Publish node-addon-api wrapper for sherpa-onnx as npm packages (#829)

scripts/node-addon-api/lib/addon.js

@@ -0,0 +1,50 @@
+const os = require('os');
+const platform_arch = `${os.platform()}-${os.arch()}`;
+const possible_paths = [
+  '../build/Release/sherpa-onnx.node',
+  '../build/Debug/sherpa-onnx.node',
+  `./node_modules/sherpa-onnx-${platform_arch}/sherpa-onnx.node`,
+  `../sherpa-onnx-${platform_arch}/sherpa-onnx.node`,
+];
+
+let found = false;
+for (const p of possible_paths) {
+  try {
+    module.exports = require(p);
+    found = true;
+    break;
+  } catch (error) {
+    // do nothing; try the next option
+    ;
+  }
+}
+
+if (!found) {
+  let msg =
+      `Could not find sherpa-onnx. Tried\n\n  ${possible_paths.join('\n  ')}\n`
+  if (os.platform() == 'darwin' && process.env.DYLD_LIBRARY_PATH &&
+      !process.env.DYLD_LIBRARY_PATH.includes(
+          `node_modules/sherpa-onnx-${platform_arch}`)) {
+    msg +=
+        'Please remeber to set the following environment variable and try again:\n';
+
+    msg += `export DYLD_LIBRARY_PATH=${
+        process.env.PWD}/node_modules/sherpa-onnx-${platform_arch}`;
+
+    msg += ':$DYLD_LIBRARY_PATH\n';
+  }
+
+  if (os.platform() == 'linux' && process.env.LD_LIBRARY_PATH &&
+      !process.env.LD_LIBRARY_PATH.includes(
+          `node_modules/sherpa-onnx-${platform_arch}`)) {
+    msg +=
+        'Please remeber to set the following environment variable and try again:\n';
+
+    msg += `export LD_LIBRARY_PATH=${
+        process.env.PWD}/node_modules/sherpa-onnx-${platform_arch}`;
+
+    msg += ':$LD_LIBRARY_PATH\n';
+  }
+
+  throw new Error(msg)
+}