javascript - Ordering of compiled TypeScript files with Gulp -

i'm having build pipeline based on gulp. use typescript write angular 1.x code. in general follow such process:

1. write code
2. compile javascript
3. use gulp-inject inject files index.html , use in development environment:

a. read files

b. apply gulp-narutal-sort have stable ordering of input files next step

c. apply gulp-angular-filesort have ordering of files

everything worked ok, i've introduced inheritance of clases in typescript. index html has wrong order of dependencies:

• right.leg.js (has rightleg class declared, child of leg )
• left.leg.js (has leftleg class declared, child of leg )
• leg.js (definition of leg class)

and got errors child classes:

right.leg.js:5 uncaught typeerror: cannot read property 'prototype' of undefined 

that caused ordering of files.

question: how resolve kind of file sorting problem?

maybe there kind of plugin gulp?