add installer

.github/workflows/CI.yml

@@ -140,10 +140,13 @@ jobs:
             echo "Prerelease"
             echo "prerelease=true" >> $GITHUB_OUTPUT
           fi
+      - name: Create node package
+        run: tar czvf node.tar.gz install.mjs index.js index.d.ts package.json 
       - name: Create release
         uses: "marvinpinto/action-automatic-releases@latest"
         with:
           repo_token: "${{ secrets.GITHUB_TOKEN }}"
           prerelease: ${{ steps.check-tag.outputs.prerelease == 'true' }}
           files: |
             **/*.node
+            node.tar.gz

install.mjs

@@ -0,0 +1,60 @@
+//@ts-check
+
+import fs from "node:fs/promises"
+import path from "node:path";
+
+// If this program is running on node-altjtalk-binding repo,
+// do not download prebuilt binary
+const isRepo = await fs.access("build.rs").then(() => true, () => false);
+if (isRepo) process.exit(0);
+
+async function isMusl() {
+  // For Node 10
+  if (!process.report || typeof process.report.getReport !== 'function') {
+    try {
+      const lddPath = require('child_process').execSync('which ldd').toString().trim()
+      return (await fs.readFile(lddPath, 'utf8')).includes('musl')
+    } catch (e) {
+      return true
+    }
+  } else {
+    const report = process.report.getReport();
+    const { glibcVersionRuntime } = (typeof report === "object" ? report : JSON.parse(report)).header
+    return !glibcVersionRuntime
+  }
+}
+
+const baseUrl = "https://github.com/femshima/node-altjtalk-binding/releases/download";
+
+const file = new URL(import.meta.url).pathname;
+const dir = path.dirname(file);
+
+const packageJSON = JSON.parse(
+  await fs.readFile(path.join(dir, "package.json"), { encoding: "utf-8" })
+);
+const packageName = packageJSON.name ?? "node-altjtalk-binding";
+const version = `v${packageJSON.version}` ?? "latest";
+
+const { platform, arch } = process;
+
+let suffix = "";
+switch (platform) {
+  case 'win32':
+    suffix = "-msvc";
+    break;
+  case 'linux':
+    suffix = (await isMusl()) ? "-musl" : "-gnu";
+    break;
+}
+
+const fileName = `${packageName}.${platform}-${arch}${suffix}.node`
+
+const url = `${baseUrl}/${version}/${fileName}`
+
+const response = await fetch(url);
+if (!response.ok) {
+  throw new Error(`Fetch failed.\nRequest to ${url} returned status code ${response.status}.`);
+}
+
+const buf = await response.arrayBuffer();
+fs.writeFile(fileName, Buffer.from(buf));

package.json

@@ -34,7 +34,8 @@
     "prepublishOnly": "napi prepublish -t npm",
     "test": "ava",
     "universal": "napi universal",
-    "version": "napi version"
+    "version": "napi version",
+    "postinstall": "node install.mjs"
   },
   "packageManager": "yarn@3.6.4"
 }