JavaScript / Node.js library for LanceDB

- Core rust library
- ffi bridge that exposes rust functionality to javascript
- npm package that provides a TypeScript / JavaScript library
- limitations: it only supports reading for now

node/src/test/test.ts

@@ -0,0 +1,71 @@
+// Copyright 2023 Lance Developers.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { describe } from 'mocha'
+import { assert } from 'chai'
+
+import * as lancedb from '../index'
+
+describe('LanceDB client', function () {
+  describe('open a connection to lancedb', function () {
+    const con = lancedb.connect('.../../sample-lancedb')
+
+    it('should have a valid url', function () {
+      assert.equal(con.uri, '.../../sample-lancedb')
+    })
+
+    it('should return the existing table names', function () {
+      assert.deepEqual(con.tableNames(), ['my_table'])
+    })
+
+    describe('open a table from a connection', function () {
+      const tablePromise = con.openTable('my_table')
+
+      it('should have a valid name', async function () {
+        const table = await tablePromise
+        assert.equal(table.name, 'my_table')
+      })
+
+      class MyResult {
+        vector: Float32Array = new Float32Array(0)
+        price: number = 0
+        item: string = ''
+      }
+
+      it('execute a query', async function () {
+        const table = await tablePromise
+        const builder = table.search([0.1, 0.3])
+        const results = await builder.execute() as MyResult[]
+
+        assert.equal(results.length, 2)
+        assert.equal(results[0].item, 'foo')
+        assert.equal(results[0].price, 10)
+        assert.approximately(results[0].vector[0], 3.1, 0.1)
+        assert.approximately(results[0].vector[1], 4.1, 0.1)
+      })
+
+      it('execute a query and type cast the result', async function () {
+        const table = await tablePromise
+
+        const builder = table.search([0.1, 0.3])
+        const results = await builder.execute_cast<MyResult>()
+        assert.equal(results.length, 2)
+        assert.equal(results[0].item, 'foo')
+        assert.equal(results[0].price, 10)
+        assert.approximately(results[0].vector[0], 3.1, 0.1)
+        assert.approximately(results[0].vector[1], 4.1, 0.1)
+      })
+    })
+  })
+})