Package managers cannot handle nested optionalDependencies

lib/sharp.js

@@ -9,6 +9,7 @@ const { familySync, versionSync } = require('detect-libc');
 
 const { runtimePlatformArch, prebuiltPlatforms, minimumLibvipsVersion } = require('./libvips');
 const runtimePlatform = runtimePlatformArch();
+const [isLinux, isMacOs, isWindows] = ['linux', 'darwin', 'win32'].map(os => runtimePlatform.startsWith(os));
 
 /* istanbul ignore next */
 try {
@@ -29,11 +30,15 @@ try {
     help.push('Possible solutions:');
     // Common error messages
     if (prebuiltPlatforms.includes(runtimePlatform)) {
-      help.push(`- Add an explicit dependency for the runtime platform: "npm install --force @sharpen/sharp-${runtimePlatform}"`);
+      help.push('- Add explicit dependencies for the runtime platform:');
+      help.push(`    npm install --force @sharpen/sharp-${runtimePlatform}`);
+      if (!isWindows) {
+        help.push(`    npm install --force @sharpen/sharp-libvips-${runtimePlatform}`);
+      }
     } else {
       help.push(`- The ${runtimePlatform} platform requires manual installation of libvips >= ${minimumLibvipsVersion}`);
     }
-    if (runtimePlatform.startsWith('linux') && /symbol not found/i.test(errPackage)) {
+    if (isLinux && /symbol not found/i.test(errPackage)) {
       try {
         const { engines } = require(`@sharpen/sharp-libvips-${runtimePlatform}/package`);
         const libcFound = `${familySync()} ${versionSync()}`;
@@ -41,16 +46,17 @@ try {
         help.push(`- Update your OS: found ${libcFound}, requires ${libcRequires}`);
       } catch (errEngines) {}
     }
-    if (runtimePlatform.startsWith('darwin') && /Incompatible library version/.test(errLocal.message)) {
+    if (isMacOs && /Incompatible library version/.test(errLocal.message)) {
-      help.push('- Update Homebrew: "brew update && brew upgrade vips"');
+      help.push('- Update Homebrew:');
+      help.push('    brew update && brew upgrade vips');
     }
     if (errPackage.code === 'ERR_DLOPEN_DISABLED') {
       help.push('- Run Node.js without using the --no-addons flag');
     }
     // Link to installation docs
-    if (runtimePlatform.startsWith('linux') && /Module did not self-register/.test(errLocal.message + errPackage.message)) {
+    if (isLinux && /Module did not self-register/.test(errLocal.message + errPackage.message)) {
       help.push('- Using worker threads on Linux? See https://sharp.pixelplumbing.com/install#worker-threads');
-    } else if (runtimePlatform.startsWith('win32') && /The specified procedure could not be found/.test(errPackage.message)) {
+    } else if (isWindows && /The specified procedure could not be found/.test(errPackage.message)) {
       help.push('- Using the canvas package on Windows? See https://sharp.pixelplumbing.com/install#canvas-and-windows');
     } else {
       help.push('- Consult the installation documentation: https://sharp.pixelplumbing.com/install');

npm/darwin-arm64/package.json

@@ -13,9 +13,6 @@
     "url": "https://opencollective.com/libvips"
   },
   "preferUnplugged": true,
-  "optionalDependencies": {
-    "@sharpen/sharp-libvips-darwin-arm64": "0.0.1-alpha.1"
-  },
   "files": [
     "lib"
   ],

npm/darwin-x64/package.json

@@ -13,9 +13,6 @@
     "url": "https://opencollective.com/libvips"
   },
   "preferUnplugged": true,
-  "optionalDependencies": {
-    "@sharpen/sharp-libvips-darwin-x64": "0.0.1-alpha.1"
-  },
   "files": [
     "lib"
   ],

npm/linux-arm/package.json

@@ -13,9 +13,6 @@
     "url": "https://opencollective.com/libvips"
   },
   "preferUnplugged": true,
-  "optionalDependencies": {
-    "@sharpen/sharp-libvips-linux-arm": "0.0.1-alpha.1"
-  },
   "files": [
     "lib"
   ],

npm/linux-arm64/package.json

@@ -13,9 +13,6 @@
     "url": "https://opencollective.com/libvips"
   },
   "preferUnplugged": true,
-  "optionalDependencies": {
-    "@sharpen/sharp-libvips-linux-arm64": "0.0.1-alpha.1"
-  },
   "files": [
     "lib"
   ],

npm/linux-x64/package.json

@@ -13,9 +13,6 @@
     "url": "https://opencollective.com/libvips"
   },
   "preferUnplugged": true,
-  "optionalDependencies": {
-    "@sharpen/sharp-libvips-linux-x64": "0.0.1-alpha.1"
-  },
   "files": [
     "lib"
   ],

npm/linuxmusl-arm64/package.json

@@ -13,9 +13,6 @@
     "url": "https://opencollective.com/libvips"
   },
   "preferUnplugged": true,
-  "optionalDependencies": {
-    "@sharpen/sharp-libvips-linuxmusl-arm64": "0.0.1-alpha.1"
-  },
   "files": [
     "lib"
   ],

npm/linuxmusl-x64/package.json

@@ -13,9 +13,6 @@
     "url": "https://opencollective.com/libvips"
   },
   "preferUnplugged": true,
-  "optionalDependencies": {
-    "@sharpen/sharp-libvips-linuxmusl-x64": "0.0.1-alpha.1"
-  },
   "files": [
     "lib"
   ],