXmlElement(this.node) && this.node.children.length) return (this.node.children[0] as XmlText).text;
     return '';
   }