Update default minimum Node.js version in generated JS to 16.0.0 (#19192)

This version of node supports wasm-bigint by default, so it will help #19156

Node 16 is over 2 years old, and the node website already provides newer versions
both for latest and for LTS. 

This is possible after emscripten-core/emsdk#829 made
the emsdk install a 15.x version by default, and then
emscripten-core/emsdk#1232 switched to 16.x.

Author: kripken

ChangeLog.md

@@ -20,6 +20,10 @@ See docs/process.md for more on how version tagging works.
 
 3.1.42 (in development)
 -----------------------
+- The default minimum Node version of Emscripten output was bumped from 10.19 to
+  16.0. To run the output JS in an older version of node, you can use e.g.
+  `-sMIN_NODE_VERSION=101900` which will apply the previous minimum version of
+  10.19.0. (#19192).
 - The log message that emcc will sometime print (for example when auto-building
   system libraries) can now be completely supressed by running with
   `EMCC_LOGGING=0`.

src/settings.js

@@ -1797,7 +1797,7 @@ var MIN_CHROME_VERSION = 75;
 // distinct from the minimum version required run the emscripten compiler.
 // This version aligns with the current Ubuuntu TLS 20.04 (Focal).
 // Version is encoded in MMmmVV, e.g. 1814101 denotes Node 18.14.01.
-var MIN_NODE_VERSION = 101900;
+var MIN_NODE_VERSION = 160000;
 
 // Tracks whether we are building with errno support enabled. Set to 0
 // to disable compiling errno support in altogether. This saves a little

test/other/test_INCOMING_MODULE_JS_API.js.size

@@ -0,0 +1 @@
+4305

test/test_other.py

@@ -10646,7 +10646,9 @@ def test(args):
     # Changing this option to [] should decrease code size.
     self.assertLess(changed, normal)
     # Check an absolute code size as well, with some slack.
-    self.assertLess(abs(changed - 4491), 150)
+    self.check_expected_size_in_file('js',
+                                     test_file('other/test_INCOMING_MODULE_JS_API.js.size'),
+                                     changed)
 
   def test_INCOMING_MODULE_JS_API_missing(self):
     create_file('pre.js', '''
@@ -12362,22 +12364,22 @@ def test_node_unhandled_rejection(self):
 
     # With NODEJS_CATCH_REJECTION we expect the unhandled rejection to cause a non-zero
     # exit code and log the stack trace correctly.
-    self.run_process([EMCC, '--pre-js=pre.js', '-sNODEJS_CATCH_REJECTION', 'main.c'])
-    output = self.run_js('a.out.js', assert_returncode=NON_ZERO)
-    self.assertContained('unhandledRejection', read_file('a.out.js'))
+    self.build('main.c', emcc_args=['--pre-js=pre.js', '-sNODEJS_CATCH_REJECTION'])
+    output = self.run_js('main.js', assert_returncode=NON_ZERO)
+    self.assertContained('unhandledRejection', read_file('main.js'))
     self.assertContained('ReferenceError: missing is not defined', output)
     self.assertContained('at foo (', output)
 
     # Without NODEJS_CATCH_REJECTION we expect node to log the unhandled rejection
     # but return 0.
     self.node_args = [a for a in self.node_args if '--unhandled-rejections' not in a]
-    self.run_process([EMCC, '--pre-js=pre.js', '-sNODEJS_CATCH_REJECTION=0', 'main.c'])
-    self.assertNotContained('unhandledRejection', read_file('a.out.js'))
+    self.build('main.c', emcc_args=['--pre-js=pre.js', '-sNODEJS_CATCH_REJECTION=0'])
+    self.assertNotContained('unhandledRejection', read_file('main.js'))
 
     if shared.check_node_version()[0] >= 15:
       self.skipTest('old behaviour of node JS cannot be tested on node v15 or above')
 
-    output = self.run_js('a.out.js')
+    output = self.run_js('main.js')
     self.assertContained('ReferenceError: missing is not defined', output)
     self.assertContained('at foo (', output)