feature(typescript): add TypeScript type definitions (#28)

Co-authored-by: Malcolm Nihlén <[email protected]>

Author: igoro00

lib/index.d.ts

@@ -0,0 +1,17 @@
+declare module 'sql-highlight' {
+  export interface HighlightOptions {
+    html?: boolean;
+    classPrefix?: string;
+    colors?: {
+      keyword: string;
+      function: string;
+      number: string;
+      string: string;
+      special: string;
+      bracket: string;
+      clear: string;
+    };
+  }
+  
+  export function highlight(sqlString: string, options?: HighlightOptions): string;
+}

package.json

@@ -3,6 +3,7 @@
   "version": "4.0.1",
   "description": "A simple and lightweight syntax highlighting library for SQL",
   "main": "lib/index.js",
+  "types": "./lib/index.d.ts",
   "repository": {
     "type": "git",
     "url": "https://github.com/scriptcoded/sql-highlight.git"