Start adding filters, migrate types to zod, update readme

src/app/duckdb.service.ts

@@ -1,21 +1,39 @@
 import { Injectable, OnInit } from '@angular/core';
 import * as duckdb from '@duckdb/duckdb-wasm';
-import { connect } from 'rxjs';
+import { z } from 'zod';
 
-export interface Column {
-  name: string;
-  type: string;
-}
+export const Column = z.object({
+  name: z.string(),
+  type: z.string(),
+});
 
-export interface SortColumn {
-  name: string;
-  sortType: 'asc' | 'desc';
-}
+const SortColumn = z.object({
+  name: z.string(),
+  sortType: z.enum(['asc', 'desc']),
+});
 
-export interface RowsResponse {
-  rows: any[];
-  totalRows: bigint;
-}
+const Filter = z.object({
+  value: z.string().array(),
+  operator: z.enum(['and', 'or']),
+  matchType: z.enum([
+    'startsWith',
+    'contains',
+    'notContains',
+    'endsWith',
+    'equals',
+    'notEquals',
+  ]),
+});
+
+const RowsResponse = z.object({
+  rows: z.any(),
+  totalRows: z.bigint(),
+});
+
+export type Column = z.infer<typeof Column>;
+export type SortColumn = z.infer<typeof SortColumn>;
+export type Filter = z.infer<typeof Filter>;
+export type RowsResponse = z.infer<typeof RowsResponse>;
 
 const sanitisedFileName = (file: File) =>
   file.name.toLowerCase().replaceAll("'", '').replaceAll(/\s*/g, '');
@@ -104,7 +122,7 @@ export class DuckdbService {
     numRows: number,
     columns: Column[],
     sorts: SortColumn[],
-    filters: unknown[],
+    filters: Filter[],
     aggregations: unknown[],
   ): Promise<RowsResponse> {
     const conn = await this.db.connect();