Research
Two Malicious Rust Crates Impersonate Popular Logger to Steal Wallet Keys
Socket uncovers malicious Rust crates impersonating fast_log to steal Solana and Ethereum wallet keys from source code.
By Kirill Boychenko - Sep 24, 2025
@engineersamuel/istruthy
Advanced tools
⚖️
Truthiness with options!
npm i @engineersamuel/istruthy
Zero dependency micro-library (1kb minified / 2.7kb unminified)
Table of Contents
Why
Most truthiness libraries are either extremely basic or simply adhere to the standard defnition of Truthy in JavaScript.
However, what happens when you want to consider '', [], {}, 0, or [null] false? This is where @engineersamuel/istruthy comes in.
Install
$ npm i -D @engineersamuel/istruthy
Usage
import { isTruthy, isFalsy } from '@engineersamuel/istruthy';
console.log(isTruthy('abc')); // prints true
console.log(isTruthy('', { isEmptyStringFalse: true })); // prints false
console.log(isFalse('abc')); // prints false
console.log(isFalsy('', { isEmptyStringFalse: true })); // prints true
See the *.spec.ts files in the ./test directory for a great reference on using isTruthy.
If you want to reference this library directly in html:
<!DOCTYPE html>
<html lang="en">
<head>
<title>My Page</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Other resources here -->
<!-- ... -->
<!-- Assembler CSS -->
<script src="https://cdn.jsdelivr.net/npm/@engineersamuel/istruthy@1.0.0/dist/index.min.js"></script>
</head>
<body>
<!-- Your code here -->
<script>
console.log(Truthiness.isTruthy('abc')); // prints true
console.log(Truthiness.isTruthy('', { isEmptyStringFalse: true })); // prints false
console.log(Truthiness.isFalse('abc')); // prints false
console.log(Truthiness.isFalsy('', { isEmptyStringFalse: true })); // prints true
</script>
</body>
</html>
Note that the UMD is built with rollup.js (Which is minimally necessary considering there are no dependencies) and the global variable name is Truthiness hence in the above browser environment you would access isTruthy via Truthiness.isTruthy.
Config
| Option | Default | Description |
|---|---|---|
| isZeroFalse | false | When set to true then 0 will be will be evaluated to false. Ex. isTruthy(0, { isZeroFalse: true}); // returns false |
| isInfinityFalse | false | When set to true then Infinity and -Infinity will be will be evaluated to false. Ex. isTruthy(Infinity, { isInfinityFalse: true}); // returns false |
| isEmptyStringFalse | false | When set to true then '' will be will be evaluated to false. Ex. isTruthy('', { isEmptyStringFalse: true}); // returns false |
| isEmptyObjectFalse | false | When set to true then {} will be will be evaluated to false. Ex. isTruthy({}, { isEmptyObjectFalse: true}); // returns false |
| isEmptyArrayFalse | false | When set to true then [] will be will be evaluated to false. Ex. isTruthy([], { isEmptyArrayFalse: true}); // returns false |
| isFilteredArrayFalse | false | When set to true then [null, undefined] will be will be evaluated to false. Ex. isTruthy([null, undefined], { isFilteredArrayFalse: true }); // returns false Note: This specific flag will recursively check each value, so passing options to isTruthy are recursively respected. |
| isFalsyArrayFalse | false | When set to true then [null, undefined] will be will be evaluated to false. Ex. isTruthy([null, undefined], { isFalsyArrayFalse: true})/ // returns false Ex. isTruthy([0, ''], { isFalsyArrayFalse: true, isZeroFalse: true, isEmptyStringFalse: true }); // returns false Note: This specific flag will recursively check each value, so passing options to isTruthy are recursively respected. |
Testing
npm run test
63 passing (38ms)
----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
----------|---------|----------|---------|---------|-------------------
All files | 100 | 100 | 100 | 100 |
index.ts | 100 | 100 | 100 | 100 |
----------|---------|----------|---------|---------|-------------------
Contributing
npm i- make code changes
npm run testnpm run lintnpm run build
Publishing
- Bump the package.json version
npm publish --access publicgit tag vx.y.zgit push origin --tags
License
Keywords
FAQs
Truthiness with options
We found that @engineersamuel/istruthy demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Package last updated on 12 Aug 2021
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Related posts
Research
Malicious fezbox npm Package Steals Browser Passwords from Cookies via Innovative QR Code Steganographic Technique
A malicious package uses a QR code as steganography in an innovative technique.
By Olivia Brown - Sep 22, 2025
Research
/Security News
Identifying and Preventing Fraudulent Engineering Candidates: An Investigation into 80 Confirmed Cases
Socket identified 80 fake candidates targeting engineering roles, including suspected North Korean operators, exposing the new reality of hiring as a security function.
By Lauren Valencia, Kirill Boychenko - Sep 17, 2025