♻️ Export bot-engine code into its own package

packages/bot-engine/variables/prefillVariables.ts

@@ -0,0 +1,15 @@
+import { safeStringify } from '@typebot.io/lib/safeStringify'
+import { StartParams, Variable } from '@typebot.io/schemas'
+
+export const prefillVariables = (
+  variables: Variable[],
+  prefilledVariables: NonNullable<StartParams['prefilledVariables']>
+): Variable[] =>
+  variables.map((variable) => {
+    const prefilledVariable = prefilledVariables[variable.name]
+    if (!prefilledVariable) return variable
+    return {
+      ...variable,
+      value: safeStringify(prefilledVariable),
+    }
+  })