Handling errors in libraries

nestedErrors.js

function mainApp() {
    
    libraryCode(input)
        .then((data) => console.log("main output", formatForUserView(data)))
        .catch((err) => {
            console.error("error from library!", err);
            display("user-friendly error message");
        });
}

function libraryCode(input) {
    let returnValue = {};
    
    return someLowLevelNodeOrNetworkFunction()
        .then((result) => processLowLevelDataHere(result))
        .catch((err) => {
            console.error("libraryCode had a problem calling someLowLevelNodeOrNetworkFunction with " + input, err);
            cleanupResources();
            throw new Error("libraryCode puked", err);
        });
}

I like it