Lift 'nodeLinker' == 'pnp' restriction

package.json

@@ -22,6 +22,7 @@
   },
   "scripts": {
     "build": "./build.js -p",
-    "build-dev": "./build.js"
+    "build-dev": "./build.js",
+    "fmt": "prettier --write src"
   }
 }

src/bin-wrapper-node-modules.sh.in

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec node '@@SCRIPT_PATH@@' "$@"

src/index.ts

@@ -15,10 +15,13 @@ import {
   structUtils,
 } from "@yarnpkg/core";
 
-import binTmpl from "./bin-wrapper.sh.in";
+import binWrapperPnpTmpl from "./bin-wrapper-pnp.sh.in";
+import binWrapperNodeModulesTmpl from "./bin-wrapper-node-modules.sh.in";
 import defaultExprTmpl from "./default.nix.in";
 import projectExprTmpl from "./yarn-project.nix.in";
 
+const supportedLinkers = [`pnp`, `node-modules`];
+
 // Generator function that runs after `yarn install`.
 const generate = async (project: Project, cache: Cache, report: Report) => {
   const { configuration, cwd } = project;
@@ -26,16 +29,6 @@ const generate = async (project: Project, cache: Cache, report: Report) => {
   const cacheFolderAbs = configuration.get(`cacheFolder`);
   const lockfileFilename = configuration.get(`lockfileFilename`);
 
-  // TODO: Should try to remove this. Our binary wrappers currently do
-  // `node -r .pnp.js <bin>`, but not even sure if that's supported.
-  if (configuration.get(`nodeLinker`) !== `pnp`) {
-    report.reportWarning(
-      0,
-      `Currently, yarn-plugin-nixify only supports 'pnp' for the 'nodeLinker' setting.`
-    );
-    return;
-  }
-
   let yarnPath = ppath.relative(cwd, yarnPathAbs);
   if (yarnPath.startsWith(`../`)) {
     yarnPath = yarnPathAbs;
@@ -216,7 +209,22 @@ class InstallBinCommand extends Command<CommandContext> {
       this.context.cwd
     );
 
-    if (workspace) {
+    const report = await StreamReport.start(
+      { configuration, stdout: this.context.stdout },
+      async (report) => {
+        if (!workspace || workspace.manifest.bin.size === 0) {
+          return;
+        }
+
+        let nodeLinker = configuration.get(`nodeLinker`);
+        if (!supportedLinkers.includes(nodeLinker)) {
+          nodeLinker = `node-modules`;
+          report.reportWarning(
+            0,
+            `The nodeLinker ${nodeLinker} is not supported - executables may have trouble finding dependencies`
+          );
+        }
+
         const binDir = npath.toPortablePath(this.binDir);
         const pnpPath = getPnpPath(project).main;
         for (const [name, scriptInput] of workspace.manifest.bin) {
@@ -225,13 +233,29 @@ class InstallBinCommand extends Command<CommandContext> {
             project.cwd,
             npath.toPortablePath(scriptInput)
           );
-        const script = binTmpl
+
+          let script;
+          switch (nodeLinker) {
+            case `pnp`:
+              script = binWrapperPnpTmpl
                 .replace(`@@PNP_PATH@@`, pnpPath)
                 .replace(`@@SCRIPT_PATH@@`, scriptPath);
+              break;
+            case `node-modules`:
+              script = binWrapperNodeModulesTmpl.replace(
+                `@@SCRIPT_PATH@@`,
+                scriptPath
+              );
+              break;
+            default:
+              throw Error(`Invalid nodeLinker ${nodeLinker}`);
+          }
+
           xfs.writeFileSync(binPath, script);
           xfs.chmodSync(binPath, 0o755);
         }
       }
+    );
   }
 }