type A = {
    name:string;
    age:number;
}
type B = {
    name:string
}
declare let a:A
declare let b: B
b = a

let b: {
    name:string
}
b ={name:'1',age:1}
/* 
  Type '{ name: string; age: number; }' is not assignable to type '{ name: string; }'.
  Object literal may only specify known properties, and 'age' does not exist in type '{ name: string; }'
*/
function freshness({name}:{name:string}){
    return 1
}
freshness({name:'du',age:1}); 
/*
  Argument of type '{ name: string; age: number; }' is not assignable to parameter of type '{ name: string; }'.
  Object literal may only specify known properties, and 'age' does not exist in type '{ name: string; }'
*/

function logName(something: { name: string }) {
  console.log(something.name);
}
logName({ name: 'matt', job: 'being awesome' })

interface TextOptions {
    alignment?: string;
    color?: string;
    padding?: number;
}
function drawText(opts: TextOptions) { ... }
// None of these were errors before
drawText({ align: 'center' }); // Oops
drawText({ colour: 'grey' }); // Oops
drawText({ pading: 32}); // Oops

var x: { foo: number };
x = { foo: 1, baz: 2 };  // Error, excess property `baz`
var y: { foo: number, bar?: number };
y = { foo: 1, baz: 2 };  // Error, excess or misspelled property `baz`

var x: { foo: number };
x1 = { foo: 1, baz: 2 };
x = x1;
var y: { foo: number, bar?: number };
y1 = { foo: 1, baz: 2 };
y = y1;