export/import document worker

example/nodejs-commonjs/document-worker-export-import/index.js

@@ -0,0 +1,102 @@
+const { Document } = require("flexsearch");
+const { promises: fs } = require("fs");
+
+// loading test data
+const data = require(__dirname + "/data.json");
+
+// you will need to keep the index configuration
+// they will not export, also every change to the
+// configuration requires a full re-index
+const config = {
+    worker: true,
+    document: {
+        id: "tconst",
+        store: true,
+        index: [{
+            field: "primaryTitle",
+            config: __dirname + "/config.primaryTitle.js"
+        },{
+            field: "originalTitle",
+            config: __dirname + "/config.originalTitle.js"
+        }],
+        tag: [{
+            field: "startYear"
+        },{
+            field: "genres"
+        }]
+    }
+};
+
+(async function(){
+
+    // create the document and await (!) for the instance response
+    let document = await new Document(config);
+
+    // add test data
+    for(let i = 0; i < data.length; i++){
+        await document.add(data[i]);
+    }
+
+    // perform a query
+    let result = await document.search({
+        query: "karmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log(result);
+
+    // -----------------------
+    // EXPORT
+    // -----------------------
+
+    // create folders for the export
+    // it should be empty before export
+    await fs.mkdir("./export/").catch(e => {});
+
+    await document.export(async function(key, data){
+        await fs.writeFile("./export/" + key, data, "utf8");
+    });
+
+    // -----------------------
+    // IMPORT
+    // -----------------------
+
+    // create the same type of index you have used by .export()
+    // along with the same configuration
+    document = await new Document(config);
+
+    // load them in parallel
+    const files = await fs.readdir("./export/");
+    await Promise.all(files.map(async file => {
+        const data = await fs.readFile("./export/" + file, "utf8");
+        await document.import(file, data);
+    }));
+
+    // perform a query
+    result = await document.search({
+        query: "karmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log("-------------------------------------");
+    console.log(result);
+
+}());