Type ‘string’ has no properties in common with type ‘properties‘.

In this error message, TypeScript is stating that two types, ‘string’ and ‘properties‘, do not share any common properties.

To understand this error, let’s break it down:

1. ‘string’ – This is a built-in primitive type in TypeScript representing a sequence of characters. It can hold any textual data.

2. ‘properties‘ – This is a custom type that is being compared to the ‘string’ type. It represents properties with keys that can be either a ‘string’ or ‘number’ type, and their corresponding values must be of type ‘string’ at a minimum (‘string & {}’ denotes a string type).

Now, since ‘string’ and ‘properties‘ do not have any common properties, trying to access properties or perform operations that depend on the shared properties between these two types will result in an error.

Here’s an example to demonstrate this error:

const str: string = "Hello";
const prop: properties = {
  name: "John",
  age: 25,
};

console.log(str.length); // Valid - accessing the 'length' property of a 'string'
console.log(prop.length); // Invalid - 'length' property doesn't exist in properties

In the above example, accessing the ‘length’ property of the ‘str’ variable (of type ‘string’) is valid because ‘string’ has the ‘length’ property. However, trying to access the ‘length’ property of the ‘prop’ variable (of type ‘properties‘) will result in an error because the ‘length’ property doesn’t exist in ‘properties‘.