RN前端简单实现

__DEV__ = false;

var __d = function (definition, moduleId, dependencies) {
    if (__DEV__) {
        if (moduleId in __r.modules) {
            // Handle redefinition of modules in development.
        }
    }
    __r.modules[moduleId] = [definition, dependencies];
};

var __r = {
    modules: {},
    cache: {},
    // Other runtime properties and methods...
};

// Module loader function
__r.require = function (moduleId) {
    if (__r.cache[moduleId]) {
        return __r.cache[moduleId].exports;
    }

    var module = (__r.cache[moduleId] = {
        exports: {},
    });

    var [definition, dependencies] = __r.modules[moduleId];

    function localRequire(name) {
        return __r.require(dependencies[name]);
    }

    definition.call(module.exports, localRequire, module, module.exports);

    return module.exports;
};

__d(
    function (require, module, exports) {
        module.exports = function () {
            console.log('Hello from foo');
        };
    },
    'foo',
    {}
);

__d(
    function (require, module, exports) {
        var foo = require('foo');
        module.exports = function () {
            foo();
            console.log('Hello from bar');
        };
    },
    'bar',
    { foo: 'foo' }
);

var bar = __r.require('bar');
bar(); // 输出: "Hello from foo" 和 "Hello from bar"