limits - $lim _{ nrightarrow infty }{ { left( -1+frac { 1 }{ n } right) }^{ n } } =?$

We know that $$\lim _{ n\rightarrow \infty }{ { \left( 1-\frac { 1 }{ n } \right) }^{ n } } =\frac { 1 }{ e } .$$ However the result of $$\lim _{ n\rightarrow \infty }{ { \left( -1+\frac { 1 }{ n } \right) }^{ n } }$$ is shown in complex form by Wolframalpha . Why complex numbers?

Yes, $-1+\frac { 1 }{ n } < 0$, but if we write the values from $n=1,2..,10$ , all values will be real. Any opinion? How do you calculate this limit?