Remove built-in custom functions

package.json

@@ -1,7 +1,7 @@
 {
   "name": "jempl",
   "version": "1.0.0",
-  "description": "A JSON templating engine with conditionals, loops, and custom functions",
+  "description": "A JSON templating engine with conditionals, loops, and user-defined custom functions",
   "main": "src/index.js",
   "types": "types/index.d.ts",
   "type": "module",

spec/render/renderErrors.spec.yaml

@@ -12,7 +12,7 @@ in:
   - "${unknownFunc()}"
   - {}
   - functions: {}
-throws: "Render Error: Unknown function 'unknownFunc' (now)"
+throws: "Render Error: Unknown function 'unknownFunc' (no custom functions provided)"
 
 ---
 case: unknown function with available functions  

src/parse/index.js

@@ -20,10 +20,13 @@ import { parseValue } from "./utils.js";
  * });
  *
  * @example
- * // Template with custom function
+ * // Template with custom functions
  * const ast = parse(
  *   { timestamp: "${formatDate(now())}" },
- *   { functions: { formatDate: (date) => new Date(date).toISOString() } }
+ *   { functions: {
+ *     formatDate: (date) => new Date(date).toISOString(),
+ *     now: () => Date.now()
+ *   }}
  * );
  */
 const parse = (template, options = {}) => {

src/parse/variables.js

@@ -282,7 +282,7 @@ export const parsePathReference = (expr) => {
 };
 
 /**
- * Parses a variable expression like ${name} or ${user.profile.name} or function calls like ${now()}
+ * Parses a variable expression like ${name} or ${user.profile.name} or function calls like ${customFunction()}
  * @param {string} expr - The expression without ${ and }
  * @param {Object} functions - Available functions for validation
  * @returns {Object} Variable or Function node

src/parseAndRender.js

@@ -1,6 +1,5 @@
 import parse from "./parse/index.js";
 import render from "./render.js";
-import * as defaultFunctions from "./functions.js";
 
 /**
  * Convenience function that parses a template and renders it with data in one step
@@ -47,21 +46,18 @@ import * as defaultFunctions from "./functions.js";
 const parseAndRender = (template, data, options = {}) => {
   const { functions = {}, partials = {} } = options;
 
-  // Merge default functions with custom functions
-  const allFunctions = { ...defaultFunctions, ...functions };
-
   // Parse the template into an AST
-  const ast = parse(template, { functions: allFunctions });
+  const ast = parse(template, { functions });
 
   // Parse all partials into ASTs
   const parsedPartials = {};
   for (const [name, partialTemplate] of Object.entries(partials)) {
-    parsedPartials[name] = parse(partialTemplate, { functions: allFunctions });
+    parsedPartials[name] = parse(partialTemplate, { functions });
   }
 
   // Render the AST with the data and partials
   return render(ast, data, {
-    functions: allFunctions,
+    functions,
     partials: parsedPartials,
   });
 };

src/render.js

@@ -30,7 +30,7 @@ import {
  *
  * @example
  * // Render with custom functions
- * const ast = parse({ timestamp: "${now()}" });
+ * const ast = parse({ timestamp: "${now()}" }, { functions: { now: () => Date.now() } });
  * const result = render(ast, {}, { now: () => Date.now() });
  * // result: { timestamp: 1234567890123 }
  */