A match made in heaven

• Type What?

JavaScript

let foo = 123;

TypeScript

let foo = 123;

JavaScript

foo = 123;

TypeScript

foo = 123;

Error : Cannot find name 'foo'

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Linter on steroids

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Type Info

function iPityTheFoo(foo) {
  console.log(foo.bar + 123);
}

iPityTheFoo({foo:123});

Type Info

function iPityTheFoo(foo: { bar: number }) {
  console.log(foo.bar + 123);
}

// Error property `bar` missing
iPityTheFoo({ foo: 123 }); 

Type Info

function iPityTheFoo(foo: { bar: number }) {
  console.log(foo.bar + 123);
}

// Error property `bar` not number
iPityTheFoo({ bar: '123' }); 

Type Info

function iPityTheFoo(foo: { bar: number }) {
  console.log(foo.bar + 123);
}

// Okay
iPityTheFoo({ bar: 123 }); 

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