lilacs/util/get_file_path_from_package.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 vars = require('../data/vars');
const fileUtil = require('../util/file');

module.exports = (module, isJs) => {
    let fileSuffix = isJs ? '.js' : '.css';
    let nodeModulesDir = vars.projectRoot + '/node_modules/';

    // bootstrap/dist/js/bootstrap.js, bootstrap/dist/css/bootstrap.css
    let directTryFilePath = nodeModulesDir + module + fileSuffix;
    if (fileUtil.fileExist(directTryFilePath)) {
        return directTryFilePath;
    }

    // jquery, @company/package
    let libraryDir = nodeModulesDir + module;
    let packageFilePath = nodeModulesDir + module + '/package.json';
    // not exist
    if (!fileUtil.fileExist(packageFilePath)) {
        return null;
    }

    let packageJson = require(packageFilePath);
    let mainFile = packageJson['amd:main'] || packageJson['umd:main'] || packageJson.main;

    // jquery, no main field
    if (!mainFile) {
        return null;
    }

    // main: 'dist/demo', main: 'dist/demo.js', main: 'dist/demo.css', main: './dist/demo.js'
    let libraryMainFile = '';
    if (isJs) {
        libraryMainFile = mainFile.slice(-3) === '.js' ? mainFile : mainFile + '.js';
    }
    else {
        libraryMainFile = mainFile.slice(-4) === '.css' ? mainFile : mainFile + '.css';
    }

    let realFilePath = path.join(libraryDir, libraryMainFile);

    // not exist
    if (!fileUtil.fileExist(realFilePath)) {
        return null;
    }

    return realFilePath;
};