The way wp_localize_script()
is supposed to be used is for that 2nd argument to be your namespace. Then you put an array as the 3rd argument for the values:
wp_localize_script(
'my-script',
'namespace_name',
array(
'var_name' => $var,
)
);
Now you can access the variable in the script with namespace_name.var_name
.
If you also use the namespace in your script, instead of initialising the object, retrieve the object created by WordPress (or fall back to a new object if it’s missing) and add to it:
var namespace_name = window.namespace_name || {};
namespace_name.new_var="Hello world!";