consolidate literal gen

apps/sim/app/api/function/execute/route.ts

@@ -8,6 +8,7 @@ import { executeInIsolatedVM } from '@/lib/execution/isolated-vm'
 import { CodeLanguage, DEFAULT_CODE_LANGUAGE, isValidCodeLanguage } from '@/lib/execution/languages'
 import { escapeRegExp, normalizeName, REFERENCE } from '@/executor/constants'
 import { type OutputSchema, resolveBlockReference } from '@/executor/utils/block-reference'
+import { formatLiteralForCode } from '@/executor/utils/code-formatting'
 import {
   createEnvVarPattern,
   createWorkflowVariablePattern,
@@ -387,7 +388,12 @@ function resolveWorkflowVariables(
       if (type === 'number') {
         variableValue = Number(variableValue)
       } else if (type === 'boolean') {
-        variableValue = variableValue === 'true' || variableValue === true
+        if (typeof variableValue === 'boolean') {
+          // Already a boolean, keep as-is
+        } else {
+          const normalized = String(variableValue).toLowerCase().trim()
+          variableValue = normalized === 'true'
+        }
       } else if (type === 'json' && typeof variableValue === 'string') {
         try {
           variableValue = JSON.parse(variableValue)
@@ -687,11 +693,7 @@ export async function POST(req: NextRequest) {
         prologue += `const environmentVariables = JSON.parse(${JSON.stringify(JSON.stringify(envVars))});\n`
         prologueLineCount++
         for (const [k, v] of Object.entries(contextVariables)) {
-          if (v === undefined) {
+          prologue += `const ${k} = ${formatLiteralForCode(v, 'javascript')};\n`
-            prologue += `const ${k} = undefined;\n`
-          } else {
-            prologue += `const ${k} = JSON.parse(${JSON.stringify(JSON.stringify(v))});\n`
-          }
           prologueLineCount++
         }
 
@@ -762,11 +764,7 @@ export async function POST(req: NextRequest) {
       prologue += `environmentVariables = json.loads(${JSON.stringify(JSON.stringify(envVars))})\n`
       prologueLineCount++
       for (const [k, v] of Object.entries(contextVariables)) {
-        if (v === undefined) {
+        prologue += `${k} = ${formatLiteralForCode(v, 'python')}\n`
-          prologue += `${k} = None\n`
-        } else {
-          prologue += `${k} = json.loads(${JSON.stringify(JSON.stringify(v))})\n`
-        }
         prologueLineCount++
       }
       const wrapped = [

apps/sim/executor/utils/code-formatting.ts

@@ -0,0 +1,48 @@
+/**
+ * Formats a JavaScript/TypeScript value as a code literal for the target language.
+ * Handles special cases like null, undefined, booleans, and Python-specific number representations.
+ *
+ * @param value - The value to format
+ * @param language - Target language ('javascript' or 'python')
+ * @returns A string literal representation valid in the target language
+ *
+ * @example
+ * formatLiteralForCode(null, 'python') // => 'None'
+ * formatLiteralForCode(true, 'python') // => 'True'
+ * formatLiteralForCode(NaN, 'python')  // => "float('nan')"
+ * formatLiteralForCode("hello", 'javascript') // => '"hello"'
+ * formatLiteralForCode({a: 1}, 'python') // => "json.loads('{\"a\":1}')"
+ */
+export function formatLiteralForCode(value: unknown, language: 'javascript' | 'python'): string {
+  const isPython = language === 'python'
+
+  if (value === undefined) {
+    return isPython ? 'None' : 'undefined'
+  }
+  if (value === null) {
+    return isPython ? 'None' : 'null'
+  }
+  if (typeof value === 'boolean') {
+    return isPython ? (value ? 'True' : 'False') : String(value)
+  }
+  if (typeof value === 'number') {
+    if (Number.isNaN(value)) {
+      return isPython ? "float('nan')" : 'NaN'
+    }
+    if (value === Number.POSITIVE_INFINITY) {
+      return isPython ? "float('inf')" : 'Infinity'
+    }
+    if (value === Number.NEGATIVE_INFINITY) {
+      return isPython ? "float('-inf')" : '-Infinity'
+    }
+    return String(value)
+  }
+  if (typeof value === 'string') {
+    return JSON.stringify(value)
+  }
+  // Objects and arrays - Python needs json.loads() because JSON true/false/null aren't valid Python
+  if (isPython) {
+    return `json.loads(${JSON.stringify(JSON.stringify(value))})`
+  }
+  return JSON.stringify(value)
+}

apps/sim/executor/variables/resolver.ts

@@ -157,7 +157,14 @@ export class VariableResolver {
 
     let replacementError: Error | null = null
 
-    // Use generic utility for smart variable reference replacement
+    const blockType = block?.metadata?.id
+    const language =
+      blockType === BlockType.FUNCTION
+        ? ((block?.config?.params as Record<string, unknown> | undefined)?.language as
+            | string
+            | undefined)
+        : undefined
+
     let result = replaceValidReferences(template, (match) => {
       if (replacementError) return match
 
@@ -167,14 +174,7 @@ export class VariableResolver {
           return match
         }
 
-        const blockType = block?.metadata?.id
+        return this.blockResolver.formatValueForBlock(resolved, blockType, language)
-        const isInTemplateLiteral =
-          blockType === BlockType.FUNCTION &&
-          template.includes('${') &&
-          template.includes('}') &&
-          template.includes('`')
-
-        return this.blockResolver.formatValueForBlock(resolved, blockType, isInTemplateLiteral)
       } catch (error) {
         replacementError = error instanceof Error ? error : new Error(String(error))
         return match

apps/sim/executor/variables/resolvers/block.test.ts

@@ -257,15 +257,9 @@ describe('BlockResolver', () => {
       expect(result).toBe('"hello"')
     })
 
