null and undefined do not allow property access using the dot operator, meaning that null.whatever will never work. Therefore, achieving what you are looking for is not possible. For more information, refer to this source.
In addition, most built-in methods, such as indexOf, do not support bindings with null. Hence, ''.indexOf.call(null,...) will also not work.
I understand the reasoning behind your query - having methods on null values can be beneficial in scenarios like "map-invoke" contexts, where:
source.map(x => x.someMethod())
You may want to return a default value for nulls or undefineds that might appear in the source. Unfortunately, there does not seem to be a concise way of doing this; you will need to implement a safety wrapper for potential nulls:
source.map(x => invoke(x, func))
Here, invoke could be something similar to
return x === null ? null : func.apply(x)
For example:
let isNull = x => x === null || typeof x === 'undefined';
let invoke = (func, ...args) => x => isNull(x) ? null : func.apply(x, args);
a = ['foo', 'bar', null, 'bbaazz'];
// z = a.map(x => x.indexOf('a')) // this will fail
z = a.map(invoke(''.indexOf, 'a')); // this works
console.log(z);