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How to create an interface to type check an object based on the keys entered in another object.

For example:

const myObject = {
  colors: {
    black: '#000',
    white: '#fff'
  },
  palette: {
    primary: 'black',
    secondary: 'orange' // <- should give an error because orange does not exist in colors object
  }
};
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  • 1
    There is no specific interface in TypeScript which works this way. You could take this approach and represent your object type as a generic constraint, using an asMyObject() helper function to infer the generic type. Does that meet your needs? If so I can write up an answer; if not, please let me know what I'm missing about your use cases. Commented Jan 9, 2022 at 1:57

1 Answer 1

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Here is one way

const colors = {
  black: '#000',
  white: '#fff'
};

const palette: Record<string, keyof typeof colors> = {
  primary: 'black',
  secondary: 'white'
};

const myObject = {
  colors,
  palette
};
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