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+---
+title: javascript-module-cheatsheet
+type: cheatsheet
+tags: javascript,cheatsheet
+authors: chalarangelo
+cover: blog_images/javascript-swap-two-variables.jpg
+excerpt: Learn everything you need to know about JavaScript modules with this handy cheatsheet.
+---
+
+**Named exports**
+
+```js
+/* environment.js */
+export const key = 'this-is-a-secret';
+
+/* index.js */
+import { key } from 'environment';
+```
+
+- Named exports use a name.
+- A module can have any number of named exports.
+- Import and export name should be the same.
+- Importing requires `{}`.
+
+**Default exports**
+
+```js
+/* environment.js */
+const environment = {
+  key: 'this-is-a-secret',
+  port: 8000
+};
+
+export default environment;
+/* index.js */
+import environment from 'environment';
+
+const { key, port } = environment;
+```
+
+- Default exports expose a default value, use the `default` keyword.
+- A module can only have one default export.
+- Import name can be anything.
+- Importing does not require `{}`.
+
+**Default + named**
+
+```js
+/* environment.js */
+export const envType = 'DEV';
+
+const environment = {
+  key: 'this-is-a-secret',
+  port: 8000
+};
+
+export default environment;
+
+/* index.js */
+import { envType }, environment from 'environment';
+
+const { key, port } = environment;
+```
+
+- Default and named exports can be mixed.
+- Rules about number of exports and naming conventions apply as before.
+- Import rules apply as before, can be mixed if necessary.
+
+**Export list**
+
+```js
+/* environment.js */
+const key = 'this-is-a-secret';
+const port = 8000;
+
+export {
+  key,
+  port
+};
+
+/* index.js */
+import { key, port } from 'environment';
+```
+
+- An export list is a compact way to write multiple named exports.
+- Rules about number of exports, naming conventions and import rules are the same as those of named exports.
+- Export lists are not objects.
+
+**Rename export**
+
+```js
+/* environment.js */
+const key = 'this-is-a-secret';
+
+export { key as authKey };
+
+/* index.js */
+import { authKey } from 'environment';
+```
+
+- Named exports can make use of the `as` keyword to rename an export.
+- Import name should be the same as the renamed export.
+
+**Rename import**
+
+```js
+/* environment.js */
+export const key = 'this-is-a-secret';
+
+/* index.js */
+import { key as authKey } from 'environment';
+```
+
+- Named imports can make use of the `as` keyword to rename an import.
+- Import name (before the `as` keyword) should be the same as the export.
+
+**Import all**
+
+```js
+/* environment.js */
+export const envType = 'DEV';
+
+const environment = {
+  key: 'this-is-a-secret',
+  port: 8000
+};
+
+export default environment;
+
+/* index.js */
+import * as env from 'environment';
+
+const { default: { key, port}, envType } = environment;
+```
+
+- Use `*` to import everything a module exports.
+- Named exports will be available by their names on the imported object.
+- Default export will be available as the `default` key on the imported object.
+
+**Image credit:** [roman manukyan](https://unsplash.com/@romanukyan?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText) on [Unsplash](https://unsplash.com/s/photos/code?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText)