chore: import upstream snapshot with attribution

npm/platform.js

@@ -0,0 +1,86 @@
+#!/usr/bin/env node
+
+"use strict";
+
+const os = require("os");
+const path = require("path");
+const fs = require("fs");
+const { spawnSync } = require("child_process");
+
+const { supportedPlatforms } = require("./package.json");
+
+/**
+ * Map Node.js os.type() and os.arch() to Rust-style target triples.
+ */
+function getPlatformKey() {
+  const rawOs = os.type();
+  const rawArch = os.arch();
+
+  let osType;
+  switch (rawOs) {
+    case "Windows_NT":
+      osType = "pc-windows-msvc";
+      break;
+    case "Darwin":
+      osType = "apple-darwin";
+      break;
+    case "Linux":
+      osType = "unknown-linux-gnu";
+      break;
+    default:
+      throw new Error(`Unsupported operating system: ${rawOs}`);
+  }
+
+  let arch;
+  switch (rawArch) {
+    case "x64":
+      arch = "x86_64";
+      break;
+    case "arm64":
+      arch = "aarch64";
+      break;
+    default:
+      throw new Error(`Unsupported architecture: ${rawArch}`);
+  }
+
+  // On Linux, try to detect musl libc
+  if (rawOs === "Linux") {
+    try {
+      const result = spawnSync("ldd", ["--version"], {
+        encoding: "utf8",
+        stdio: ["pipe", "pipe", "pipe"],
+      });
+      // musl ldd prints version info to stderr
+      const output = (result.stdout || "") + (result.stderr || "");
+      if (output.toLowerCase().includes("musl")) {
+        osType = "unknown-linux-musl";
+      }
+    } catch {
+      // If ldd fails, assume glibc
+    }
+  }
+
+  const key = `${arch}-${osType}`;
+
+  if (!supportedPlatforms[key]) {
+    // Try musl fallback on Linux if glibc binary is not available
+    if (rawOs === "Linux") {
+      const muslKey = `${arch}-unknown-linux-musl`;
+      if (supportedPlatforms[muslKey]) {
+        return muslKey;
+      }
+    }
+    throw new Error(
+      `Unsupported platform: ${key}\nSupported platforms: ${Object.keys(supportedPlatforms).join(", ")}`,
+    );
+  }
+
+  return key;
+}
+
+function getPlatform() {
+  const key = getPlatformKey();
+  return supportedPlatforms[key];
+}
+
+module.exports = { getPlatform, getPlatformKey };