init

physjax.js

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+//
+//  Initialize the MathJax startup code
+//
+require('mathjax-full/components/src/startup/lib/startup.js');
+
+//
+//  Get the loader module and indicate the modules that
+//  will be loaded by hand below
+//
+const {Loader} = require('mathjax-full/js/components/loader.js');
+Loader.preLoad(
+  'loader', 'startup',
+  'core',
+  'input/tex-base',
+  '[tex]/ams',
+  '[tex]/newcommand',
+  '[tex]/configmacros',
+  '[tex]/physics',
+  'output/svg', 'output/svg/fonts/tex.js',
+  'ui/menu'
+);
+
+//
+// Load the components that we want to combine into one component
+//   (the ones listed in the preLoad() call above)
+//
+require('mathjax-full/components/src/core/core.js');
+
+require('mathjax-full/components/src/input/tex-base/tex-base.js');
+require('mathjax-full/components/src/input/tex/extensions/ams/ams.js');
+require('mathjax-full/components/src/input/tex/extensions/newcommand/newcommand.js');
+require('mathjax-full/components/src/input/tex/extensions/configmacros/configmacros.js');
+
+require('mathjax-full/components/src/output/svg/svg.js');
+require('mathjax-full/components/src/output/svg/fonts/tex/tex.js');
+
+require('mathjax-full/components/src/ui/menu/menu.js');
+
+require('mathjax-full/components/src/input/tex/extensions/physics/physics.js');
+//
+// Update the configuration to include any updated values
+//
+const {insert} = require('mathjax-full/js/util/Options.js');
+insert(MathJax.config, {
+  tex: {
+    packages: {'[+]': ['ams', 'newcommand', 'configmacros','physics']}
+  }
+});
+
+//
+// Loading this component will cause all the normal startup
+//   operations to be performed
+//
+require('mathjax-full/components/src/startup/startup.js');

webpack.config.js

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+const PACKAGE = require('mathjax-full/components/webpack.common.js');
+
+module.exports = PACKAGE(
+  'physjax',                     // the name of the package to build
+  '../node_modules/mathjax-full/js',    // location of the mathjax library
+  [],                                   // packages to link to
+  __dirname,                            // our directory
+  '.'                                   // where to put the packaged component
+);