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js_manipulation.py

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 warn_python_launcher

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js_manipulation.py

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# Copyright 2020 The Emscripten Authors. All rights reserved.

# Emscripten is available under two separate licenses, the MIT license and the

# University of Illinois/NCSA Open Source License. Both these licenses can be

# found in the LICENSE file.

from . import shared

def add_files_pre_js(user_pre_js, files_pre_js):

# the normal thing is to just combine the pre-js content

if not shared.Settings.ASSERTIONS:

return files_pre_js + user_pre_js

# if a user pre-js tramples the file code's changes to Module.preRun

# that could be confusing. show a clear error at runtime if assertions are

# enabled

return files_pre_js + '''

// All the pre-js content up to here must remain later on, we need to run

// it.

var necessaryPreJSTasks = Module['preRun'].slice();

''' + user_pre_js + '''

if (!Module['preRun']) throw 'Module.preRun should exist because file support used it; did a pre-js delete it?';

necessaryPreJSTasks.forEach(function(task) {

if (Module['preRun'].indexOf(task) < 0) throw 'All preRun tasks that exist before user pre-js code should remain after; did you replace Module or modify Module.preRun?';

});

'''