Rollup does not bundle declaration file - node.js

Question

I am trying to build a library made with TypeScript. I am using the paths property in tsconfig.json.
My tsconfig.json looks like this:
{
"compilerOptions": {
"module": "es2015",
"moduleResolution": "node",
"target": "es2015",
"noImplicitAny": true,
"removeComments": true,
"preserveConstEnums": true,
"experimentalDecorators": true,
"sourceMap": true,
"lib": [
"esnext",
"dom"
],
"strict": true,
"sourceRoot": "./src",
"rootDir": "./src",
"outDir": "build",
"declaration": true,
"declarationDir": "build",
"baseUrl": "./src",
"noUnusedLocals": true,
"paths": {
"modules/*": [
"modules/*"
],
"common/*": [
"common/*"
]
}
},
"exclude": [
"node_modules",
"build"
]
}
And my rollup config looks like this:
import typescript from 'rollup-plugin-typescript2'
export default {
entry: "./src/index.ts",
output: {
file: './build/index.js',
format: 'cjs'
},
plugins: [
typescript({ typescript: require("typescript"), declaration: true, clean: true })
]
}
However, when I build using rollup -c, it creates this in my build folder:
Where the index.js is bundled just fine, but the declaration file here simply imports from the /common folder and that folder basically contains all the other folders from the src directory but only with a single declaration file per folder, furthermore, these files try to import using the paths aliases instead of being built with relative imports, so they do not work.
How do I tell rollup to build a single declaration file instead of this?

Answer 1

rollup-plugin-typescript keeps the folder structure for declaration files. To bundle the declaration too, you should use rollup-plugin-ts as well:
https://github.com/wessberg/rollup-plugin-ts