feat: support ARM64 musl targets (#47)

Author: nflaig

README.md

@@ -545,6 +545,7 @@ Add a `zapi` field to your `package.json`:
       "x86_64-unknown-linux-gnu",
       "x86_64-unknown-linux-musl",
       "aarch64-unknown-linux-gnu",
+      "aarch64-unknown-linux-musl",
       "x86_64-apple-darwin",
       "aarch64-apple-darwin",
       "x86_64-pc-windows-msvc"
@@ -560,6 +561,7 @@ Add a `zapi` field to your `package.json`:
 | `aarch64-apple-darwin` | macOS | arm64 | - |
 | `x86_64-apple-darwin` | macOS | x64 | - |
 | `aarch64-unknown-linux-gnu` | Linux | arm64 | glibc |
+| `aarch64-unknown-linux-musl` | Linux | arm64 | musl |
 | `x86_64-unknown-linux-gnu` | Linux | x64 | glibc |
 | `x86_64-unknown-linux-musl` | Linux | x64 | musl |
 | `x86_64-pc-windows-msvc` | Windows | x64 | msvc |

examples/targets/mod.test.ts

@@ -0,0 +1,32 @@
+import {afterEach, describe, expect, it, vi} from "vitest";
+
+afterEach(() => {
+	vi.doUnmock("node:fs");
+	vi.resetModules();
+});
+
+describe("aarch64 musl target", () => {
+	it("maps package and Zig target metadata", async () => {
+		const {getTargetParts} = await import("../../ts/config.js");
+		const {TARGETS, getZigTriple} = await import("../../ts/lib.js");
+
+		expect(TARGETS).toContain("aarch64-unknown-linux-musl");
+		expect(getZigTriple("aarch64-unknown-linux-musl")).toBe("aarch64-linux-musl");
+		expect(getTargetParts("aarch64-unknown-linux-musl")).toEqual({
+			abi: "musl",
+			arch: "arm64",
+			platform: "linux",
+		});
+	});
+
+	it("selects the target on an ARM64 musl runtime", async () => {
+		vi.doMock("node:fs", async () => {
+			const fs = await vi.importActual<typeof import("node:fs")>("node:fs");
+			return {...fs, readFileSync: vi.fn(() => "musl libc")};
+		});
+
+		const {getTarget} = await import("../../ts/lib.js");
+
+		expect(getTarget("linux", "arm64")).toBe("aarch64-unknown-linux-musl");
+	});
+});

ts/config.ts

@@ -100,6 +100,11 @@ export function getTargetParts(target: Target): {platform: NodeJS.Platform; arch
       arch = "arm64";
       abi = "gnu";
       break;
+    case "aarch64-unknown-linux-musl":
+      platform = "linux";
+      arch = "arm64";
+      abi = "musl";
+      break;
     case "x86_64-apple-darwin":
       platform = "darwin";
       arch = "x64";

ts/lib.ts

@@ -9,6 +9,7 @@ const require = createRequire(import.meta.url);
 export const TARGETS = [
   "aarch64-apple-darwin",
   "aarch64-unknown-linux-gnu",
+  "aarch64-unknown-linux-musl",
   "x86_64-apple-darwin",
   "x86_64-unknown-linux-gnu",
   "x86_64-unknown-linux-musl",
@@ -121,6 +122,8 @@ export function getZigTriple(target: Target): string {
       return "x86_64-linux-musl";
     case "aarch64-unknown-linux-gnu":
       return "aarch64-linux-gnu";
+    case "aarch64-unknown-linux-musl":
+      return "aarch64-linux-musl";
     case "x86_64-apple-darwin":
       return "x86_64-macos-none";
     case "aarch64-apple-darwin":
@@ -189,7 +192,7 @@ export function getTarget(platform: NodeJS.Platform, arch: NodeJS.Architecture):
     }
   } else if (platform === "linux") {
     const abi = isMusl() ? "musl" : "gnu";
-    if (arch === "arm64" && abi === "gnu") {
+    if (arch === "arm64") {
       return `aarch64-unknown-linux-${abi}`;
     }
     if (arch === "x64") {