I needed this functionality to parse a configuration regardless of whether it was supplied as an array or a Record. This function converts the Record into an array of the same type:

1function mapRecordToArray<T, R extends Omit<T, K>, K extends keyof T>(record: Record<string, R>, recordKeyName: K) {
2  return Object.keys(record).map(key => ({ ...record[key as keyof typeof record], [recordKeyName]: key })) as T[]
3}
4

It can be used like this:

1type Field = {
2  name: string,
3  label: string,
4}
5
6type Collection = {
7  name: string,
8  label: string,
9  fields: Record<string, Omit<Field, 'name'>> | Field[]
10}
11
12const collections:Collections[] = [] // ...
13
14collections.forEach(collection => {
15  const fields = Array.isArray(collection.fields)
16    ? collection.fields
17    : mapRecordToArray(collection.fields, 'name')
18})
19// Function typings will look like this:
20// function mapRecordToArray<Field, Omit<Field, "name">, "name">(record: Record<string, Omit<Field, "name">>, recordKeyName: "name"): Field[]
21
22// Notice the return type: Field[]
23