Use initial year for copyright notice

Author: kripken

tests/test_other.py

@@ -9712,10 +9712,10 @@ def test_emscripten_license(self, expect_license, args):
     run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c')] + args)
     with open('a.out.js') as f:
       js = f.read()
-    self.assertContainedIf('Copyright 2020 Emscripten authors', js, expect_license)
+    self.assertContainedIf('Copyright 2010 Emscripten authors', js, expect_license)
     self.assertContainedIf('SPDX-License-Identifier: MIT', js, expect_license)
     if expect_license:
-      self.assertEqual(js.count('Copyright 2020 Emscripten authors'), 1)
+      self.assertEqual(js.count('Copyright 2010 Emscripten authors'), 1)
 
   def test_add_emscripten_metadata_not_emitted(self):
     run_process([PYTHON, EMCC, path_from_root('tests', 'hello_world.c'),

tools/shared.py

@@ -3004,15 +3004,15 @@ class JS(object):
   emscripten_license = '''\
 /**
  * @license
- * Copyright 2020 Emscripten authors
+ * Copyright 2010 Emscripten authors
  * SPDX-License-Identifier: MIT
  */
 '''
 
   closured_emscripten_license = '''\
 /*
 
- Copyright 2020 The Emscripten Authors
+ Copyright 2010 The Emscripten Authors
  SPDX-License-Identifier: MIT
 */
 '''