fix

Author: Rich-Harris

packages/kit/src/core/tsconfig.js

@@ -19,7 +19,7 @@ export function generate_tsconfig(config) {
 const project_relative = (file) => posixify(path.relative('.', file));
 
 /** @param {string} file */
-const config_relative = (file) => posixify(path.join(config.kit.outDir, file));
+const config_relative = (file) => posixify(path.relative(config.kit.outDir, file));
 
 const dirs = new Set([
 project_relative(path.dirname(config.kit.files.routes)),

packages/kit/test/apps/options/tsconfig.json

@@ -7,5 +7,5 @@
 "types": ["../../../types/internal"]
 }
 },
-"extends": "./.svelte-kit/tsconfig.json"
+"extends": "./.custom-out-dir/tsconfig.json"
 }