Given an object and a property, replaces a property descriptor (or deletes it), and returns a thunk to restore it.

Last update: Apr 20, 2022

Overview

mock-property

Given an object and a property, replaces a property descriptor (or deletes it), and returns a thunk to restore it.

Example

var mockProperty = require('mock-property');
var assert = require('assert');

var i = 0;
var object = {
    a: 1,
    get b() {
        i += 1;
        return 'b ' + i;
    }
};

assert.equal(object.a, 1);
assert.equal(object.b, 'b 1');
assert.equal(object.b, 'b 2');

var restoreA = mockProperty(object, 'a', { 'delete': true });
assert.equal('a' in object, false);

var restoreB = mockProperty(object, 'b', { value: 42 });
assert.equal(object.b, 42);

restoreA();
assert.equal('a' in object, true);

restoreB();
assert.equal(object.b, 'b 3');

Tests

Simply clone the repo, npm install, and run npm test

Security

Please email @ljharb or see https://tidelift.com/security if you have a potential security vulnerability to report.

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Comments

Simple save/restore pattern
For simple use by people unfamiliar with descriptors, but wanting to safely put back the old state after overwriting a property, a simple save and restore might be useful. Two cases where I have wanted to do this are setting an environment variable for a unit test, and hacking process.argv to run a unit test.

I suspect this is equivalent to is a delete in the first operation to clear the way for whatever I do, and perhaps doesn't make sense as a "mock" pattern. Could be wishful thinking that this might be a possible helper routine. 😄

Edit: a better description of the usage pattern might be "stash" and "restore".

e.g.

var restoreArgv = mockProperty(process, 'argv'); process.argv = ['someApp', 'someFile', 'arg1']; // run test restoreArgv();
question
opened by shadowspawn 1
Dependency Dashboard
This issue lists Renovate updates and detected dependencies. Read the Dependency Dashboard docs to learn more.

Pending Approval

These branches will be created by Renovate only once you click their checkbox below.

[ ] [Deps] Update Update eslint to v8.31.0

[ ] [Deps] Update Update nyc to v15

[ ] 🔐 Create all pending approval PRs at once 🔐

Detected dependencies

github-actions

.github/workflows/node-aught.yml

.github/workflows/node-pretest.yml

.github/workflows/node-tens.yml

.github/workflows/rebase.yml

actions/checkout v3

.github/workflows/require-allow-edits.yml

npm

package.json

functions-have-names ^1.2.3

has ^1.0.3

has-property-descriptors ^1.0.0

isarray ^2.0.5

@ljharb/eslint-config ^21.0.0

aud ^2.0.0

auto-changelog ^2.4.0

es-value-fixtures ^1.4.2

eslint =8.8.0

evalmd ^0.0.19

for-each ^0.3.3

in-publish ^2.0.1

npmignore ^0.3.0

nyc ^10.3.2

object-inspect ^1.12.2

safe-publish-latest ^2.0.0

tape ^5.6.1

[ ] Check this box to trigger a request for Renovate to run again on this repository
opened by renovate[bot] 0

Given an object and a property, replaces a property descriptor (or deletes it), and returns a thunk to restore it.

Related tags

Overview

mock-property

Example

Tests

Security

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