生成的function.length不正确

[axetroy]

例如运行这段代码:

function test(name){
  return "hello " + name;
}

console.log(test.length); // 正常情况下，应该是1， 但实际上是0

module.exports = test;

查看了相关源码，在下面的:

jsjs/src/eval.ts

Line 247 in b0f6711

FunctionExpression: (node: ESTree.FunctionExpression, scope: Scope) => {

    FunctionExpression: (node: ESTree.FunctionExpression, scope: Scope) => { 
        return function (...args) {
            const new_scope = new Scope('function', scope)
            new_scope.invasived = true
            for (let i = 0; i < node.params.length; i++) {
                const { name } = <ESTree.Identifier>node.params[i]
                new_scope.$const(name, args[i])
            }
            new_scope.$const('this', this)
            new_scope.$const('arguments', arguments)
            const result = evaluate(node.body, new_scope)
            if (result === RETURN_SINGAL) {
                return result.result
            }
        }
    },

这里Return的function，使用的是 function (...args)，导致它的length属性不确定..

可以这么改

    FunctionExpression: (node: ESTree.FunctionExpression, scope: Scope) => { 
        const func function (...args) {
            const new_scope = new Scope('function', scope)
            new_scope.invasived = true
            for (let i = 0; i < node.params.length; i++) {
                const { name } = <ESTree.Identifier>node.params[i]
                new_scope.$const(name, args[i])
            }
            new_scope.$const('this', this)
            new_scope.$const('arguments', arguments)
            const result = evaluate(node.body, new_scope)
            if (result === RETURN_SINGAL) {
                return result.result
            }
        }

        // 手动矫正length
        Object.defineProperty(func, "length", {value: node.params.length});

        return func;
    },

[axetroy]

顺便问一下，许可协议是什么。

打算做一个Babel的版本，在这个基础上改进。现实VM

[bramblex]

确实还有很多问题需要矫正，谢啦。
木有许可协议，那就 DWTFYW 好了。