fix: give more descriptive error for accountSid init issues

.eslintrc.json

@@ -117,7 +117,7 @@
     ],
     "quotes": [
       2,
-      "single"
+      "double"
     ],
     "indent": [
       2,

.jshintrc

@@ -44,7 +44,7 @@
   "newcap": true,
 
   // Enforce use of single quotation marks for strings.
-  "quotmark": "single",
+  "quotmark": "double",
 
   // Enforce placing 'use strict' at the top function scope
   "strict": true,

lib/base/BaseTwilio.ts

@@ -88,7 +88,11 @@ export class BaseTwilio {
     }
 
     if (!this.accountSid?.startsWith("AC")) {
-      throw new Error("accountSid must start with AC");
+      const apiKeyMsg = this.accountSid.startsWith("SK")
+        ? ". The given SID indicates an API Key which requires the accountSid to be passed as an additional option"
+        : "";
+
+      throw new Error("accountSid must start with AC" + apiKeyMsg);
     }
   }
 

spec/unit/rest/Twilio.spec.js

@@ -1,17 +1,38 @@
 "use strict";
 const nock = require("nock");
-const util = require("util");
-var moduleInfo = require("../../../package.json");
-var os = require("os");
-var url = require("url"); /* jshint ignore:line */
 
 describe("client", () => {
-  var client;
-  const twilio = require("../../../lib");
+  let client;
+  const Twilio = require("../../../lib");
+
+  describe("initializing", () => {
+    it("should use the first arg for the username as well", () => {
+      client = new Twilio("ACXXXXXXXX", "test-password");
+      expect(client.username).toEqual("ACXXXXXXXX");
+      expect(client.accountSid).toEqual("ACXXXXXXXX");
+    });
+
+    it("should use the first arg for the username as well and the option as the accountSid", () => {
+      client = new Twilio("SKXXXXXXXX", "test-password", {
+        accountSid: "ACXXXXXXXX",
+      });
+      expect(client.username).toEqual("SKXXXXXXXX");
+      expect(client.accountSid).toEqual("ACXXXXXXXX");
+    });
+
+    it("should throw given an invalid accountSid", () => {
+      expect(() => new Twilio("ADXXXXXXXX", "test-password")).toThrow(
+        "must start with"
+      );
+      expect(() => new Twilio("SKXXXXXXXX", "test-password")).toThrow(
+        "API Key"
+      );
+    });
+  });
 
   describe("setting region and edge", () => {
     beforeEach(() => {
-      client = new twilio("ACXXXXXXXX", "test-password");
+      client = new Twilio("ACXXXXXXXX", "test-password");
     });
     describe("setting the region", () => {
       it("should use no region or edge by default", () => {
@@ -112,7 +133,7 @@ describe("client", () => {
 
   describe("adding user agent extensions", () => {
     it("sets the user-agent by default", () => {
-      const client = new twilio("ACXXXXXXXX", "test-password");
+      const client = new Twilio("ACXXXXXXXX", "test-password");
       const scope = nock("https://api.twilio.com", {
         reqheaders: {
           "User-Agent":
@@ -127,7 +148,7 @@ describe("client", () => {
     });
 
     it("allows for user-agent extensions", () => {
-      const client = new twilio("ACXXXXXXXX", "test-password", {
+      const client = new Twilio("ACXXXXXXXX", "test-password", {
         userAgentExtensions: [
           "twilio-run/2.0.0-test",
           "@twilio-labs/plugin-serverless/1.1.0-test",