lilacs/util/try_node_modules.js

A web frontend building tool for teamwork, with automaticly compiling, merging, minifying, syncing files to server, supporting distributed servers, ensuring css or html files' inline reference with correct absolute path, and more.

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

const pathUtil = require('./path');
const getFilePathFromPackage = require('./get_file_path_from_package');
const fileUtil = require('../util/file');

let response = (res, realFilePath, isJs) => {
    let fileStat = fs.statSync(realFilePath);
    res.writeHead(200, {
        'Content-Type': isJs ? 'application/javascript' : 'text/css',
        'Content-Length': fileStat.size
    });

    let readStream = fs.createReadStream(realFilePath);
    readStream.pipe(res);
};

module.exports = (req, res, next) => {
    let filePath = req.url.split('?')[0];
    // only do to js/css file
    if (filePath.slice(-3) !== '.js' && filePath.slice(-4) !== '.css') {
        next();
        return;
    }

    const projectConfig = require('../project_config');

    // file exist in projectConfig.basePaths.webRoot
    if (fileUtil.fileExist(path.join(projectConfig.basePaths.webRoot, filePath))) {
        next();
        return;
    }

    let isJs = !1;
    let pureFilePath = '';

    // js
    if (filePath.slice(-3) === '.js') {
        isJs = !0;
        pureFilePath = filePath.slice(0, -3);
    }
    // css
    else {
        isJs = !1;
        pureFilePath = filePath.slice(0, -4);
    }

    // not exist
    if (!pureFilePath) {
        next();
        return;
    }

    // do not exist requireJsConfig
    if (isJs && !projectConfig.requireJsConfig || !isJs && !projectConfig.inCssConfig) {
        next();
        return;
    }

    // not exist, try node_modules
    let module = pathUtil.replaceBackSlash(path.relative(
        isJs ? projectConfig.requireJsConfig.baseUrl : projectConfig.inCssConfig.baseUrl, pureFilePath
    ));

    let realFilePath = getFilePathFromPackage(module, isJs);

    if (realFilePath) response(res, realFilePath, isJs);
    else next();
};