NodeJS v12.13.0 中的私有静态方法 - 语法错误

Private static methods in NodeJS v12.13.0 - syntax error

如 Mozilla 在此处的 JavaScript 参考中所述:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Class_fields#Private_static_methods

私有静态方法应该这样工作:

class Foo {
  static #privateStaticMethod() {
    return 42;
  }
}

但是,在 NodeJS v12.13.0 中使用它时,会抛出以下语法错误:

static #privateStaticMethod() {
                             ^

SyntaxError: Unexpected token '('
    at Module._compile (internal/modules/cjs/loader.js:892:18)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
    at Module.load (internal/modules/cjs/loader.js:812:32)
    at Function.Module._load (internal/modules/cjs/loader.js:724:14)
    at Module.require (internal/modules/cjs/loader.js:849:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at Object.<anonymous> (.../foo.js:8:14)
    at Module._compile (internal/modules/cjs/loader.js:956:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
    at Module.load (internal/modules/cjs/loader.js:812:32)

查看 browser compatibility page,私有静态方法 应该 从 v12 开始支持。

这是为什么?

table 声明支持 Private Static 字段 ,而不是方法。

在节点 13.2.0 中,它在 --harmony-private-methods 标志下工作

[class] implement static private methods was added in v8 7.9. That version of v8 was added to Node 13.2.0


使用标志,在节点 12.13.0 中,您在尝试访问方法时不会得到 SyntaxError 而是 TypeError

TypeError: Read of private field Foo from an object which did not contain the field

v8 问题: Fully implemented behind flag