Add keyword spotting API for node-addon-api (#877)

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

@@ -0,0 +1,32 @@
+const addon = require('./addon.js');
+const streaming_asr = require('./streaming-asr.js');
+
+class KeywordSpotter {
+  constructor(config) {
+    this.handle = addon.createKeywordSpotter(config);
+    this.config = config
+  }
+
+  createStream() {
+    const handle = addon.createKeywordStream(this.handle);
+    return new streaming_asr.OnlineStream(handle);
+  }
+
+  isReady(stream) {
+    return addon.isKeywordStreamReady(this.handle, stream.handle);
+  }
+
+  decode(stream) {
+    addon.decodeKeywordStream(this.handle, stream.handle);
+  }
+
+  getResult(stream) {
+    const jsonStr = addon.getKeywordResultAsJson(this.handle, stream.handle);
+
+    return JSON.parse(jsonStr);
+  }
+}
+
+module.exports = {
+  KeywordSpotter,
+}

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

@@ -7,6 +7,7 @@ const slid = require('./spoken-language-identification.js');
 const sid = require('./speaker-identification.js');
 const at = require('./audio-tagg.js');
 const punct = require('./punctuation.js');
+const kws = require('./keyword-spotter.js');
 
 module.exports = {
   OnlineRecognizer: streaming_asr.OnlineRecognizer,
@@ -22,4 +23,5 @@ module.exports = {
   SpeakerEmbeddingManager: sid.SpeakerEmbeddingManager,
   AudioTagging: at.AudioTagging,
   Punctuation: punct.Punctuation,
+  KeywordSpotter: kws.KeywordSpotter,
 }