local-define-plugin, predefine for webpack

local-define-plugin.js

var RawSource = require('webpack-core/lib/RawSource')
function TestPlugin (options) {
    
}
var jsrg = /\.js($|\?)/i;

TestPlugin.prototype.apply = function (compiler) {
    debugger;
    compiler.plugin('compilation', function (compilation) {
        debugger;
        compilation.plugin('optimize-chunk-assets', function (chunks) {
            chunks.forEach(function (chunk) {
                var files = [];
                chunk.files.forEach(function (file) {
                    files.push(file)
                })
                files = files.filter(file => jsrg.test(file));
                console.log(files);
                    files.forEach(file => {
                        try {
                            const asset = compilation.assets[file];
                            const source = asset.source();
                            const result = compileDefine(source);
                            compilation.assets[file] = new RawSource(result);
                        } catch (e) {
                            compilation.errors.push(e);
                        }
                    })
            })
            var raws = new RawSource(compilation.assets['bundle.js'])
            debugger;
        })
    })
    compiler.plugin('emit', function (compilation, callback) {
        debugger;
        callback();
    })
}

function compileDefine(src) {
    // console.log('compile ', src);
    var defs = src.match(/define\s*=\s*({.*})/);
    // console.log('defs', defs);
    if (!defs) {
        return src;
    }
    var defobj = {};
    eval('defobj=' + defs[1]);
    var keys = Object.keys(defobj);
    console.log('defobj', defobj, 'keys', keys);
    keys.forEach(varkey => {
        var re = new RegExp('\\b'+varkey+'\\b', 'g')
            console.log(re);
        src = src.replace(re, defobj[varkey]);
    })
    console.log(src);
    return src;
}

module.exports = TestPlugin;