sass @include works in some files and not others -

i'm using sass library 'bourbon neat'. provides mixin called "outer-container".

i have sass file structured this:

@import bourbon/bourbon @import neat/neat  @import componentone  @import componenttwo 

i want use neat within both files componentone , componenttwo.

within both files have use mixin:

@include outer-container; 

if use mixin within componentone, result want. mixin gets used.

if use mixin within componenttwo, gulp-sass throws error:

error: no mixin named outer-container

   backtrace:       componenttwo.scss     on line 3 of componenttwo.scss 

@include outer-container;

i cheat importing entire library second file. if read sass docs right, mixin should available both componentone.scss , componenttwo.scss, because both @imported file imports library.

what's going on here? how use library in sass files without importing each file?