@@ -4,6 +4,7 @@ import { parse } from "yaml";
44import {
55collectCurrentShrinkwrapOverrides,
66collectPnpmLockViolations,
7+mergeOverrides,
78parsePnpmPackageKey,
89readShrinkwrapOverrides,
910} from "../scripts/generate-npm-shrinkwrap.mjs";
@@ -132,6 +133,82 @@ describe("package manager build policy", () => {
132133});
133134});
134135136+it("merges exact current shrinkwrap pins with nested lock-derived pins", () => {
137+expect(
138+mergeOverrides(
139+{ "@mistralai/mistralai": "2.2.1" },
140+{ "@mistralai/mistralai": { ".": "2.2.1", zod: "4.4.3" } },
141+{},
142+),
143+).toEqual({
144+"@mistralai/mistralai": { ".": "2.2.1", zod: "4.4.3" },
145+});
146+});
147+148+it("preserves npm alias pins when merging nested lock-derived pins", () => {
149+expect(
150+mergeOverrides(
151+{ "node-domexception": "npm:@nolyfill/domexception@1.0.28" },
152+{ "node-domexception": { ".": "1.0.28", child: "2.0.0" } },
153+{},
154+),
155+).toEqual({
156+"node-domexception": {
157+".": "npm:@nolyfill/domexception@1.0.28",
158+child: "2.0.0",
159+},
160+});
161+});
162+163+it("preserves later npm alias pins when nested pins are already merged", () => {
164+expect(
165+mergeOverrides(
166+{ "node-domexception": { ".": "1.0.28", child: "2.0.0" } },
167+{ "node-domexception": "npm:@nolyfill/domexception@1.0.28" },
168+{},
169+),
170+).toEqual({
171+"node-domexception": {
172+".": "npm:@nolyfill/domexception@1.0.28",
173+child: "2.0.0",
174+},
175+});
176+});
177+178+it("rejects non-exact root pins when merging nested pins", () => {
179+expect(() =>
180+mergeOverrides(
181+{ "floating-package": "^1.0.0" },
182+{ "floating-package": { ".": "~1.0.0", child: "2.0.0" } },
183+{},
184+),
185+).toThrow(/conflicts with pnpm lock policy/u);
186+expect(() =>
187+mergeOverrides(
188+{ "floating-package": { ".": "^1.0.0", child: "2.0.0" } },
189+{ "floating-package": "~1.0.0" },
190+{},
191+),
192+).toThrow(/conflicts with pnpm lock policy/u);
193+});
194+195+it("rejects distinct npm alias targets with matching versions", () => {
196+expect(() =>
197+mergeOverrides(
198+{ "aliased-package": "npm:@safe/foo@1.0.0" },
199+{ "aliased-package": { ".": "npm:@other/foo@1.0.0", child: "2.0.0" } },
200+{},
201+),
202+).toThrow(/conflicts with pnpm lock policy/u);
203+expect(() =>
204+mergeOverrides(
205+{ "aliased-package": { ".": "npm:@safe/foo@1.0.0", child: "2.0.0" } },
206+{ "aliased-package": "npm:@other/foo@1.0.0" },
207+{},
208+),
209+).toThrow(/conflicts with pnpm lock policy/u);
210+});
211+135212it("keeps npm shrinkwrap package versions inside the pnpm lock graph", () => {
136213const pnpmLockPackages = collectPnpmLockPackages();
137214const shrinkwrapPaths = [
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