feat: splitting openAPI specs by version (twilio#104)

* Splitting API specs by version

* Adding comments

* Deleting preview.jsons

* Updated with right version of api-definitions

* Added test for mergeDomains func

* Adding back preview.json

* Added test for preview

Co-authored-by: shwetharadhakrishna <sradhakrishna@twilio.com>

src/services/twilio-api/api-browser.js

@@ -9,10 +9,31 @@ const OPERATIONS = ['post', 'get', 'delete'];
 class TwilioApiBrowser {
   constructor(spec) {
     spec = spec || this.loadApiSpecFromDisk();
-
+    spec = this.mergeVersions(spec);
     this.domains = this.loadDomains(spec);
   }
 
+  mergeVersions(spec) {
+    // merge the domain_versions into a single domain
+    const mergedSpec = {};
+    for (const domainNameWithVersion in spec) {
+      if (spec.hasOwnProperty(domainNameWithVersion)) {
+        const domainName = domainNameWithVersion.split('_')[0];
+        if (domainName in mergedSpec) {
+          const existing = mergedSpec[domainName];
+          const current = spec[domainNameWithVersion];
+          Object.assign(existing.components.schemas, current.components.schemas);
+          Object.assign(existing.paths, current.paths);
+          mergedSpec[domainName] = existing;
+        } else {
+          mergedSpec[domainName] = spec[domainNameWithVersion];
+        }
+      }
+    }
+
+    return mergedSpec;
+  }
+
   loadApiSpecFromDisk() {
     if (!apiSpec) {
       const specPattern = /twilio_(.+)\.json/;