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-ui-client/src/data-chunk/classes/DuckDBDataChunk.ts

@@ -0,0 +1,42 @@
+import { DuckDBData } from '@duckdb/data-reader';
+import { DuckDBType } from '@duckdb/data-types';
+import { DuckDBValue } from '@duckdb/data-values';
+import { duckDBTypeFromTypeIdAndInfo } from '../../conversion/functions/duckDBTypeFromTypeIdAndInfo.js';
+import { duckDBValueFromVector } from '../../conversion/functions/duckDBValueFromVector.js';
+import { ColumnNamesAndTypes } from '../../serialization/types/ColumnNamesAndTypes.js';
+import { DataChunk } from '../../serialization/types/DataChunk.js';
+
+export class DuckDBDataChunk extends DuckDBData {
+  constructor(
+    private columnNamesAndTypes: ColumnNamesAndTypes,
+    private chunk: DataChunk,
+  ) {
+    super();
+  }
+
+  get columnCount() {
+    return this.columnNamesAndTypes.names.length;
+  }
+
+  get rowCount() {
+    return this.chunk.rowCount;
+  }
+
+  columnName(columnIndex: number): string {
+    return this.columnNamesAndTypes.names[columnIndex];
+  }
+
+  columnType(columnIndex: number): DuckDBType {
+    return duckDBTypeFromTypeIdAndInfo(
+      this.columnNamesAndTypes.types[columnIndex],
+    );
+  }
+
+  value(columnIndex: number, rowIndex: number): DuckDBValue {
+    return duckDBValueFromVector(
+      this.columnNamesAndTypes.types[columnIndex],
+      this.chunk.vectors[columnIndex],
+      rowIndex,
+    );
+  }
+}