transforming original libheif files so that they can run on older ver…

…sions of node

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16, 18, 20]
+        node-version: [12, 14, 16, 18, 20]
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}

scripts/install.js

@@ -43,7 +43,23 @@ const autoReadStream = async stream => {
     if (entry.header.type === 'file' && ['libheif', 'libheif-wasm'].includes(basedir)) {
       const outfile = path.resolve(root, entry.header.name);
       console.log(`  writing "${outfile}"`);
-      await fs.outputFile(outfile, await autoReadStream(entry));
+
+      let file = await autoReadStream(entry);
+
+      if (path.extname(outfile) === '.js') {
+        // libheif started using optional chaining, which is not
+        // supported in older versions of node, but we'd like to
+        // support them here, so transform to a target from before
+        // https://esbuild.github.io/content-types/#javascript
+        const result = await esbuild.transform(file, {
+          target: 'es2019',
+          minify: true
+        });
+
+        file = result.code;
+      }
+
+      await fs.outputFile(outfile, file);
     } else {
       await autoReadStream(entry);
     }