TypeScript 3.9: Type files are behaving like included files

I'm trying to use the new TypeScript code editor support for solution projects and it's working pretty well, but has the issue mentioned in the title. When I add typeRoots or a type file, the referenced file isn't used just to get types from it. Instead, it acts like an included file for that project and the file's type checking follows that project configuration in the editor. tsconfig.json ```json { "files": [], "references": [ { "path": "./tsconfig.client.json" }, { "path": "./tsconfig.server.json" }, { "path": "./tsconfig.shared.json" } ] } ``` tsconfig.base.json ```json { "compilerOptions": { "baseUrl": "./", "composite": true, "declarationDir": "./@types", "emitDeclarationOnly": true, "lib": [ "ES5" ], "target": "ES5", "typeRoots": [ "node_modules/@types/", "lib/types/" ] } } ``` tsconfig.client.json ```json { "extends": "./tsconfig.base.json", "compilerOptions": { "lib": [ "ES6", "DOM" ], "target": "ES6", "types": [ "client", "shared" // This line is the problem ] }, "exclude": [ "lib/types/shared/" ], "include": [ "lib/types/client/" ] } ``` tsconfig.shared.json ```json { "extends": "./tsconfig.base.json", "compilerOptions": { "types": [ "shared" ] }, "include": [ "lib/types/shared/" ] } ``` lib/types/shared/index.d.ts ```typescript type ShouldNotHaveDomLib = Element; // This works, but should output an error ``` It seems like an issue with VSCode as building the project with "tsc --build" does throw the expected error: > lib/types/shared/index.d.ts:1:28 - error TS2304: Cannot find name 'Element'. > >1 type ShouldNotHaveDomLib = Element; I found that removing the "shared" types from tsconfig.client.json made the client types unavaliable as expected, but then made the server ones avaliable, as the "server" project is the second on the reference list. With this, I…