import { describe, expect, it } from "@suaveplan/testing/runner";

describe("universal purity", () => {
    it("dist references no browser or Node globals", { timeout: 5000 }, () => {
        // This test is a structural guard; the actual check happens at build time.
        // We verify the package.json sideEffects flag and absence of platform deps.
        const pkg = require("../package.json");
        expect(pkg.sideEffects).toBe(false);
        const deps = Object.keys(pkg.dependencies ?? {});
        for (const dep of deps) {
            expect(dep).not.toMatch(/^node:/);
        }
    });

    it("dependency set is limited to the declared workspace deps and zod", {
        timeout: 5000,
    }, () => {
        const pkg = require("../package.json");
        const deps = Object.keys(pkg.dependencies ?? {});
        const allowed = [
            "@opentelemetry/api",
            "@suaveplan/error",
            "@suaveplan/events",
            "@suaveplan/fsm",
            "@suaveplan/timing",
            "@suaveplan/types",
            "tslib",
            "zod",
        ];
        for (const dep of deps) {
            expect(allowed).toContain(dep);
        }
    });

    it("importing the package mutates no global state", {
        timeout: 5000,
    }, () => {
        // Re-importing should not throw or mutate globals.
        expect(() => import("../src/index")).not.toThrow();
    });
});