Fix packages mode outside cwd

Resolves #2043

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Unreleased
 
+### Bug Fixes
+
+-   Fixed packages mode for packages outside of cwd (again), #2043.
+
 ## v0.23.12 (2022-08-31)
 
 ### Features

package.json

@@ -40,7 +40,7 @@
     "@types/node": "14",
     "@typescript-eslint/eslint-plugin": "^5.36.1",
     "@typescript-eslint/parser": "^5.36.1",
-    "@typestrong/fs-fixture-builder": "github:TypeStrong/fs-fixture-builder#b88cd06fe814614a0d924af9d10d04ff95a551de",
+    "@typestrong/fs-fixture-builder": "github:TypeStrong/fs-fixture-builder#5a9486bc66f6e36988106685768396281f6cbc10",
     "c8": "^7.12.0",
     "esbuild": "^0.15.6",
     "eslint": "^8.23.0",

src/lib/utils/entry-point.ts

@@ -306,7 +306,8 @@ function deriveRootDir(packageGlobPaths: string[]): string {
     const rootPaths = globs.flatMap((glob) =>
         filterMap(glob.set, (set) => {
             const stop = set.findIndex((part) => typeof part !== "string");
-            return stop === -1 ? set.join("/") : set.slice(0, stop).join("/");
+            const path = stop === -1 ? set : set.slice(0, stop);
+            return `/${path.join("/")}`;
         })
     );
     return getCommonDirectory(rootPaths);

src/test/slow/entry-point.test.ts

@@ -1,6 +1,7 @@
 import { tempdirProject } from "@typestrong/fs-fixture-builder";
 import { deepStrictEqual as equal, ok } from "assert";
 import { join } from "path";
+import { tmpdir } from "os";
 import { Application, EntryPointStrategy, TSConfigReader } from "../..";
 
 const fixture = tempdirProject();
@@ -86,4 +87,28 @@ describe("Entry Points", () => {
         equal(entryPoints.length, 1);
         equal(entryPoints[0].version, void 0);
     });
+
+    it("Supports resolving packages outside of cwd", () => {
+        const fixture = tempdirProject({ rootDir: tmpdir() });
+        fixture.addJsonFile("tsconfig.json", {
+            include: ["."],
+        });
+        fixture.addJsonFile("package.json", {
+            main: "index.ts",
+        });
+        fixture.addFile("index.ts", "export function fromIndex() {}");
+        fixture.write();
+
+        app.bootstrap({
+            tsconfig: tsconfig,
+            entryPoints: [fixture.cwd],
+            entryPointStrategy: EntryPointStrategy.Packages,
+        });
+
+        const entryPoints = app.getEntryPoints();
+        fixture.rm();
+        ok(entryPoints);
+        equal(entryPoints.length, 1);
+        equal(entryPoints[0].version, void 0);
+    });
 });