Troubleshooting TypeScript Code: Understanding Failures in Effect Handling

import { Effect } from "effect"

class NegativeAgeError {
    readonly _tag = "NegativeAgeError"
    constructor(readonly age: number) {}
}

class IllegalAgeError {
    readonly _tag = "IllegalAgeError"
    constructor(readonly age: number) {}
}

const validate = (
    age: number,
): Effect.Effect<number, NegativeAgeError | IllegalAgeError> => {
    if (age < 0) Effect.fail(new NegativeAgeError(age))
    if (age < 18) Effect.fail(new IllegalAgeError(age))
    return Effect.succeed(age)
}

const program2 = Effect.orElseFail(validate(3), () => "invalid age")
const program3 = Effect.orElseSucceed(validate(3), () => 0)

console.log(Effect.runSync(validate(19)))
console.log(Effect.runSync(program2))
console.log(Effect.runSync(program3))