Typescript How to update every object value

Question

I have a object like this:

enum FeatureNames = {
  featureA = 'featureA',
  featureB = 'featureB',
  featureC = 'featureC'
}

interface FeatureDetails {
  on: boolean;
}

type Features = Record<FeatureNames,FeatureDetails>;

const myObj: Features = {
  [FeatureNames.featureA]: {
    on: true
  },
  [FeatureNames.featureB]: {
    on: false
  },
  [FeatureNames.featureC]: {
    on: false
  }
}

How can I update the value of every member of myObj so the on value is true?

Without typescript I would just use reduce, but I get a overload error when I try to do so.

Here's the error:

Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Record'. No index signature with a parameter of type 'string' was found on type 'Record'.ts(7053)

Consider editing your code to constitute a minimal reproducible example as described by How to Ask. What's FeatureNames? What's FeatureDetails? What specific error do you see and in what code? — jcalz
– jcalz, Commented Jan 7, 2020 at 20:49

iY1NQ · Accepted Answer · 2020-01-07 21:06:59Z

3

You can explicit cast the key argument within the reduce function:

Object.keys(myObj).reduce((obj, key) => (obj[key as FeatureNames].on = true, obj), myObj)

edited Jan 7, 2020 at 21:06

answered Jan 7, 2020 at 21:04

iY1NQ

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1 Comment

a person Over a year ago

Thanks! That's exactly what I needed to do. It is super tedious to do though...

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