feat: add resolvePackage

Author: velut

lib/utils/resolve-package.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "vitest";
+import { resolvePackage } from "./resolve-package";
+
+test("bare name", () => {
+	expect(resolvePackage("foo", ["foo@1.0.0", "bar@1.0.0", "@foo/bar@1.0.0"])).toMatchInlineSnapshot(
+		`"foo@1.0.0"`,
+	);
+});
+
+test("scoped name", () => {
+	expect(
+		resolvePackage("@foo/bar", ["foo@1.0.0", "bar@1.0.0", "@foo/bar@1.0.0"]),
+	).toMatchInlineSnapshot(`"@foo/bar@1.0.0"`);
+});

lib/utils/resolve-package.ts

@@ -0,0 +1,5 @@
+export function resolvePackage(pkgName: string, packages: string[]): string {
+	// For the given package name (e.g., `foo`), find the corresponding installed
+	// version ID (e.g., `foo@1.0.0`) in the list of installed packages.
+	return packages.find((pkg) => pkg.startsWith(`${pkgName}@`))!;
+}