error TS5053: Option 'declarationDir' cannot be specified with option 'outFile'.

Attempting to change the declaration file output directory, I get the following error: > error TS5053: Option 'declarationDir' cannot be specified with option 'outFile'. `tsconfig.json` looks like this: ``` { "$schema": "http://json.schemastore.org/tsconfig", "compilerOptions": { "module": "amd", "target": "es6", "outFile": "../assets/js/main.js", "sourceMap": true, "declaration": true, "declarationDir": "../" } } ``` I want my `.d.ts` file emitted somewhere else, since that's not a public asset. Why is this not permitted? I'm forced to create two (near-identical) `tsconfig` files and run the compiler twice to get the declaration file and output file. What for?