-    it.concurrent('should format string for function block in template literal', () => {
+    it.concurrent('should format object for function block', () => {
       const resolver = new BlockResolver(createTestWorkflow())
-      const result = resolver.formatValueForBlock('hello', 'function', true)
+      const result = resolver.formatValueForBlock({ a: 1 }, 'function')
-      expect(result).toBe('hello')
-    })
-
-    it.concurrent('should format object for function block in template literal', () => {
-      const resolver = new BlockResolver(createTestWorkflow())
-      const result = resolver.formatValueForBlock({ a: 1 }, 'function', true)
       expect(result).toBe('{"a":1}')
     })
 

apps/sim/executor/variables/resolvers/block.ts

@@ -10,6 +10,7 @@ import {
   type OutputSchema,
   resolveBlockReference,
 } from '@/executor/utils/block-reference'
+import { formatLiteralForCode } from '@/executor/utils/code-formatting'
 import {
   navigatePath,
   type ResolutionContext,
@@ -159,17 +160,13 @@ export class BlockResolver implements Resolver {
     return this.nameToBlockId.get(normalizeName(name))
   }
 
-  public formatValueForBlock(
+  public formatValueForBlock(value: any, blockType: string | undefined, language?: string): string {
-    value: any,
-    blockType: string | undefined,
-    isInTemplateLiteral = false
-  ): string {
     if (blockType === 'condition') {
       return this.stringifyForCondition(value)
     }
 
     if (blockType === 'function') {
-      return this.formatValueForCodeContext(value, isInTemplateLiteral)
+      return this.formatValueForCodeContext(value, language)
     }
 
     if (blockType === 'response') {
@@ -210,29 +207,7 @@ export class BlockResolver implements Resolver {
     return String(value)
   }
 
-  private formatValueForCodeContext(value: any, isInTemplateLiteral: boolean): string {
+  private formatValueForCodeContext(value: any, language?: string): string {
-    if (isInTemplateLiteral) {
+    return formatLiteralForCode(value, language === 'python' ? 'python' : 'javascript')
-      if (typeof value === 'string') {
-        return value
-      }
-      if (typeof value === 'object' && value !== null) {
-        return JSON.stringify(value)
-      }
-      return String(value)
-    }
-
-    if (typeof value === 'string') {
-      return JSON.stringify(value)
-    }
-    if (typeof value === 'object' && value !== null) {
-      return JSON.stringify(value)
-    }
-    if (value === undefined) {
-      return 'undefined'
-    }
-    if (value === null) {
-      return 'null'
-    }
-    return String(value)
   }
 }

apps/sim/executor/variables/resolvers/reference.ts

@@ -30,7 +30,10 @@ export function navigatePath(obj: any, path: string[]): any {
     const arrayMatch = part.match(/^([^[]+)(\[.+)$/)
     if (arrayMatch) {
       const [, prop, bracketsPart] = arrayMatch
-      current = current[prop]
+      current =
+        typeof current === 'object' && current !== null
+          ? (current as Record<string, unknown>)[prop]
+          : undefined
       if (current === undefined || current === null) {
         return undefined
       }
@@ -49,7 +52,10 @@ export function navigatePath(obj: any, path: string[]): any {
       const index = Number.parseInt(part, 10)
       current = Array.isArray(current) ? current[index] : undefined
     } else {
-      current = current[part]
+      current =
+        typeof current === 'object' && current !== null
+          ? (current as Record<string, unknown>)[part]
+          : undefined
     }
   }
   return current

apps/sim/lib/execution/isolated-vm-worker.cjs

@@ -132,6 +132,8 @@ async function executeCode(request) {
     for (const [key, value] of Object.entries(contextVariables)) {
       if (value === undefined) {
         await jail.set(key, undefined)
+      } else if (value === null) {
+        await jail.set(key, null)
       } else {
         await jail.set(key, new ivm.ExternalCopy(value).copyInto())
       }

apps/sim/lib/workflows/variables/variable-manager.test.ts

@@ -26,7 +26,7 @@ describe('VariableManager', () => {
     it.concurrent('should handle boolean type variables', () => {
       expect(VariableManager.parseInputForStorage('true', 'boolean')).toBe(true)
       expect(VariableManager.parseInputForStorage('false', 'boolean')).toBe(false)
-      expect(VariableManager.parseInputForStorage('1', 'boolean')).toBe(true)
+      expect(VariableManager.parseInputForStorage('1', 'boolean')).toBe(false)
       expect(VariableManager.parseInputForStorage('0', 'boolean')).toBe(false)
       expect(VariableManager.parseInputForStorage('"true"', 'boolean')).toBe(true)
       expect(VariableManager.parseInputForStorage("'false'", 'boolean')).toBe(false)
@@ -128,7 +128,7 @@ describe('VariableManager', () => {
       expect(VariableManager.resolveForExecution(false, 'boolean')).toBe(false)
       expect(VariableManager.resolveForExecution('true', 'boolean')).toBe(true)
       expect(VariableManager.resolveForExecution('false', 'boolean')).toBe(false)
-      expect(VariableManager.resolveForExecution('1', 'boolean')).toBe(true)
+      expect(VariableManager.resolveForExecution('1', 'boolean')).toBe(false)
       expect(VariableManager.resolveForExecution('0', 'boolean')).toBe(false)
     })
 

apps/sim/lib/workflows/variables/variable-manager.ts

@@ -61,7 +61,7 @@ export class VariableManager {
         // Special case for 'anything else' in the test
         if (unquoted === 'anything else') return true
         const normalized = String(unquoted).toLowerCase().trim()
-        return normalized === 'true' || normalized === '1'
+        return normalized === 'true'
       }
 
       case 'object':