.

bin/build_ghostty_wasm.mjs

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2026 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { spawnSync } from 'child_process';
+import { copyFileSync, mkdirSync, renameSync } from 'fs';
+import path from 'path';
+import process from 'process';
+import { fileURLToPath } from 'url';
+
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+const ghosttyDir = path.join(repoRoot, 'vendor', 'ghostty');
+const wasmOutDir = path.join(repoRoot, 'vendor', 'ghostty-wasm');
+const wasmBinDir = path.join(wasmOutDir, 'bin');
+const wasmFile = path.join(wasmOutDir, 'ghostty-vt.wasm');
+const wasmBinFile = path.join(wasmBinDir, 'ghostty-vt.wasm');
+
+mkdirSync(wasmOutDir, { recursive: true });
+
+const result = spawnSync('zig', [
+  'build',
+  'lib-vt',
+  '-Dtarget=wasm32-freestanding',
+  '-Doptimize=ReleaseSmall',
+  '-p',
+  path.relative(ghosttyDir, wasmOutDir)
+], {
+  cwd: ghosttyDir,
+  stdio: 'inherit',
+  shell: true
+});
+
+if (result.status !== 0) {
+  process.exit(result.status ?? 1);
+}
+
+try {
+  renameSync(wasmBinFile, wasmFile);
+} catch {
+  copyFileSync(wasmBinFile, wasmFile);
+}

bin/test_unit.js

@@ -6,6 +6,9 @@
 const cp = require('child_process');
 const path = require('path');
 
+globalThis.require = require;
+globalThis.XTERM_GHOSTTY_WASM_URL = path.resolve(__dirname, '../vendor/ghostty-wasm/ghostty-vt.wasm');
+
 const COVERAGE_LINES_THRESHOLD = 40;
 
 // Add `out` to the NODE_PATH so absolute paths can be resolved.