'Typescript object parameter to type

With this code foo.bar is of type any. How do I change it to type of number?

  const foo = {} as any

  foo.bar = 4 as number

typescript

Solution 1:^[1]

You can define properties as optional if you are not sure which all properties will be there.

type Foo = {
  bar?: number
}

const foo: Foo = {}
foo.bar = 4

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Solution	Source
Solution 1	dhaker