Tips for utilizing programmatic object keys as TypeScript type?

Consider the object shown below:

const obj = {
  foo: "bar",
  hello: "world",
}

and this function for processing objects:

const process = (obj) => {
  const processedObj = {}
  for (const key in obj) {
    processedObj[`--${key}`] = obj[key]
  }
  return processedObj
}

Is there a way to restrict the key argument to only allow processed keys that begin with --?

const processedObj = process(obj)
const getValue = (key) => {
  return processedObj[key]
}

I am attempting to automate the conversion of JavaScript object properties into CSS variables so that Visual Studio Code's IntelliSense feature recommends getValue("--foo") when typing getValue("--f").

Answer №1

One way to accomplish this is by using the keyof typeof method:

const findValue = (property : keyof typeof object) => {
  return object[property]
}

Check out an example here

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