JavaScript's Scoped Exports concept

Question

JavaScript's Scoped Exports concept

After exporting something in JavaScript, let's consider a scenario where we have a file named 'foo.js' with the line:

export default foo;

This allows us to import it globally from any other file. But what if there is a need to restrict this?

Let's present a challenge:

Imagine an application 'X' consisting of modules 'A' and 'B'.
Both modules 'A' and 'B' have a file 'parser.js' that exports functions with identical names.
Assuming 'A' and 'B' are separate modules, ideally they shouldn't access functions outside their own scope.
Due to global exports, during development one may unintentionally use functions from both 'parser.js' files.

Is there a way to limit the usage of exported modules within a specific scope?

If not, are there alternative solutions to address this issue creatively?

Seeking suggestions to enhance development processes at scale :)

javascript ecmascript-6 ecmascript-next

Answer 1

Answer №1

To prevent naming conflicts, you can utilize aliasing:

import {
  foo,
} from './some/path';

import {
  foo as bar,
} from './some/other/path';

Many libraries have a main entry point (usually index.js) that exports the functionality of sub-modules. By not exporting the module you want hidden, you can control accessibility. It's worth noting that while someone could still import the hidden sub-module directly by specifying its path in the node_modules folder, this practice is risky and should be avoided.

When it comes to application code, consider wrapping it in a library added to package.json from a git URL, or simply commenting out the code or renaming it. Using Typescript can also help, as functions with different type signatures will prevent unintended use.

Ultimately, having trust in your fellow developers is key. Excessive effort to prevent unlikely mistakes is often unnecessary.

EDIT based on comment

You can namespace imports like this:

import * as Whatever from 'some-module';

Whatever.someFn();

Answer 2

To prevent naming conflicts, you can utilize aliasing:

import {
  foo,
} from './some/path';

import {
  foo as bar,
} from './some/other/path';

Many libraries have a main entry point (usually index.js) that exports the functionality of sub-modules. By not exporting the module you want hidden, you can control accessibility. It's worth noting that while someone could still import the hidden sub-module directly by specifying its path in the node_modules folder, this practice is risky and should be avoided.

When it comes to application code, consider wrapping it in a library added to package.json from a git URL, or simply commenting out the code or renaming it. Using Typescript can also help, as functions with different type signatures will prevent unintended use.

Ultimately, having trust in your fellow developers is key. Excessive effort to prevent unlikely mistakes is often unnecessary.

EDIT based on comment

You can namespace imports like this:

import * as Whatever from 'some-module';

Whatever.someFn();

JavaScript's Scoped Exports concept

Answer №1

EDIT based on comment

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