fix: warn user when telefunction has no shield()

telefunc/node/server/runTelefunc.ts

@@ -12,6 +12,7 @@ import { executeTelefunction } from './runTelefunc/executeTelefunction'
 import { serializeTelefunctionResult } from './runTelefunc/serializeTelefunctionResult'
 import { handleError } from './runTelefunc/handleError'
 import { executeServerErrorListeners } from './runTelefunc/onTelefuncServerError'
+import { applyShield } from './runTelefunc/applyShield'
 
 type HttpResponse = {
   body: string
@@ -104,6 +105,8 @@ async function runTelefunc_(runContext: {
     objectAssign(runContext, { telefunction })
   }
 
+  applyShield(runContext)
+
   const { telefunctionReturn, telefunctionAborted, telefunctionHasErrored, telefunctionError } =
     await executeTelefunction(runContext)
   objectAssign(runContext, {

telefunc/node/server/runTelefunc/applyShield.ts

@@ -0,0 +1,22 @@
+export { applyShield }
+
+import { shield, shieldApply, shieldIsMissing, shieldToHumandReadable } from '../shield'
+import { assertWarning } from '../../utils'
+import type { Telefunction } from '../types'
+
+async function applyShield(runContext: {
+  telefunction: Telefunction
+  telefunctionFilePath: string
+  telefunctionExportName: string
+  telefunctionArgs: unknown[]
+}) {
+  const { telefunction } = runContext
+  const hasShield = !shieldIsMissing(telefunction)
+  assertWarning(
+    hasShield || telefunction.length === 0,
+    `The telefunction ${runContext.telefunctionExportName} (${runContext.telefunctionFilePath}) accepts arguments yet is missing a \`shield()\`, see https://telefunc.com/shield`,
+  )
+  if (hasShield) {
+    shieldApply(telefunction, runContext.telefunctionArgs)
+  }
+}