file-syntax.js

const fs = require('fs');
const fsp = require('path');

function scan(dir, results, mod) {
    fs.readdirSync(dir).forEach(name => {
        const path = fsp.join(dir, name);
        let m;
        if (fs.statSync(path).isDirectory()) {
            scan(path, results, name === 'node_modules' ? null : mod === null ? name : mod);
        } else if (mod && (m = /(.*)\.[jt]s$/.exec(name)) && !/\.(d|min|debug)$/.test(m[1])) {
            const counters = results[mod] || (results[mod] = {});
            if (/^_?[a-z0-9]+$/.test(m[1])) {
                counters.neutral = (counters.neutral || 0) + 1;
            } else if (/^[A-Z0-9_]+$/.test(m[1])) {
                counters.upper =  (counters.upper || 0) + 1;
            } else if (/^_?[a-z][A-Za-z0-9]+$/.test(m[1])) {
                counters.camel =  (counters.camel || 0) + 1;
            } else if (/^_?[A-Z][A-Za-z0-9]+$/.test(m[1])) {
                counters.pascal =  (counters.pascal || 0) + 1;
            } else if (/^[a-z0-9-]+$/.test(m[1])) {
                counters.kebab =  (counters.kebab || 0) + 1;
            } else if (/^[a-z0-9_]+$/.test(m[1])) {
                counters.snake =  (counters.snake || 0) + 1;
            } else {
                counters.other =  (counters.other || 0) + 1;
            }
        }
    });
    return results;
}

const root = process.argv[2];

function main() {
    if (!root) throw new Error('no root');
    const results = scan(root, {});
    const totals = {
        upper: [],
        camel: [],
        pascal: [],
        kebab: [],
        snake: [],
        other: [],
        neutral: [],
        multiple: [],
    }
    Object.keys(results).sort().forEach(k => {
        const r = results[k];
        const flags = !!r.upper + !!r.camel + !!r.pascal + !!r.kebab + !!r.snake + !!r.other;
        //console.log(flags);
        if (flags === 0) {
            totals.neutral.push(k);
        } else if (flags === 1) {
            if (r.upper) totals.upper.push(k);
            else if (r.camel) totals.camel.push(k);
            else if (r.pascal) totals.pascal.push(k);
            else if (r.kebab) totals.kebab.push(k);
            else if (r.snake) totals.snake.push(k);
            else if (r.other) totals.other.push(k);
            else throw new Error();
        } else {
            totals.multiple.push(k);
        }
    });
    console.log(totals);
    console.log(Object.keys(totals).map(k => k + ': ' + totals[k].length));
}

main();

Small utility to get basic stats of filename syntax. Usage:

$ node file-syntax rootdir