Get some stats on each Elm module's contribution to your compiled code size.

count.js

fs = require("fs");
let buff = fs.readFileSync(0);
let source = buff.toString();
let lines = source.split('\n');

let count = {};
let lastName = null;

for (let line of lines) {
    let name = line.match(/^var ([\w\$]+)\$/);

    if (name) {
        lastName = name[1].replace(/^\$(\w+)\$(\w+)\$/, '$1/$2:').replace(/\$/g, '.');
    }
    if (lastName) {
        count[lastName] = count[lastName] ? count[lastName] + 1 : 1;
    }
}

let modules = Object.keys(count)
    .map(key => {
        let parts = key.split(':');
        let package = parts[0];
        let module = parts[1];

        return {
            name: module,
            package: package,
            count: count[key]
        }
});


function byCount(a, b) {
    return b.count - a.count;
}

var byPackage = {};

for (let module of modules) {
    if (byPackage[module.package]) {
        byPackage[module.package].push(module);
    } else {
        byPackage[module.package] = [ module ];
    }
}


const sumCount = modules => modules.reduce((sum, mod) => sum + mod.count, 0);

var packages =
    Object
        .entries(byPackage)
        .map(([ key, value ]) => {
            return {
                name: key,
                modules: value.sort(byCount),
                count: sumCount(value),
            }
        })
        .sort(byCount);

for (package of packages) {
    process.stdout.write(`${package.count} ${package.name}\n`);
    for (module of package.modules) {
        process.stdout.write(`    ${String(module.count).padStart(4)} ${module.name}\n`);
    }
}


console.log(modules.reduce((acc, mod) => acc + mod.count, 0))