This example demonstrates how to build a library with webpack that has dependencies on other libraries which should not be included in the compiled version.

We use the `libraryTarget: "umd"` option to build a UMD module that is consumable in CommonJS, AMD and with script tags. We don't specify the `library` option so the library is exported to the root namespace.

We use the `externals` option to define dependencies that should be resolved in the target environment.

In the simple case we just need to specify a string (`"add"`). Then it's resolved as `"add"` module in CommonJS and AMD, and as global `add` when used with the script tag.

In the complex case we specify different values for each environment:

| environment        | config value             | resolved as                  |
| ------------------ | ------------------------ | ---------------------------- |
| CommonJS (strict)  | `["./math", "subtract"]` | `require("./math").subtract` |
| CommonJS (node.js) | `"./subtract"`           | `require("./subtract")`      |
| AMD                | `"subtract"`             | `define(["subtract"], ...)`  |
| script tag         | `"subtract"`             | `this.subtract`              |

# example.js

```javascript
_{{example.js}}_
```

# webpack.config.js

```javascript
_{{webpack.config.js}}_
```

# dist/output.js

```javascript
_{{dist/output.js}}_
```

# Info

## Unoptimized

```
_{{stdout}}_
```

## Production mode

```
_{{production:stdout}}_
```