scriptc/tests/corpus/7537-inspect-custom-errors.cjs

// An Effect-style error class in JavaScript: a method keyed by
// Symbol.for("nodejs.util.inspect.custom") on an Error subclass, called by
// console.log and util.inspect for direct, caught and contained values,
// and the class still constructs and throws when nothing inspects it.
"use strict";
const util = require("util");
const NodeInspectSymbol = Symbol.for("nodejs.util.inspect.custom");

class YieldableError extends Error {
  toJSON() {
    return { _tag: "YieldableError", message: this.message };
  }
  [NodeInspectSymbol]() {
    return `YieldableError: ${this.message}`;
  }
}

const direct = new YieldableError("direct");
console.log(direct, direct instanceof Error, JSON.stringify(direct));
try {
  throw new YieldableError("boom");
} catch (e) {
  console.log(e instanceof YieldableError, e.message);
  console.log(e);
  console.log(util.inspect([e]), util.inspect({ e }));
}