fix(pnp): Avoid infinite loop in findApiPathFor

.eslintignore

@@ -1,3 +1,5 @@
+/packages/yarnpkg-pnp/sources/hook.js
+
 /packages/yarnpkg-libzip/sources/libzipAsync.js
 /packages/yarnpkg-libzip/sources/libzipSync.js
 

.yarn/versions/45869421.yml

@@ -0,0 +1,34 @@
+releases:
+  "@yarnpkg/cli": prerelease
+  "@yarnpkg/fslib": prerelease
+  "@yarnpkg/pnp": prerelease
+
+declined:
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-exec"
+  - "@yarnpkg/plugin-file"
+  - "@yarnpkg/plugin-git"
+  - "@yarnpkg/plugin-github"
+  - "@yarnpkg/plugin-http"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-link"
+  - "@yarnpkg/plugin-node-modules"
+  - "@yarnpkg/plugin-npm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-pack"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - vscode-zipfs
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"
+  - "@yarnpkg/json-proxy"
+  - "@yarnpkg/pnpify"
+  - "@yarnpkg/shell"

packages/acceptance-tests/pkg-tests-specs/sources/pnp.test.js

@@ -560,6 +560,46 @@ describe(`Plug'n'Play`, () => {
     ),
   );
 
+  testIf(
+    () => satisfies(process.versions.node, `>=8.9.0`),
+    `it should terminate when the 'paths' option from require.resolve includes empty string and there is no .pnp.js in the working dir`,
+    makeTemporaryEnv(
+      {
+        private: true,
+        workspaces: [`workspace-*`],
+      },
+      async ({path, run, source}) => {
+        await writeJson(`${path}/workspace-a/package.json`, {
+          name: `workspace-a`,
+          version: `1.0.0`,
+          dependencies: {[`no-deps`]: `1.0.0`},
+        });
+
+        await writeJson(`${path}/workspace-b/package.json`, {
+          name: `workspace-b`,
+          version: `1.0.0`,
+          dependencies: {[`no-deps`]: `2.0.0`, [`one-fixed-dep`]: `1.0.0`},
+        });
+
+        await run(`install`);
+
+        await expect(
+          source(
+            `require(require.resolve('no-deps', {paths: ${JSON.stringify([
+              `${npath.fromPortablePath(path)}/workspace-a`,
+              `${npath.fromPortablePath(path)}/workspace-b`,
+              ``,
+            ])}}))`,
+            {cwd: `${path}/workspace-a`}
+          ),
+        ).resolves.toMatchObject({
+          name: `no-deps`,
+          version: `1.0.0`,
+        });
+      },
+    ),
+  );
+
   // Skipped because not supported (we can't require files from within other dependency trees, since we couldn't
   // reconcile them together: dependency tree A could think that package X has deps Y@1 while dependency tree B
   // could think that X has deps Y@2 instead. Since they would share the same location on the disk, PnP wouldn't