circular.spec.ts

import { describe, expect, test } from "vitest";

import { manage } from "../src/index.js";

describe("circular", () => {
  test("direct", () => {
    class A {
      public b = 1;
      public parent: A | null = null;
    }
    const a = new A();
    const ma = manage(a);
    ma.parent = ma;
  });
  test("indirect", () => {
    class A {
      public b = 1;
      public parent: A | null = null;
    }
    const a = new A();
    const b = new A();
    const ma = manage(a);
    const mb = manage(b);
    ma.parent = mb;
    mb.parent = ma;
  });
  test("3-steps away", () => {
    class A {
      public b = 1;
      public parent: A | null = null;
    }
    const a = new A();
    const b = new A();
    const c = new A();
    const ma = manage(a);
    const mb = manage(b);
    const mc = manage(c);
    ma.parent = mb;
    mb.parent = mc;
    mc.parent = ma;
  });
  test("manage after circular", () => {
    class A {
      constructor(public b?: B) {}
    }

    class B {
      constructor(public a: A) {}
    }

    const a = new A();
    const b = new B(a);
    a.b = b;

    const ma = manage(a); // will not trigger "RangeError: Maximum call stack size exceeded"
    expect(ma).toBeDefined();
    expect(ma.b).toBeDefined();
    expect(ma.b?.a).toBeDefined();
    expect(ma.b?.a.b).toBeDefined();
  });
});