Adds tests

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

@@ -460,6 +460,108 @@ module.exports = makeTemporaryEnv => {
       ),
     );
 
+    test(
+      `it should support the 'paths' option from require.resolve (same dependency tree)`,
+      makeTemporaryEnv(
+        {
+          private: true,
+          workspaces: [`workspace-*`],
+        },
+        {
+          plugNPlay: true,
+        },
+        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: ${JSON.stringify([
+                `${path}/workspace-a`,
+                `${path}/workspace-b`,
+              ])}}))`,
+            ),
+          ).resolves.toMatchObject({
+            name: `no-deps`,
+            version: `1.0.0`,
+          });
+        },
+      ),
+    );
+
+    // Skipped because not supported (we can't require files from within other dependency trees, since we couldn't
+    // reconcile them together: dependency tree A could think that package X has deps Y@1 while dependency tree B
+    // could think that X has deps Y@2 instead. Since they would share the same location on the disk, PnP wouldn't
+    // be able to tell which one should be used)
+    test.skip(
+      `it should support the 'paths' option from require.resolve (different dependency trees)`,
+      makeTemporaryEnv(
+        {
+          dependencies: {},
+        },
+        {
+          plugNPlay: true,
+        },
+        async ({path, run, source}) => {
+          await run(`install`);
+
+          const tmpA = await createTemporaryFolder();
+          const tmpB = await createTemporaryFolder();
+
+          await writeJson(`${tmpA}/package.json`, {
+            dependencies: {[`no-deps`]: `1.0.0`},
+          });
+
+          await writeJson(`${tmpB}/package.json`, {
+            dependencies: {[`no-deps`]: `2.0.0`, [`one-fixed-dep`]: `1.0.0`},
+          });
+
+          await run(`install`, {
+            cwd: tmpA,
+          });
+
+          await run(`install`, {
+            cwd: tmpB,
+          });
+
+          await expect(
+            source(`require(require.resolve('no-deps', {paths: ${JSON.stringify([tmpA, tmpB])}}))`),
+          ).resolves.toMatchObject({
+            name: `no-deps`,
+            version: `1.0.0`,
+          });
+        },
+      ),
+    );
+
+    test(
+      `using require.resolve with unsupported options should throw`,
+      makeTemporaryEnv(
+        {
+          dependencies: {[`no-deps`]: `1.0.0`},
+        },
+        {
+          plugNPlay: true,
+        },
+        async ({path, run, source}) => {
+          await run(`install`);
+
+          await expect(source(`require.resolve('no-deps', {foobar: 42})`)).rejects.toBeTruthy();
+        },
+      ),
+    );
+
     test(
       `it should load the index.js file when loading from a folder`,
       makeTemporaryEnv({}, {plugNPlay: true}, async ({path, run, source}) => {

src/util/generate-pnp-map-api.tpl.js

@@ -646,15 +646,18 @@ exports.setup = function setup() {
     if (!enableNativeHooks) {
       return originalModuleResolveFilename.call(Module, request, parent, isMain, options);
     }
-    
+
     let issuers;
-    
+
     if (options) {
-      const optionNames = new Set(Object.keys(optionNames));
+      const optionNames = new Set(Object.keys(options));
       optionNames.delete('paths');
-
-      if (options.size > 0) {
-        throw makeError(`UNSUPPORTED`, `Some options passed to require() aren't supported by PnP yet (${Array.from(optionNames).join(', ')})`);
+
+      if (optionNames.size > 0) {
+        throw makeError(
+          `UNSUPPORTED`,
+          `Some options passed to require() aren't supported by PnP yet (${Array.from(optionNames).join(', ')})`,
+        );
       }
 
       if (options.paths) {
@@ -665,15 +668,15 @@ exports.setup = function setup() {
     if (!issuers) {
       const issuerModule = getIssuerModule(parent);
       const issuer = issuerModule ? issuerModule.filename : `${process.cwd()}/`;
-      
+
       issuers = [issuer];
     }
-    
+
     let firstError;
 
     for (const issuer of issuers) {
       let resolution;
-      
+
       try {
         resolution = exports.resolveRequest(request, issuer);
       } catch (error) {
@@ -683,7 +686,7 @@ exports.setup = function setup() {
 
       return resolution !== null ? resolution : request;
     }
-    
+
     throw firstError;
   };