Chai-equal-ignore-undefined-properties NPM

chai-equal-ignore-undefined-properties

Ignore keys with undefined value to compare from a deep equal operation with chai expect.

Why?

Sometimes you will have properties which have undefined value. This plugin helps to ignore those properties from comparison.

Works with both objects and array of objects with or without circular references.

Installation

npm install chai-equal-ignore-undefined-properties --save-dev

yarn add chai-equal-ignore-undefined-properties --dev

Usage

Require

const chai = require("chai");
const chaiIgnoreUndefinedProperties = require("chai-equal-ignore-undefined-properties");

chai.use(chaiIgnoreUndefinedProperties);

ES6 Import

import chai from "chai";
import chaiIgnoreUndefinedProperties from "chai-equal-ignore-undefined-properties";

chai.use(chaiIgnoreUndefinedProperties);

TypeScript

import * as chai from "chai";
import chaiIgnoreUndefinedProperties from "chai-equal-ignore-undefined-properties";

chai.use(chaiIgnoreUndefinedProperties);

// The typings for chai-equal-ignore-undefined-properties are included with the package itself.

Examples

All these examples are for JavaScript.

a) excluding

Ignore a top level property from an object

expect({ aa: undefined, bb: "b" }).to.equal({
  bb: "b",
  cc: undefined,
});

Ignore properties within array with undefined values

const expectedArray = [{ aa: undefined, bb: "b" }];
const actualArray = [{ cc: undefined, bb: "b" }];
expect(actualArray).to.deep.equal(expectedArray);

Ignore a nested properties with undefined value (only for deep equal comparison)

expect({
  topLevelProp: { aa: undefined, bb: "b" },
}).to.deep.equal({
  topLevelProp: { bb: "b", cc: undefined },
});

Works with circular dependencies

const actualObject = { aa: undefined, bb: "b" };
actualObject.c = actualObject;

const expectedObject = { bb: "b", cc: undefined };
expectedObject.c = expectedObject;

expect(actualObject).to.deep.equal(expectedObject);