Improved reliability of strictAssert

ts/components/StandaloneRegistration.tsx

@@ -184,7 +184,7 @@ export const StandaloneRegistration = ({
         return;
       }
 
-      strictAssert(number && code, 'Missing number or code');
+      strictAssert(number != null && code.length > 0, 'Missing number or code');
 
       try {
         await registerSingleDevice(number, code);

ts/services/profiles.ts

@@ -242,7 +242,7 @@ async function doGetProfile(c: ConversationModel): Promise<void> {
   let accessKey = c.get('accessKey');
   if (profileKey) {
     strictAssert(
-      profileKeyVersion && accessKey,
+      profileKeyVersion != null && accessKey != null,
       'profileKeyVersion and accessKey are derived from profileKey'
     );
 

ts/test-node/updater/differential_test.ts

@@ -163,7 +163,7 @@ describe('updater/differential', () => {
 
       server.listen(0, () => {
         const addr = server.address();
-        strictAssert(typeof addr === 'object' && addr, 'node.js apis');
+        strictAssert(typeof addr === 'object' && addr != null, 'node.js apis');
         baseUrl = `http://127.0.0.1:${addr.port}`;
 
         callback();

ts/textsecure/MessageReceiver.ts

@@ -2108,7 +2108,7 @@ export default class MessageReceiver
 
     if (msg.flags && msg.flags & Proto.DataMessage.Flags.PROFILE_KEY_UPDATE) {
       strictAssert(
-        msg.profileKey && msg.profileKey.length > 0,
+        msg.profileKey != null && msg.profileKey.length > 0,
         'PROFILE_KEY_UPDATE without profileKey'
       );
 

ts/util/assert.ts

@@ -38,11 +38,28 @@ export function assert(condition: unknown, message: string): asserts condition {
 /**
  * Throws an error if the condition is falsy, regardless of environment.
  */
-export function strictAssert(
-  condition: unknown,
+
+/**
+ * Asserts an expression is true.
+ *
+ * @param value - An expression to assert is true.
+ * @param message - An optional message for the assertion error thrown.
+ */
+export function strictAssert(value: boolean, message: string): asserts value;
+
+/**
+ * Asserts a nullable value is non-null.
+ *
+ * @param value - A nullable value to assert is non-null.
+ * @param message - An optional message for the assertion error thrown.
+ */
+export function strictAssert<T>(
+  value: T | null | undefined,
   message: string
-): asserts condition {
-  if (!condition) {
+): asserts value is T;
+
+export function strictAssert(condition: unknown, message: string): void {
+  if (condition === false || condition == null) {
     throw new Error(message);
   }
 }