feat: make ajv-cmd optional

packages/validator/transpile.js

@@ -1,3 +1,4 @@
+/*
 import compileSchema from 'ajv-cmd/compile'
 import transpileFTL from 'ajv-cmd/ftl'
 
@@ -17,8 +18,8 @@ export const transpileSchema = (schema, ajvOptions) => {
 }
 
 export const transpileLocale = transpileFTL
+*/
 
-/*
 import Ajv from 'ajv/dist/2020.js'
 import ajvFormats from 'ajv-formats'
 import ajvFormatsDraft2019 from 'ajv-formats-draft2019'
@@ -56,4 +57,17 @@ const compileSchema = (schema, options = {}) => {
 }
 // *** End `ajv-cmd/compile` *** //
 
-*/
+const ajvDefaults = {
+  strict: true,
+  coerceTypes: 'array', // important for query string params
+  allErrors: true,
+  useDefaults: 'empty',
+  messages: true // needs to be true to allow multi-locale errorMessage to work
+}
+
+// This is pulled out due to it's performance cost (50-100ms on cold start)
+// Precompile your schema during a build step is recommended.
+export const transpileSchema = (schema, ajvOptions) => {
+  const options = { ...ajvDefaults, ...ajvOptions }
+  return compileSchema(schema, options)
+}

website/docs/upgrade/4-5.md

@@ -133,6 +133,7 @@ No change
 ### [validator](/docs/middlewares/validator)
 
 - Use `preferredLanguage` from `context` instead of `event` (See http-content-negotiation).
+- `ajv-cmd` is no longer a required dependency, if you're pre-transpiling you'll need to run `npm i ajv-cmd`.
 
 ### [warmup](/docs/middlewares/warmup)