Javascript ES6：如何在库的多个文件中重用const变量，但不向客户机代码公开它？

我正在编写一个由几个文件组成的库：

./lib:
 - core.js
 - file1.js
 - file2.js
 - file3.js

lib/core.js

包含我需要在

file1.js

、

file2.js

和

file3.js

中重用的公共变量

例如，

core.js

：

/**
 * I would like to reuse this constant in file1.js, file2.js and file3.js,
 * but I don't want client code to be able to access the value of this constant
 * when importing components of my library, like "aFunction" below.
 */
export const CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY = 'Some value';

/**
 * I would like to expose this function to client code
 * as well as to the other files of the library (file1.js, file2.js and file3.js).
 */
export const aFunction = () => {
}

...

const CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY = 'Some value';

export const getThatVariable = () => CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY;

export const aFunction = () => {
}

import { getThatVariable } from "./core.js"


export const file1Function = () => {
    const neededVariable = getThatVariable();
    console.log(neededVariable);
}

然后

file1.js

（

file2.js

和

file3.js

类似）：

如何使用ES6模块实现这一点？现在，通过此设置，

CONSTANT\u I\u希望\u重用\u库的其他\u文件中的\u也可用于客户端代码

但我想将其保留为“模块专用”，即仅对我的库代码可用

感谢您的关注。
如果您不希望任何变量在模块（文件）外部可见，则只需声明它并在模块内部分配一个值，但不要导出该变量。在
core.js
中：


/**
 * I would like to reuse this constant in file1.js, file2.js and file3.js,
 * but I don't want client code to be able to access the value of this constant
 * when importing components of my library, like "aFunction" below.
 */
export const CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY = 'Some value';

/**
 * I would like to expose this function to client code
 * as well as to the other files of the library (file1.js, file2.js and file3.js).
 */
export const aFunction = () => {
}

...


const CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY = 'Some value';

export const getThatVariable = () => CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY;

export const aFunction = () => {
}

import { getThatVariable } from "./core.js"


export const file1Function = () => {
    const neededVariable = getThatVariable();
    console.log(neededVariable);
}

在
文件1.js中
：


/**
 * I would like to reuse this constant in file1.js, file2.js and file3.js,
 * but I don't want client code to be able to access the value of this constant
 * when importing components of my library, like "aFunction" below.
 */
export const CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY = 'Some value';

/**
 * I would like to expose this function to client code
 * as well as to the other files of the library (file1.js, file2.js and file3.js).
 */
export const aFunction = () => {
}

...


const CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY = 'Some value';

export const getThatVariable = () => CONSTANT_I_WANT_TO_REUSE_IN_OTHER_FILES_OF_THE_LIBRARY;

export const aFunction = () => {
}

import { getThatVariable } from "./core.js"


export const file1Function = () => {
    const neededVariable = getThatVariable();
    console.log(neededVariable);
}

不要导出该常量。只需声明它，分配一个值并在某些函数中使用。然后导出该函数。您还可以添加
getter
。谢谢您的评论。你能举个例子吗？没有别的办法了，对吧？客户端代码仍然可以访问
getThatVariable
。他不访问您的变量，他只可以获取它的值。但他无法改变这一点。除非你用
setter
给他这个机会。但这是另一个故事）我只是向您展示了最简单的方法，但您也可以通过其他方式“屏蔽”获取该变量。
但他无法改变这一点即使不使用getter，客户端代码也无法更改
常量\u I\u希望\u重用\u库的其他文件中的\u