The **dirichlet** package provides a tiny JavaScript implementation of the Dirichlet (aliased sinc) function, which computes \[ \text{dirichlet}(n,x)=\begin{cases} 1 &\text{if }x\bmod n = 0\\[4pt] \frac{\sin(\pi x)}{n\,\sin(\pi x/n)} &\text{otherwise} \end{cases} \] and can be used as the inverse Fourier transform of a discrete rectangle. It’s aimed at developers working with signal‑processing, Fourier analysis, or any JavaScript/Node.js code that needs an efficient evaluation of this mathematical function. Installation is via `npm install dirichlet` and the API is a single function `require('dirichlet')(n, x)`.