Prevent use of /tmp for Node.js on Windows (#84)

Author: kleisauke

CHANGELOG.md

@@ -8,6 +8,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 Uses libvips v8.16.0, compiled with Emscripten v3.1.71.
 
+### Fixed
+
+- Prevent use of the `/tmp` directory for Node.js on Windows.
+  [#84](https://github.com/kleisauke/wasm-vips/issues/84)
+
 ## [v0.0.11] - 2024-10-31
 
 Uses libvips v8.16.0, compiled with Emscripten v3.1.70.

src/vips-library.js

@@ -10,17 +10,23 @@ var LibraryVips = {
   $VIPS__postset: 'VIPS.init();',
   $VIPS: {
     init() {
-#if ENVIRONMENT_MAY_BE_WEB
       addOnPreRun(() => {
+#if ENVIRONMENT_MAY_BE_WEB
         // Enforce a fixed thread pool by default on web
         ENV['VIPS_MAX_THREADS'] = {{{ PTHREAD_POOL_SIZE }}};
 
         // We cannot safely spawn dedicated workers on the web. Therefore, to avoid any potential deadlocks, we reduce
         // the concurrency to 1. For more details, see:
         // https://emscripten.org/docs/porting/pthreads.html#blocking-on-the-main-browser-thread
         ENV['VIPS_CONCURRENCY'] = 1;
-      });
 #endif
+#if ENVIRONMENT_MAY_BE_NODE
+        // libvips stores temporary files by default in `/tmp`;
+        // set the TMPDIR env variable to override this directory
+        ENV['TMPDIR'] = require('os').tmpdir();
+#endif
+      });
+
       addOnInit(() => {
         // SourceCustom.onRead marshaller 
         const sourceCustom = Object.getOwnPropertyDescriptor(Module['SourceCustom'].prototype, 'onRead');

test/bench/perf.js

@@ -3,7 +3,6 @@
 import Benchmark from 'benchmark';
 
 import Vips from '../../lib/vips-node.mjs';
-import { tmpdir } from 'node:os';
 import { inputJpg, inputPng, inputWebP, getPath } from './images.js';
 
 const width = 720;
@@ -19,12 +18,7 @@ const webpOut = getPath('output.webp');
 
 const vips = await Vips({
   // Disable dynamic modules
-  dynamicLibraries: [],
-  preRun: (module) => {
-    // libvips stores temporary files by default in `/tmp`;
-    // set the TMPDIR env variable to override this directory
-    module.ENV.TMPDIR = tmpdir();
-  }
+  dynamicLibraries: []
 });
 
 // Disable libvips cache to ensure tests are as fair as they can be

test/unit/node-helper.js

@@ -2,7 +2,6 @@
 
 import Vips from '../../lib/vips-node.mjs';
 
-import { tmpdir } from 'node:os';
 import { expect } from 'chai';
 
 globalThis.expect = expect;
@@ -26,10 +25,6 @@ export async function mochaGlobalSetup () {
 
       // Hide warning messages
       module.ENV.VIPS_WARNING = 0;
-
-      // libvips stores temporary files by default in `/tmp`;
-      // set the TMPDIR env variable to override this directory
-      module.ENV.TMPDIR = tmpdir();
     }
   };
   globalThis.vips = await Vips(options);