Objectionable

When something is mutating your data, and you don't know what it is, find it objectionable.

This will setup a deep proxy that will alert you whenever an object is mutated.

let objected = objectionable([{ a: [0, { b: [{ c: 1 }] }] }]);
objected[0].a[1].b[0].c = 2;
// Console.log >> "Set: /0/a/1/b/0/c to 2";

Check tests to see all covered cases. Some highlights-

• new key added
• editing existing value
• deep nesting, including mixed arrays and objects
• new value added to array
• length changed on array (implicitly and explicitly)

Get started

1. Install:

npm install objectionable
pnpm add objectionable
yarn add objectionable

2. Import into your project:

import objectionable from "objectionable";

3. Wrap any assignments to the value you want to track with objectionable.

let observed = objectionable(newValue);

Any mutations to observed will be reported.

4. Fix the issue, and uninstall objectionable. This strategy may have unintended consequences, so it's not recommended to use it long term.

Features:

1. No dependencies
2. Designed for temporary troubleshooting
3. 100% test coverage
4. Handles deeply nested array and objects
5. Helpful for troubleshooting React, Vue and Svelte reactivity issues.

Options:

setValue - Boolean, defaults to true

If true, object setting acts as normal. If false, the value won't change, and an error will be thrown on every set.

reporter - callback, defaults to console.log of Set: ${path} to ${value}

Callback receives the following arguments-

• object- the entire observed object
• prop- the specific key being set
• path- a / separated path to the key
• value- the value being set

Example callback, which would throw an error when a specific key is changed-

const callback: ObjectionableReporterCallback = function (
  object,
  property,
  path,
  value
) {
  if (path === "deep/path/set") {
    throw new Error(`${path} set to ${value}`);
  }
};

Other options

• Roll your own recursive proxy.
  • Certainly less overhead, but there are fair number of edge cases you may miss. For example, most StackOverflow solutions don't handle arrays.
• https://github.com/samvv/js-proxy-deep or https://github.com/qiwi/deep-proxy
  • Allows for more use cases of proxies, but requires more setup to solve this particular use.

Contributing

See CONTRIBUTING.md for more details.