ml‑rolling‑ball‑baseline is an npm package that implements the classic “rolling‑ball” algorithm for automatic baseline correction of spectral data (e.g., XRF, SEM, PIXE). It provides a simple `rollingBall(data, ballSize, windowSize)` function that returns the estimated baseline, making it useful for chemometric, analytical‑chemistry, or materials‑science developers who need to preprocess one‑dimensional spectra in JavaScript/Node.js applications.