Adds types for version 2.0 of svg-parser (#38474)

* Adds types for new version of svg-parser

* Added whitespace for union types

* Update types with feedback from mrmlnc

* Re-write test to conform with new definitions

types/svg-parser/index.d.ts

@@ -1,14 +1,29 @@
-// Type definitions for svg-parser 1.0
-// Project: https://gitlab.com/Rich-Harris/svg-parser#README
+// Type definitions for svg-parser 2.0
+// Project: https://github.com/Rich-Harris/svg-parser
 // Definitions by: mrmlnc <https://github.com/mrmlnc>
+//                 Joel Shinness <https://github.com/JoelCodes>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.1
 
-export interface Node {
-    name: string;
-    attributes: Record<string, string | number>;
-    children: Node[];
+export interface TextNode {
+    type: 'text';
+    value?: string | boolean | number;
+}
+
+export interface ElementNode {
+    type: 'element';
+    tagName?: string;
+    properties?: Record<string, string|number>;
+    children: Array<Node | string>;
+    value?: string;
     metadata?: string;
 }
 
-export function parse(content: string): Node;
+export type Node = TextNode | ElementNode;
+
+export interface RootNode {
+    type: 'root';
+    children: Node;
+}
+
+export function parse(source: string): RootNode;

types/svg-parser/svg-parser-tests.ts

@@ -1,4 +1,4 @@
 import * as parser from 'svg-parser';
 
-// $ExpectType Node
+// $ExpectType RootNode
 parser.parse('<svg></svg>');