Fix running babel and terser when there is no node in PATH. (#24450)

Fix running babel as part of the build when there is no node in PATH.
Fixes test other.test_wasm_features.

Author: juj

test/test_other.py

@@ -818,6 +818,7 @@ def test_em_config_filename(self):
     create_file('myconfig.py', f'''
       LLVM_ROOT = r'{config.LLVM_ROOT}'
       BINARYEN_ROOT = r'{config.BINARYEN_ROOT}'
+      NODE_JS = r'{config.NODE_JS[0]}'
       CACHE = r'{os.path.abspath("cache")}'
       print("filename", __file__)
     ''')
@@ -11882,7 +11883,7 @@ def print_percent(actual, expected):
       # N.b. this requires node in PATH, it does not run against NODE from
       # Emscripten config file. If you have this line fail, make sure 'node' is
       # visible in PATH.
-      self.run_process(terser + ['-b', 'beautify=true', 'a.js', '-o', 'pretty.js'])
+      self.run_process(terser + ['-b', 'beautify=true', 'a.js', '-o', 'pretty.js'], env=shared.env_with_node_in_path())
       self.assertFileContents(js_out, read_file('pretty.js'))
 
     obtained_results = {}

tools/building.py

@@ -535,7 +535,7 @@ def transpile(filename):
   # Babel needs access to `node_modules` for things like `preset-env`, but the
   # location of the config file (and the current working directory) might not be
   # in the emscripten tree, so we explicitly set NODE_PATH here.
-  env = os.environ.copy()
+  env = shared.env_with_node_in_path()
   env['NODE_PATH'] = path_from_root('node_modules')
   check_call(cmd, env=env)
   return outfile