Enum

Zig enums are represented as unique objects in JavaScript.

const std = @import("std");

pub const Pet = enum { dog, cat, dragon };

pub fn print(pet: Pet) void {
    std.debug.print("pet = {s}\n", .{@tagName(pet)});
}

import { Pet, print } from './enum-example-1.zig';

console.log(typeof Pet.dog);
print(Pet.dog);
print(Pet.cat);

object
dog
cat

string and number are casted automatically to enums with the corresponding name or value.

import { print } from './enum-example-1.zig';

print('dog');
print(1);
try {
  print('dingo');
} catch (err) {
  console.log(err.message);
}

pet = dog
pet = cat
print(args[0]): Enum item of the type enum-example-1.Pet expected, received dingo

Conversely, enums can be converted to string and number using String() and Number().

import { Pet } from './enum-example-1.zig';

console.log(String(Pet.cat));
console.log(Number(Pet.cat));

cat
1

valueOf() and JSON.stringify() also convert enums to strings.

import { Pet } from './enum-example-1.zig';

console.log(Pet.cat.valueOf());
console.log(JSON.stringify(Pet.cat));

cat
"cat"