**Variables inside functions**<br>

Variables inside functions can not be changed by rewire. This is constrained by JavaScript and can't be circumvented by rewire.

(function () {

var someVariable;

})()

**Modules that export primitives**<br>

rewire is not able to attach the`__set__`- and`__get__`-method if your module is just exporting a primitive. Rewiring does not work in this case.

module.exports=2;

**Globals with invalid variable names**<br>

rewire imports global variables into the local scope by prepending a list of`var` declarations:

var someGlobalVar=global.someGlobalVar;

If`someGlobalVar` is not a valid variable name, rewire just ignores it.**In this case you're not able to override the global variable locally**.

**Special globals**<br>

Please be aware that you can't rewire`eval()` or the global object itself.

**Difference to require()**<br>

This replaces`console` just inside`myModule`. That is, because rewire is using`eval()` to turn the key expression into an assignment. Hence, calling`myModule.__set__("console.log", fn)` modifies the`log` function on the*global*`console` object.

**Globals with invalid variable names**<br>

rewire imports global variables into the local scope by prepending a list of`var` declarations:

var someGlobalVar=global.someGlobalVar;

If`someGlobalVar` is not a valid variable name, rewire just ignores it.**In this case you're not able to override the global variable locally**.

**Special globals**<br>

Please be aware that you can't rewire`eval()` or the global object itself.

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API