refactor(openai-codex): align service tier types

Author: WebMad

packages/types/src/model.ts

@@ -73,10 +73,14 @@ export type ServiceTier = z.infer<typeof serviceTierSchema>
 /**
  * Service tiers for Codex requests authenticated through a ChatGPT subscription.
  */
-export enum OpenAiCodexServiceTier {
-	Default = "default",
-	Priority = "priority",
-}
+export const OpenAiCodexServiceTier = {
+	Default: "default",
+	Priority: "priority",
+} as const
+
+export const openAiCodexServiceTiers = [OpenAiCodexServiceTier.Default, OpenAiCodexServiceTier.Priority] as const
+export const openAiCodexServiceTierSchema = z.enum(openAiCodexServiceTiers)
+export type OpenAiCodexServiceTier = z.infer<typeof openAiCodexServiceTierSchema>
 
 /**
  * ModelParameter

packages/types/src/provider-settings.ts

@@ -2,7 +2,7 @@ import { z } from "zod"
 
 import {
 	modelInfoSchema,
-	OpenAiCodexServiceTier,
+	openAiCodexServiceTierSchema,
 	reasoningEffortSettingSchema,
 	verbosityLevelsSchema,
 	serviceTierSchema,
@@ -287,9 +287,7 @@ const geminiCliSchema = apiModelIdProviderModelSchema.extend({
 
 const openAiCodexSchema = apiModelIdProviderModelSchema.extend({
 	// Codex "Fast" mode maps to the Responses API priority service tier.
-	[OPEN_AI_CODEX_SERVICE_TIER_KEY]: z
-		.enum([OpenAiCodexServiceTier.Default, OpenAiCodexServiceTier.Priority])
-		.optional(),
+	[OPEN_AI_CODEX_SERVICE_TIER_KEY]: openAiCodexServiceTierSchema.optional(),
 })
 
 const openAiNativeSchema = apiModelIdProviderModelSchema.extend({

src/api/providers/__tests__/openai-codex.spec.ts

@@ -261,7 +261,7 @@ describe("OpenAiCodexHandler.completePrompt service tier", () => {
 		vitest.unstubAllGlobals()
 	})
 
-	it.each<[string, OpenAiCodexServiceTier.Priority | undefined, OpenAiCodexServiceTier.Priority | undefined]>([
+	it.each<[string, OpenAiCodexServiceTier | undefined, typeof OpenAiCodexServiceTier.Priority | undefined]>([
 		["Fast", OpenAiCodexServiceTier.Priority, OpenAiCodexServiceTier.Priority],
 		["Standard", undefined, undefined],
 	])("uses the %s preference in non-streaming requests", async (_mode, configuredTier, expectedTier) => {

src/api/providers/openai-codex.ts

@@ -32,7 +32,7 @@ import { t } from "../../i18n"
 
 export type OpenAiCodexModel = ReturnType<OpenAiCodexHandler["getModel"]>
 
-type OpenAiCodexRequestServiceTier = OpenAiCodexServiceTier.Priority
+type OpenAiCodexRequestServiceTier = typeof OpenAiCodexServiceTier.Priority
 
 /**
  * OpenAI Codex base URL for API requests