read() and file handling

import { read, MZMLFile, MSZFile } from "mscompress";

const f = read("anything.mzML");  // returns MZMLFile
const g = read("anything.msz");   // returns MSZFile

read() inspects the file's magic bytes — the MSZ tag 0x035F51B5 — and returns the right concrete class. Both extend BaseFile, so most code can work against the shared surface.

Direct construction

const mzml = new MZMLFile("data.mzML");
const msz  = new MSZFile("data.msz");

File-level metadata

f.path;           // string
f.filesize;       // number — bytes
f.format;         // DataFormat
f.spectra.length; // number

Resource cleanup

Always call close() when done:

const f = read("data.msz");
try {
  // ... use f ...
} finally {
  f.close();
}

Spectra hold references back into the file's mmap; reading them after close() throws.

The bindings work with the using declaration when your TypeScript target supports it:

using f = read("data.msz");
// ... f.close() is called automatically at scope exit ...