fix: remove lodash and define isString locally (#442)

* fix: remove lodash and define isString locally

* fix: remove @types/lodash

Author: edwin-speer

package.json

@@ -53,7 +53,6 @@
     "@stylistic/eslint-plugin": "^4.4.1",
     "@terrestris/eslint-config-typescript": "^9.0.0",
     "@types/jest": "^29.5.14",
-    "@types/lodash": "^4.17.17",
     "@typescript-eslint/eslint-plugin": "^8.33.1",
     "@vitejs/plugin-react": "^4.5.1",
     "@vitest/coverage-v8": "^3.2.1",

src/CqlParser.ts

@@ -4,12 +4,6 @@ import {
   isOperator
 } from 'geostyler-style';
 
-import {
-  isString as _isString,
-  isNumber as _isNumber,
-  isNaN as _isNaN
-} from 'lodash';
-
 import './cql-parser.cjs';
 
 import { CombinationOperator, Expression, Filter, Operator, PropertyType } from 'geostyler-style/dist/style';
@@ -34,6 +28,8 @@ type PrecedenceMap = {
   [name: string]: 1 | 2 | 3;
 };
 
+const isString = (value: any) => typeof value === 'string';
+
 export class CqlParser {
 
   tokens: PatternName[] = [
@@ -158,7 +154,7 @@ export class CqlParser {
         case '<=':
         case '>':
         case '>=':
-          const valueIsString = _isString(f[2]);
+          const valueIsString = isString(f[2]);
           let value = f[2];
           if (valueIsString) {
             value = `'${value}'`;