Using Object.keys and reducing object keys

Question

I'm trying to reduce Object.keys, like this:

const example = { hello: true }
Object.keys(example).reduce((acq, key) => {
  const value = example[key]
  return acq
}, {})

For some reason I am getting a type error under example[key]

(parameter) key: string

Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{ hello: boolean; }'. No index signature with a parameter of type 'string' was found on type '{ hello: boolean; }'.(7053)

I created my own getKeys function with a generic that has the typings I'd expect:

function getKeys <T>(g: T) {
  return Object.keys(g) as (keyof T)[]
}

const example = { hello: true }
getKeys(example).reduce((acq, key) => {
  const value = example[key]
  return acq
}, {})

However I'm looking if this is possible without wrapping Object.keys.

Does this answer your question? TypeScript: Object.keys return string[] — ford04
– ford04, Commented May 9, 2020 at 8:59

Shane Richards · Accepted Answer · 2020-05-09 05:07:11Z

1

In this case you could provide a for your example variable as shown below to let typescript know that the keys are of type string.

const example = { hello: true } as { [key: string]: any }

answered May 9, 2020 at 5:07

Shane Richards

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