Property 'entries' does not exist on type ObjectConstructor

Question

I'm using the object.entries method to push some JSON object data into an array... it was working and now I'm getting the error:

Property 'entries' does not exist on type 'ObjectConstructor'.

I understand from looking at similar issues, this may be because the version of typescript I am using does not support the entries method, but is there an alternative? I don't feel comfortable changing versions etc as I'm new to typescript.

Object.entries(data).forEach(([key, value]) => {
                this.array.push ({
                        id: key,
                        name: value.name,
                        desc: value.desc})
            });

thank you for any input/help :)

Answer 1

maybe you're using a browser that doesn't support that new-ish function, Object.entries

you should install the following "polyfill" from mdn:

if (!Object.entries)
  Object.entries = function( obj ){
    var ownProps = Object.keys( obj ),
        i = ownProps.length,
        resArray = new Array(i); // preallocate the Array
    while (i--)
      resArray[i] = [ownProps[i], obj[ownProps[i]]];

    return resArray;
  };

after that code is run, Object.entries should be made available to your javascript runtime, it should fix the error

---

also, you could write your code this way to give a different sort of feel

// gather the items
const items = Object.entries(data).map(([key, value]) => ({
  id: key,
  name: value.name,
  desc: value.desc
}))

// append items to array
this.array = [...this.array, ...items]

Answer 2

Try adding "esnext" to the libs in your tsconfig.json file, like this:

  "lib": ["es2018", "dom", "esnext"] 

See Typescript issue 30933.