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/DuckDBTimestampTZValue.test.ts

@@ -0,0 +1,38 @@
+import { expect, suite, test } from 'vitest';
+import { DuckDBTimestampTZValue } from '../src/DuckDBTimestampTZValue';
+
+suite('DuckDBTimestampTZValue', () => {
+  test('should render a timestamp tz value with no timezone offset to the correct string', () => {
+    expect(
+      new DuckDBTimestampTZValue(1612325106007800n).toDuckDBString(),
+    ).toStrictEqual('2021-02-03 04:05:06.0078+00'); // defaults to UTC
+  });
+  test('should render a timestamp tz value with a zero timezone offset to the correct string', () => {
+    expect(
+      new DuckDBTimestampTZValue(1612325106007800n).toDuckDBString({
+        timezoneOffsetInMinutes: 0,
+      }),
+    ).toStrictEqual('2021-02-03 04:05:06.0078+00');
+  });
+  test('should render a timestamp tz value with a positive timezone offset to the correct string', () => {
+    expect(
+      new DuckDBTimestampTZValue(1612325106007800n).toDuckDBString({
+        timezoneOffsetInMinutes: 300,
+      }),
+    ).toStrictEqual('2021-02-03 09:05:06.0078+05');
+  });
+  test('should render a timestamp tz value with a negative timezone offset to the correct string', () => {
+    expect(
+      new DuckDBTimestampTZValue(1612325106007800n).toDuckDBString({
+        timezoneOffsetInMinutes: -300,
+      }),
+    ).toStrictEqual('2021-02-02 23:05:06.0078-05');
+  });
+  test('should render a timestamp tz value with a timezone offset containing minutes to the correct string', () => {
+    expect(
+      new DuckDBTimestampTZValue(1612325106007800n).toDuckDBString({
+        timezoneOffsetInMinutes: 330,
+      }),
+    ).toStrictEqual('2021-02-03 09:35:06.0078+05:30');
+  });
+});