Discover pkgs from volta and corepack

And discover yarn and pnpm from engines.

fixtures/package.json/engines/package.json

@@ -1,7 +1,9 @@
 {
   "engines": {
     "node": "~16.16.1",
-    "npm": "~9.7.1"
+    "npm": "~9.7.1",
+    "yarn": "~1.22.10",
+    "pnpm": "~7.33.7"
   }
 }
 

fixtures/package.json/packageManager/package.json

@@ -0,0 +1,4 @@
+{
+  "packageManager": "[email protected]+sha256.d1581d46ed10f54ff0cbdd94a2373b1f070202b0fbff29f27c2ce01460427043"
+}
+

fixtures/package.json/volta/package.json

@@ -0,0 +1,9 @@
+{
+  "volta": {
+    "node": "16.16.1",
+    "npm": "9.7.1",
+    "yarn": "1.22.10",
+    "pnpm": "7.33.7"
+  }
+}
+

src/utils/devenv.test.ts

@@ -64,6 +64,20 @@ Deno.test("devenv.ts", async runner => {
           'package.json/engines/package.json',
           'nodejs.org~16.16.1',
           'npmjs.com~9.7.1',
+          'yarnpkg.com~1.22.10',
+          'pnpm.io~7.33.7',
+        ],
+        [
+          'package.json/packageManager/package.json',
+          '[email protected]',
+          'nodejs.org'
+        ],
+        [
+          'package.json/volta/package.json',
+          '[email protected]',
+          '[email protected]',
+          '[email protected]',
+          '[email protected]',
         ],
         [".node-version", "[email protected]"],
         ["python-version/std/.python-version", "python.org~3.10"],

src/utils/devenv.ts

@@ -178,13 +178,59 @@ export default async function(dir: Path) {
     const json = JSON.parse(await path.read());
     let node = json?.pkgx;
     if (isString(node) || isArray(node)) node = { dependencies: node }
-    if (!node && json?.engines) {
-      node = {
-        dependencies: {
-          ...(json.engines.node && { 'nodejs.org': json.engines.node }),
-          ...(json.engines.npm && { 'npmjs.com': json.engines.npm }),
-        },
-      };
+    if (!node) {
+      if (json?.engines) {
+        node = {
+          dependencies: {
+            ...(json.engines.node && { 'nodejs.org': json.engines.node }),
+            ...(json.engines.npm && { 'npmjs.com': json.engines.npm }),
+            ...(json.engines.yarn && { 'yarnpkg.com': json.engines.yarn }),
+            ...(json.engines.pnpm && { 'pnpm.io': json.engines.pnpm }),
+          },
+        };
+      }
+      if (json?.packageManager) { // corepack
+        // example: "[email protected]+sha256.d1581d46ed10f54ff0cbdd94a2373b1f070202b0fbff29f27c2ce01460427043"
+        const match = json.packageManager.match(/^(?<pkg>[^@]+)@(?<version>[^+]+)/);
+
+        if (match) {
+          const { pkg, version } = match.groups as { pkg: string, version: string };
+
+          switch (pkg) {
+            case 'npm':
+              node = {
+                dependencies: {
+                  'npmjs.com': version,
+                },
+              };
+              break;
+            case 'yarn':
+              node = {
+                dependencies: {
+                  'yarnpkg.com': version,
+                },
+              };
+              break;
+            case 'pnpm':
+              node = {
+                dependencies: {
+                  'pnpm.io': version,
+                },
+              };
+              break;
+          };
+        }
+      }
+      if (json?.volta) {
+        node = {
+          dependencies: {
+            ...(json.volta.node && { 'nodejs.org': json.volta.node }),
+            ...(json.volta.npm && { 'npmjs.com': json.volta.npm }),
+            ...(json.volta.yarn && { 'yarnpkg.com': json.volta.yarn }),
+            ...(json.volta.pnpm && { 'pnpm.io': json.volta.pnpm }),
+          }
+        }
+      }
     }
     await parse_well_formatted_node(node)
     has_package_json = true