fix: end the FileStreamWriter for the installer file

.eslintrc.json

@@ -47,6 +47,7 @@
         "@typescript-eslint/no-array-constructor": "error",
         "@typescript-eslint/no-empty-interface": "error",
         "@typescript-eslint/no-explicit-any": "error",
+        "@typescript-eslint/no-floating-promises": "error",
         "@typescript-eslint/no-extraneous-class": "error",
         "@typescript-eslint/no-for-in-array": "error",
         "@typescript-eslint/no-inferrable-types": "error",
@@ -71,4 +72,4 @@
         "node": true,
         "es6": true
     }
-}
+}

src/main.ts

@@ -1,11 +1,13 @@
 import * as actions_core from "@actions/core";
 import * as github from "@actions/github";
-import { mkdtemp, chmod, access, writeFile } from "node:fs/promises";
+import { mkdtemp, chmod, access, writeFile, open } from "node:fs/promises";
 import { spawn } from "node:child_process";
 import { randomUUID } from "node:crypto";
 import { join } from "node:path";
 import { tmpdir } from "node:os";
 import stream from "node:stream";
+import stream_web from "node:stream/web";
+import { finished } from "node:stream/promises";
 import fs from "node:fs";
 import stringArgv from "string-argv";
 
@@ -429,14 +431,20 @@ class NixInstallerAction {
       const tempdir = await mkdtemp(join(tmpdir(), "nix-installer-"));
       const tempfile = join(tempdir, `nix-installer-${this.platform}`);
 
-      if (!response.ok) {
-        throw new Error(`unexpected response ${response.statusText}`);
-      }
-
       if (response.body !== null) {
-        const fileStream = fs.createWriteStream(tempfile);
-        const fileStreamWeb = stream.Writable.toWeb(fileStream);
-        await response.body.pipeTo(fileStreamWeb);
+        const handle = await open(
+          tempfile,
+          fs.constants.O_CREAT |
+            fs.constants.O_TRUNC |
+            fs.constants.O_WRONLY |
+            fs.constants.O_DSYNC,
+        );
+        const fileStream = handle.createWriteStream();
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        const bodyCast = response.body as stream_web.ReadableStream<any>;
+        const bodyReader = stream.Readable.fromWeb(bodyCast);
+        await finished(bodyReader.pipe(fileStream));
+        fileStream.close();
 
         actions_core.info(`Downloaded \`nix-installer\` to \`${tempfile}\``);
       } else {
@@ -692,11 +700,11 @@ async function main(): Promise<void> {
       actions_core.saveState("isPost", "true");
       await installer.install();
     } else {
-      installer.report_overall();
+      await installer.report_overall();
     }
   } catch (error) {
     if (error instanceof Error) actions_core.setFailed(error);
   }
 }
 
-main();
+await main();

tsconfig.json

@@ -1,7 +1,8 @@
 {
     "compilerOptions": {
-        "target": "es6", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-        "module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+        "target": "es2017", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+        "module": "esnext",
+        "moduleResolution": "node",
         "outDir": "./lib", /* Redirect output structure to the directory. */
         "rootDir": "./src", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
         "strict": true, /* Enable all strict type-checking options. */
@@ -12,4 +13,4 @@
         "node_modules",
         "**/*.test.ts"
     ]
-}
+}