What is the recommended approach for replacing TypeScript `enum` with a different solution?

In my recent studies, I came across a recommendation to avoid using the built-in enum feature in TypeScript. Instead, the suggestion was to define custom enums as follows:

const MyEnum = {
  name: 'name',
  email: 'email'
} as const;
type MyEnum = keyof typeof MyEnum;

The advantages of this approach are clear:

  1. Having MyEnum.name available for use wherever a MyEnum argument is expected.
  2. Using string literals like 'name' without needing to import MyEnum.
  3. Preventing both key and value types from being included in the output of Object.keys(MyEnum) when MyEnum contains numbers instead of strings.

While I appreciate these benefits, the current implementation still requires defining a string literal for each key. I'm curious if there's a way to avoid this. For instance, could we create an enum using an array like ['name', 'email']?

Answer №1

An effective method is to utilize unions of string literals for defining an enum:

type MyEnum = "option1" | "option2";

Is there any functionality of enums that you feel is lacking with this approach?

Edit:

If the ability to iterate through enum values is necessary, you can create it from an array:

const myValues = ["option1", "option2"];
type MyEnum = typeof myValues[number];

The necessity to access values using MyEnum.value syntax over just referencing the string literal like "value" remains unclear, as the latter is concise, does not demand imports, and presents no known disadvantages.

If desired, achieving the former could potentially be done with a snippet similar to this (not verified, possible need for name adjustment):

const MyEnum = Object.fromEntries(myValues.map(v => [v, v])) as {
  [K in MyEnum]: K;
};

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