diff --git a/src/lib/libcore.js b/src/lib/libcore.js
index d12417541f737..0bbe7c27736d3 100644
--- a/src/lib/libcore.js
+++ b/src/lib/libcore.js
@@ -1967,42 +1967,16 @@ addToLibrary({
   _emscripten_get_progname__deps: ['$getExecutableName', '$stringToUTF8'],
   _emscripten_get_progname: (str, len) => stringToUTF8(getExecutableName(), str, len),
 
-  emscripten_console_log: (str) => {
-#if ASSERTIONS
-    assert(typeof str == 'number');
-#endif
-    console.log(UTF8ToString(str));
-  },
-
-  emscripten_console_warn: (str) => {
-#if ASSERTIONS
-    assert(typeof str == 'number');
-#endif
-    console.warn(UTF8ToString(str));
-  },
-
-  emscripten_console_error: (str) => {
-#if ASSERTIONS
-    assert(typeof str == 'number');
-#endif
-    console.error(UTF8ToString(str));
-  },
-
-  emscripten_console_trace: (str) => {
-#if ASSERTIONS
-    assert(typeof str == 'number');
-#endif
-    console.trace(UTF8ToString(str));
-  },
+  emscripten_console_log: (str) => console.log(UTF8ToString(str)),
+  emscripten_console_warn: (str) => console.warn(UTF8ToString(str)),
+  emscripten_console_error: (str) => console.error(UTF8ToString(str)),
+  emscripten_console_trace: (str) => console.trace(UTF8ToString(str)),
 
   emscripten_throw_number: (number) => {
     throw number;
   },
 
   emscripten_throw_string: (str) => {
-#if ASSERTIONS
-    assert(typeof str == 'number');
-#endif
     throw UTF8ToString(str);
   },
 
@@ -2185,7 +2159,7 @@ addToLibrary({
 
   $alignMemory: (size, alignment) => {
 #if ASSERTIONS
-    assert(alignment, "alignment argument is required");
+    assert(alignment, 'alignment argument is required');
 #endif
     return Math.ceil(size / alignment) * alignment;
   },
diff --git a/test/codesize/hello_world_wasm.expected.js b/test/codesize/hello_world_wasm.expected.js
index dd8856ad90787..d5e4d676b54d1 100644
--- a/test/codesize/hello_world_wasm.expected.js
+++ b/test/codesize/hello_world_wasm.expected.js
@@ -8,7 +8,7 @@ WebAssembly.instantiate(d.wasm, {
                 for (var b = a, l = e, m = b + void 0; l[b] && !(b >= m); ) ++b;
                 a = f.decode(e.subarray(a, b));
             } else a = "";
-            k.call(c, a);
+            return k.call(c, a);
         }
     }
 }).then((a => {
diff --git a/test/codesize/hello_world_wasm2js.expected.js b/test/codesize/hello_world_wasm2js.expected.js
index 67398d58d9e21..f450fc6d41386 100644
--- a/test/codesize/hello_world_wasm2js.expected.js
+++ b/test/codesize/hello_world_wasm2js.expected.js
@@ -51,7 +51,7 @@ function e(a) {
                 for (var n = a, c = g, f = n + void 0; c[n] && !(n >= f); ) ++n;
                 a = h.decode(g.subarray(a, n));
             } else a = "";
-            u.call(q, a);
+            return u.call(q, a);
         }
     }
 }).then((a => {
diff --git a/test/codesize/test_codesize_hello_dylink_all.json b/test/codesize/test_codesize_hello_dylink_all.json
index 8c6a7d7dc015b..8cdb5bf97f9bc 100644
--- a/test/codesize/test_codesize_hello_dylink_all.json
+++ b/test/codesize/test_codesize_hello_dylink_all.json
@@ -1,7 +1,7 @@
 {
-  "a.out.js": 267889,
+  "a.out.js": 267881,
   "a.out.nodebug.wasm": 587151,
-  "total": 855040,
+  "total": 855032,
   "sent": [
     "IMG_Init",
     "IMG_Load",
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_world_wasm.json b/test/codesize/test_minimal_runtime_code_size_hello_world_wasm.json
index cbc776e272b48..5a3d9867adb99 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_world_wasm.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_world_wasm.json
@@ -1,10 +1,10 @@
 {
   "a.html": 548,
   "a.html.gz": 371,
-  "a.js": 287,
-  "a.js.gz": 242,
+  "a.js": 294,
+  "a.js.gz": 247,
   "a.wasm": 95,
   "a.wasm.gz": 101,
-  "total": 930,
-  "total_gz": 714
+  "total": 937,
+  "total_gz": 719
 }
diff --git a/test/codesize/test_minimal_runtime_code_size_hello_world_wasm2js.json b/test/codesize/test_minimal_runtime_code_size_hello_world_wasm2js.json
index 2c0a2455dba6f..e00d3e78ab55d 100644
--- a/test/codesize/test_minimal_runtime_code_size_hello_world_wasm2js.json
+++ b/test/codesize/test_minimal_runtime_code_size_hello_world_wasm2js.json
@@ -1,8 +1,8 @@
 {
   "a.html": 319,
   "a.html.gz": 243,
-  "a.js": 965,
-  "a.js.gz": 588,
-  "total": 1284,
-  "total_gz": 831
+  "a.js": 972,
+  "a.js.gz": 590,
+  "total": 1291,
+  "total_gz": 833
 }