Coverage with Webpack not work

I have this config:
It works but coverage is on test files only. So 100% :-)).
I need coverage only on .ts files, but I dont know how set preprocessor only to .ts files.
```
module.exports = function (config) {
config.set({
frameworks: ["jasmine", "webpack"],
reporters: ['progress', 'coverage'],
files: [
{
pattern: `${outputPath}/**/*`, // <-- here
watched: false,
included: false
},
"./test/boot.spec.ts",
"./src/app/**/*.ts", // *.tsx for React Jsx
"./test/**/*.ts" // *.tsx for React Jsx
],
preprocessors: {
// add webpack as preprocessor
'test/**/*.ts': ['webpack', 'coverage']
},
coverageReporter: {
type : 'html',
dir : '../coverage/Pico'
},
webpack: webpackConfig,
browsers: ["Chrome"],
logLevel: config.LOG_ERROR
});
};
```

I try this:
```
module.exports = function (config) {
config.set({
frameworks: ["jasmine", "webpack"],
reporters: ['progress', 'coverage'],
files: [
{
pattern: `${outputPath}/**/*`, // <-- here
watched: false,
included: false
},
"./test/boot.spec.ts",
"./src/app/**/*.ts", // *.tsx for React Jsx
"./test/**/*.ts" // *.tsx for React Jsx
],
preprocessors: {
// add webpack as preprocessor
'test/**/*.ts': ['webpack'],
"./src/app/**/*.ts": ['webpack', 'coverage']
},
coverageReporter: {
type : 'html',
dir : '../coverage/Pico'
},
webpack: webpackConfig,
browsers: ["Chrome"],
logLevel: config.LOG_ERROR
});
};
```
But I got error: ultiple assets emit different content to the same filename on assets, bcs Loaded more than once.

Any Idea?