JS: missed module error cases

gistfile1.txt

*Compilation JS with gulp-browserify*

Case # 0. Any error in NOT included files

Result: no errors by compilation and running


Case # 1. Missed lib on the disk

app.js

```
import Test from "./test"; // that module is not installed
```

Result: error by compilation
Error in plugin 'gulp-browserify' module "./test" not found from ".../app.js"


Case # 2. Missed including lib in the running code

app.js
```
let id = UUID.create(4).toString();
```
Result: error by running
Uncaught ReferenceError: UUID is not defined


Case # 3. Missed including lib in the NOT running code

app.js
```
() => UUID.create(4).toString();
```
Result: no errors