add duckdb-ui-client & other ts pkgs (#10)

* add duckdb-ui-client & other ts pkgs

* workflow fixes

* fix working dir

* no sparse checkout; specify package.json path

* path to pnpm-lock.yaml

* add check & build test

* workflow step descriptions

* use comments & names

* one more naming tweak

ts/pkgs/duckdb-data-values/test/DuckDBArrayValue.test.ts

@@ -0,0 +1,49 @@
+import { expect, suite, test } from 'vitest';
+import { DuckDBArrayValue } from '../src/DuckDBArrayValue';
+import { DuckDBMapValue } from '../src/DuckDBMapValue';
+
+suite('DuckDBArrayValue', () => {
+  test('should render an empty array to the correct string', () => {
+    expect(new DuckDBArrayValue([]).toString()).toStrictEqual('[]');
+  });
+  test('should render a single element array to the correct string', () => {
+    expect(new DuckDBArrayValue([123]).toString()).toStrictEqual('[123]');
+  });
+  test('should render a multi-element array to the correct string', () => {
+    expect(
+      new DuckDBArrayValue(['abc', null, true, '']).toString(),
+    ).toStrictEqual(`['abc', NULL, true, '']`);
+  });
+  test('should render an array with nested arrays to the correct string', () => {
+    expect(
+      new DuckDBArrayValue([
+        new DuckDBArrayValue([]),
+        null,
+        new DuckDBArrayValue([123, null, 'xyz']),
+      ]).toString(),
+    ).toStrictEqual(`[[], NULL, [123, NULL, 'xyz']]`);
+  });
+  test('toJson array with basic values', () => {
+    expect(new DuckDBArrayValue([123, 'abc', null]).toJson()).toStrictEqual([
+      123,
+      'abc',
+      null,
+    ]);
+  });
+  test('toJson array with complex values', () => {
+    expect(
+      new DuckDBArrayValue([
+        new DuckDBMapValue([
+          { key: 'foo', value: 123 },
+          { key: 'bar', value: 'abc' },
+        ]),
+        new DuckDBArrayValue([123, null, 'xyz']),
+        null,
+      ]).toJson(),
+    ).toStrictEqual([
+      { "'foo'": 123, "'bar'": 'abc' },
+      [123, null, 'xyz'],
+      null,
+    ]);
+  });
+});