ast-deep-contains

Like t.same assert on array of objects, where element order doesn't matter.

Install

This package is pure ESM. If you're not ready yet, install an older version of this program, 3.1.0 (npm i ast-deep-contains@3.1.0).

npm i ast-deep-contains

Quick Take

import { strict as assert } from "assert";

import { deepContains } from "ast-deep-contains";

const gathered = [];
const errors = [];

const reference = [
  { c: "2" }, // will end up not used
  { a: "1", b: "2", c: "3" },
  { x: "8", y: "9", z: "0" },
];

const structureToMatch = [
  { a: "1", b: "2", c: "3" }, // matches but has different position in the source
  { x: "8", y: "9" }, // "z" missing
];

// This program pre-matches first, then matches objects as a set-subset
deepContains(
  reference,
  structureToMatch,
  (leftSideVal, rightSideVal) => {
    // This callback does the pre-matching and picks the key pairs for you.
    // It's up to you what you will do with left- and right-side
    // values - we normally feed them to unit test asserts but here we just push
    // to array:
    gathered.push([leftSideVal, rightSideVal]);
  },
  (err) => {
    errors.push(err);
  },
);

// imagine instead of pushing pairs into array, you fed them into assert
// function in unit tests:
assert.deepEqual(gathered, [
  ["1", "1"],
  ["2", "2"],
  ["3", "3"],
  ["8", "8"],
  ["9", "9"],
]);
assert.equal(errors.length, 0);

Documentation

Please visit codsen.com for a full description of the API.

Contributing

To report bugs or request features or assistance, raise an issue on GitHub.

Licence

MIT License

Copyright © 2010-2025 Roy Revelt and other contributors