Code snippet to throw an error for Null or Undefined

I am writing this code snippet that should be helpful to you as a utility function.
It will throw an exact error for you when you want to assert, that something should not be null or undefined

export const shouldNotBeNull = (container: any) => {
const entries = Object.entries(container);
let error = '';
const getErrorMessage = (variable: string, token: string) =>
`${variable} should not be ${token}`;
const addError = (errorString: string) => (error += errorString);
for (let i = 0; i < entries.length; i++) {
let [key, value] = entries[i];
if (value === null) {
addError(getErrorMessage(key, 'null'));
}
if (value === undefined) {
addError(getErrorMessage(key, 'undefined'));
}
}
if (error.length > 0) {
throw new Error(error);
}
};

link to gist
Thank you!