Infer compression method from URL

Using the downloaded path is unreliable since we may have removed the file extension.

lib/tar.js

@@ -25,6 +25,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.isZstdAvailable = isZstdAvailable;
 exports.extract = extract;
+exports.inferCompressionMethod = inferCompressionMethod;
 const toolrunner_1 = require("@actions/exec/lib/toolrunner");
 const toolcache = __importStar(require("@actions/tool-cache"));
 const safe_which_1 = require("@chrisgavin/safe-which");
@@ -89,21 +90,23 @@ async function isZstdAvailable(logger) {
         return { available: false };
     }
 }
-async function extract(path) {
-    if (path.endsWith(".tar.gz")) {
-        return {
-            compressionMethod: "gzip",
+async function extract(path, compressionMethod) {
+    switch (compressionMethod) {
+        case "gzip":
             // While we could also ask tar to autodetect the compression method,
             // we defensively keep the gzip call identical as requesting a gzipped
             // bundle will soon be a fallback option.
-            outputPath: await toolcache.extractTar(path),
-        };
+            return await toolcache.extractTar(path);
+        case "zstd":
+            // By specifying only the "x" flag, we ask tar to autodetect the
+            // compression method.
+            return await toolcache.extractTar(path, undefined, "x");
     }
-    return {
-        compressionMethod: "zstd",
-        // By specifying only the "x" flag, we ask tar to autodetect the compression
-        // method.
-        outputPath: await toolcache.extractTar(path, undefined, "x"),
-    };
+}
+function inferCompressionMethod(path) {
+    if (path.endsWith(".tar.gz")) {
+        return "gzip";
+    }
+    return "zstd";
 }
 //# sourceMappingURL=tar.js.map