Don't inject assertions onto the ready promise (emscripten-core#23176)

This is a debug feature that means users who did not await the promise
and tried to access stuff directly on it would see a nice error message.

However with the advent of more usage of async/await, for example in
\emscripten-core#23157 it is not always the ready promise that gets returned to the
user but a language-generated promise from an `await` call.

We could try to jump through more hoops to continue to support this
debug feature, but I don't think added complexity in the toolchain or
the generated code would be worth it.

Split out from emscripten-core#23157.

src/parseTools.mjs

@@ -971,34 +971,6 @@ function to64(x) {
   return `BigInt(${x})`;
 }
 
-// Add assertions to catch common errors when using the Promise object we
-// return from MODULARIZE Module() invocations.
-function addReadyPromiseAssertions() {
-  // Warn on someone doing
-  //
-  //  var instance = Module();
-  //  ...
-  //  instance._main();
-  const properties = Array.from(EXPORTED_FUNCTIONS.values());
-  // Also warn on onRuntimeInitialized which might be a common pattern with
-  // older MODULARIZE-using codebases.
-  properties.push('onRuntimeInitialized');
-  const warningEnding =
-    ' on the Promise object, instead of the instance. Use .then() to get called back with the instance, see the MODULARIZE docs in src/settings.js';
-  const res = JSON.stringify(properties);
-  return (
-    res +
-    `.forEach((prop) => {
-  if (!Object.getOwnPropertyDescriptor(readyPromise, prop)) {
-    Object.defineProperty(readyPromise, prop, {
-      get: () => abort('You are getting ' + prop + '${warningEnding}'),
-      set: () => abort('You are setting ' + prop + '${warningEnding}'),
-    });
-  }
-});`
-  );
-}
-
 function asyncIf(condition) {
   return condition ? 'async' : '';
 }
@@ -1118,7 +1090,6 @@ addToCompileTimeContext({
   ENVIRONMENT_IS_WORKER_THREAD,
   addAtExit,
   addAtInit,
-  addReadyPromiseAssertions,
   asyncIf,
   awaitIf,
   buildStringArray,

src/shell.js

@@ -47,9 +47,6 @@ var readyPromise = new Promise((resolve, reject) => {
   readyPromiseResolve = resolve;
   readyPromiseReject = reject;
 });
-#if ASSERTIONS
-{{{ addReadyPromiseAssertions() }}}
-#endif
 #endif
 
 // Determine the runtime environment we are in. You can customize this by

src/shell_minimal.js

@@ -41,9 +41,6 @@ var readyPromise = new Promise((resolve, reject) => {
   readyPromiseResolve = resolve;
   readyPromiseReject = reject;
 });
-#if ASSERTIONS
-{{{ addReadyPromiseAssertions() }}}
-#endif
 #endif
 
 #if ENVIRONMENT_MAY_BE_NODE

test/test_other.py

@@ -11962,31 +11962,6 @@ def test_assertions_on_outgoing_module_api_changes(self):
 '''
     self.do_runf('src.cpp', expected, emcc_args=['-sASSERTIONS'])
 
-  def test_modularize_assertions_on_ready_promise(self):
-    # check that when assertions are on we give useful error messages for
-    # mistakenly thinking the Promise is an instance. I.e., once you could do
-    # Module()._main to get an instance and the main function, but after
-    # the breaking change in #10697 Module() now returns a promise, and to get
-    # the instance you must use .then() to get a callback with the instance.
-    create_file('test.js', r'''
-      try {
-        Module()._main;
-      } catch(e) {
-        console.log(e);
-      }
-      try {
-        Module().onRuntimeInitialized = 42;
-      } catch(e) {
-        console.log(e);
-      }
-    ''')
-    self.run_process([EMCC, test_file('hello_world.c'), '-sMODULARIZE', '-sASSERTIONS', '--extern-post-js', 'test.js'])
-    # A return code of 1 is from an uncaught exception not handled by
-    # the domain or the 'uncaughtException' event handler.
-    out = self.run_js('a.out.js', assert_returncode=1)
-    self.assertContained('You are getting _main on the Promise object, instead of the instance. Use .then() to get called back with the instance, see the MODULARIZE docs in src/settings.js', out)
-    self.assertContained('You are setting onRuntimeInitialized on the Promise object, instead of the instance. Use .then() to get called back with the instance, see the MODULARIZE docs in src/settings.js', out)
-
   def test_modularize_assertions_on_reject_promise(self):
     # Check that there is an uncaught exception in modularize mode.
     # Once we added an `uncaughtException` handler to the global process