(() => {
  // A real stack names this file and a line in it, so each error that has
  // one gets a representative one instead.
  const withStack = (error) => {
    error.stack = `${error.name}: ${error.message}\n` +
      "    at frob (file:///example/frob.ts:12:34)";
    return error;
  };
  const bare = (message) =>
    new FabricError({ type: "Error", message, stack: undefined, cause: undefined });
  return {
    plain: FabricError.fromNativeError(withStack(new Error("boom"))),
    bare: bare("boom"),
    "type other than `Error`": FabricError.fromNativeError(
      withStack(new TypeError("not a thing")),
    ),
    "name differs from type": new FabricError({
      type: "TypeError",
      name: "FrobError",
      message: "frob failed",
      stack: undefined,
      cause: undefined,
    }),
    "with native cause": FabricError.fromNativeError(
      withStack(new Error("outer", { cause: withStack(new Error("inner")) })),
    ),
    "with fabric cause": new FabricError({
      type: "Error",
      message: "outer",
      stack: undefined,
      cause: { detail: 1, where: ["x", 2] },
    }),
    "with extras": FabricError.fromNativeError(
      Object.assign(withStack(new Error("extra")), {
        code: 42,
        when: new Date("2026-09-03T12:34:56.789Z"),
      }),
    ),
    "cause chain": FabricError.fromNativeError(
      withStack(new Error("top", {
        cause: withStack(new Error("middle", {
          cause: withStack(new Error("root")),
        })),
      })),
    ),
  };
})()

--

plain:
/Error(type:"Error",name:null,message:"boom",stack:"Error: boom\n    at frob (file:///example/frob.ts:12:34)")
/Error(
  type: "Error",
  name: null,
  message: "boom",
  stack: "Error: boom\n" +
    "    at frob (file:///example/frob.ts:12:34)"
)
{
  "/Error@1": {
    type: "Error",
    name: null,
    message: "boom",
    stack: "Error: boom\n" +
      "    at frob (file:///example/frob.ts:12:34)"
  }
}

bare:
/Error(type:"Error",name:null,message:"boom")
/Error(
  type: "Error",
  name: null,
  message: "boom"
)
{
  "/Error@1": {
    type: "Error",
    name: null,
    message: "boom"
  }
}

type other than `Error`:
/Error(type:"TypeError",name:null,message:"not a thing",stack:"TypeError: not a thing\n    at frob (file:///example/frob.ts:12:34)")
/Error(
  type: "TypeError",
  name: null,
  message: "not a thing",
  stack: "TypeError: not a thing\n" +
    "    at frob (file:///example/frob.ts:12:34)"
)
{
  "/Error@1": {
    type: "TypeError",
    name: null,
    message: "not a thing",
    stack: "TypeError: not a thing\n" +
      "    at frob (file:///example/frob.ts:12:34)"
  }
}

name differs from type:
/Error(type:"TypeError",name:"FrobError",message:"frob failed")
/Error(
  type: "TypeError",
  name: "FrobError",
  message: "frob failed"
)
{
  "/Error@1": {
    type: "TypeError",
    name: "FrobError",
    message: "frob failed"
  }
}

with native cause:
/Error(type:"Error",name:null,message:"outer",stack:"Error: outer\n    at frob (file:///example/frob.ts:12:34)",cause:/Error(type:"Error",name:null,message:"inner",stack:"Error: inner\n    at frob (file:///example/frob.ts:12:34)"))
/Error(
  type: "Error",
  name: null,
  message: "outer",
  stack: "Error: outer\n" +
    "    at frob (file:///example/frob.ts:12:34)",
  cause: /Error(
    type: "Error",
    name: null,
    message: "inner",
    stack: "Error: inner\n" +
      "    at frob (file:///example/frob.ts:12:34)"
  )
)
{
  "/Error@1": {
    type: "Error",
    name: null,
    message: "outer",
    stack: "Error: outer\n" +
      "    at frob (file:///example/frob.ts:12:34)",
    cause: {
      "/Error@1": {
        type: "Error",
        name: null,
        message: "inner",
        stack: "Error: inner\n" +
          "    at frob (file:///example/frob.ts:12:34)"
      }
    }
  }
}

with fabric cause:
/Error(type:"Error",name:null,message:"outer",cause:{detail:1,where:["x",2]})
/Error(
  type: "Error",
  name: null,
  message: "outer",
  cause: {
    detail: 1,
    where: [
      "x",
      2
    ]
  }
)
{
  "/Error@1": {
    type: "Error",
    name: null,
    message: "outer",
    cause: {
      detail: 1,
      where: [
        "x",
        2
      ]
    }
  }
}

with extras:
/Error(type:"Error",name:null,message:"extra",stack:"Error: extra\n    at frob (file:///example/frob.ts:12:34)",code:42,when:/EpochNsec(1788438896789000000n))
/Error(
  type: "Error",
  name: null,
  message: "extra",
  stack: "Error: extra\n" +
    "    at frob (file:///example/frob.ts:12:34)",
  code: 42,
  when: /EpochNsec(1788438896789000000n)
)
{
  "/Error@1": {
    type: "Error",
    name: null,
    message: "extra",
    stack: "Error: extra\n" +
      "    at frob (file:///example/frob.ts:12:34)",
    code: 42,
    when: /EpochNsec(1788438896789000000n)
  }
}

cause chain:
/Error(type:"Error",name:null,message:"top",stack:"Error: top\n    at frob (file:///example/frob.ts:12:34)",cause:/Error(type:"Error",name:null,message:"middle",stack:"Error: middle\n    at frob (file:///example/frob.ts:12:34)",cause:/Error(type:"Error",name:null,message:"root",stack:"Error: root\n    at frob (file:///example/frob.ts:12:34)")))
/Error(
  type: "Error",
  name: null,
  message: "top",
  stack: "Error: top\n" +
    "    at frob (file:///example/frob.ts:12:34)",
  cause: /Error(
    type: "Error",
    name: null,
    message: "middle",
    stack: "Error: middle\n" +
      "    at frob (file:///example/frob.ts:12:34)",
    cause: /Error(
      type: "Error",
      name: null,
      message: "root",
      stack: "Error: root\n" +
        "    at frob (file:///example/frob.ts:12:34)"
    )
  )
)
{
  "/Error@1": {
    type: "Error",
    name: null,
    message: "top",
    stack: "Error: top\n" +
      "    at frob (file:///example/frob.ts:12:34)",
    cause: {
      "/Error@1": {
        type: "Error",
        name: null,
        message: "middle",
        stack: "Error: middle\n" +
          "    at frob (file:///example/frob.ts:12:34)",
        cause: {
          "/Error@1": {
            type: "Error",
            name: null,
            message: "root",
            stack: "Error: root\n" +
              "    at frob (file:///example/frob.ts:12:34)"
          }
        }
      }
    }
  }
}