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I have this line of code that makes Typescript fire off an error:

const owner:boolean = jsonFile.owners.includes("10");

jsonFile is what I did from

import * as jsonFile from './dir/to/json/file.json'

Owners is an empty string[].

This is the error:

Argument of type 'string' is not assignable to parameter of type 'never'.

I know that I need to assign the type to this array, e.g. make it never[] -> string[], how would I do that? Preferably without strictNullChecks under tsconfig (solves this problem)

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    If you want to get the most out of a JSON object in typescript, I'd suggest making an interface for what you expect the JSON object to be (e.g. interface JSONFile { owners: string[] }) then casting the imported object to that type. Commented Aug 15, 2021 at 0:34
  • There's the option of using a type assertion, but for JSON there might be a better solution. Commented Aug 15, 2021 at 2:18
  • Hmm. I ended up having to force myself to use this snippet of code: const config:config = require('./config.json'); and I did use an interface (worked). This is what you mean by "casting the imported object to that type."? Commented Aug 15, 2021 at 2:22
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