[embind] Always enable assertions during TypeScript generation. (#21695)

Fixes #21641

src/embind/embind_gen.js

@@ -476,8 +476,9 @@ var LibraryEmbind = {
         }
         argStart = 2;
       }
-      if (argsName.length)
-        assert(argsName.length == (argTypes.length - hasThis - 1), 'Argument names should match number of parameters.');
+      if (argsName.length && argsName.length != (argTypes.length - hasThis - 1))
+        throw new Error('Argument names should match number of parameters.');
+
       const args = [];
       for (let i = argStart, x = 0; i < argTypes.length; i++) {
         if (x < argsName.length) {
@@ -619,7 +620,9 @@ var LibraryEmbind = {
                                             setterContext) {
     fieldName = readLatin1String(fieldName);
     const readonly = setter === 0;
-    assert(readonly || getterReturnType === setterArgumentType, 'Mismatched getter and setter types are not supported.');
+    if (!(readonly || getterReturnType === setterArgumentType))
+      throw new error('Mismatched getter and setter types are not supported.');
+
     whenDependentTypesAreResolved([], [classType], function(classType) {
       classType = classType[0];
       whenDependentTypesAreResolved([], [getterReturnType], function(types) {
@@ -720,7 +723,9 @@ var LibraryEmbind = {
     setterContext
   ) {
     const valueArray = tupleRegistrations[rawTupleType];
-    assert(getterReturnType === setterArgumentType, 'Mismatched getter and setter types are not supported.');
+    if (getterReturnType !== setterArgumentType)
+      throw new Error('Mismatched getter and setter types are not supported.');
+
     valueArray.elementTypeIds.push(getterReturnType);
   },
   _embind_finalize_value_array__deps: ['$whenDependentTypesAreResolved', '$moduleDefinitions', '$tupleRegistrations'],
@@ -761,7 +766,9 @@ var LibraryEmbind = {
     setterContext
   ) {
     const valueObject = structRegistrations[structType];
-    assert(getterReturnType === setterArgumentType, 'Mismatched getter and setter types are not supported.');
+    if (getterReturnType !== setterArgumentType)
+      throw new Error('Mismatched getter and setter types are not supported.');
+
     valueObject.fieldTypeIds.push(getterReturnType);
     valueObject.fieldNames.push(readLatin1String(fieldName));
   },
@@ -822,10 +829,10 @@ var LibraryEmbind = {
 #endif
 
   // Stub functions used by eval, but not needed for TS generation:
-  $makeLegalFunctionName: () => assert(false, 'stub function should not be called'),
-  $newFunc: () => assert(false, 'stub function should not be called'),
-  $runDestructors: () => assert(false, 'stub function should not be called'),
-  $createNamedFunction: () => assert(false, 'stub function should not be called'),
+  $makeLegalFunctionName: () => { throw new Error('stub function should not be called'); },
+  $newFunc: () => { throw new Error('stub function should not be called'); },
+  $runDestructors: () => { throw new Error('stub function should not be called'); },
+  $createNamedFunction: () => { throw new Error('stub function should not be called'); },
 };
 
 #if EMBIND_AOT

test/test_other.py

@@ -3384,7 +3384,9 @@ def test_embind_tsgen_ignore(self):
     extra_args = ['-sMODULARIZE',
                   '--embed-file', 'fail.js',
                   '-sMINIMAL_RUNTIME=2',
-                  '-sEXPORT_ES6=1']
+                  '-sEXPORT_ES6=1',
+                  '-sASSERTIONS=0',
+                  '-sSTRICT=1']
     self.emcc(test_file('other/embind_tsgen.cpp'), extra_args)
     self.assertFileContents(test_file('other/embind_tsgen_ignore_2.d.ts'), read_file('embind_tsgen.d.ts'))
     # Also test this separately since it conflicts with other settings.