function watch() {
  gulp.watch(['src/*', 'src/adapters/*'], build);
  gulp.watch(['src/*', 'src/adapters/*'], buildJquery);
}
The UMD wrapper expects an exports() string for an expression the factory() should return,
and a namespace() string for a global value that should be set when no loader is present.
However, since jquery_pressure.js mutates $ several times instead of returning a value,
it does not need to use these features, so we set them to harmless no-ops.