feat(common): PAYPAL-7 Pass in merchant ID on PayPal button script for PayPal Express Checkout

Author: bc-fetisov

src/script-loader.spec.ts

@@ -76,6 +76,18 @@ describe('ScriptLoader', () => {
             expect(document.body.appendChild)
                 .toHaveBeenCalledTimes(1);
         });
+
+        it('attaches script tag to document with data attributes', async () => {
+            await loader.loadScript(
+                'https://code.jquery.com/jquery-3.2.1.min.js',
+                {'data-attribute1': '1', 'data-attribute2': '2'});
+
+            expect(script.attributes.getNamedItem('data-attribute1')!.value)
+                .toEqual('1');
+
+            expect(script.attributes.getNamedItem('data-attribute2')!.value)
+                .toEqual('2');
+        });
     });
 
     describe('when script fails to load', () => {

src/script-loader.ts

@@ -10,6 +10,10 @@ export interface PreloadScriptOptions {
     prefetch: boolean;
 }
 
+export interface ScriptAttributes {
+    [key: string]: string;
+}
+
 export default class ScriptLoader {
     private _scripts: { [key: string]: Promise<void> } = {};
     private _preloadedScripts: { [key: string]: Promise<void> } = {};
@@ -22,12 +26,18 @@ export default class ScriptLoader {
         private _requestSender: RequestSender
     ) {}
 
-    loadScript(src: string, options?: LoadScriptOptions): Promise<void> {
+    loadScript(src: string, options?: LoadScriptOptions, scriptAttributes?: ScriptAttributes): Promise<void> {
         if (!this._scripts[src]) {
             this._scripts[src] = new Promise((resolve, reject) => {
                 const script = document.createElement('script') as LegacyHTMLScriptElement;
                 const { async = false } = options || {};
 
+                for (const key in scriptAttributes) {
+                    if (scriptAttributes.hasOwnProperty(key)) {
+                        script.setAttribute(key, scriptAttributes[key]);
+                    }
+                }
+
                 script.onload = () => resolve();
                 script.onreadystatechange = () => resolve();
                 script.onerror = event => {