refactor: replace typeof undefined check

lib/spec/openapi/utils.js

@@ -222,9 +222,9 @@ function plainJsonObjectToOpenapi3 (container, jsonSchema, externalSchemas, secu
       const jsonSchema = toOpenapiProp(propKey, obj[propKey])
       if (jsonSchema.schema) {
         // it is needed as required in schema is invalid prop - delete only if needed
-        if (typeof jsonSchema.schema.required !== 'undefined') delete jsonSchema.schema.required
+        if (jsonSchema.schema.required !== undefined) delete jsonSchema.schema.required
         // it is needed as description in schema is invalid prop - delete only if needed
-        if (typeof jsonSchema.schema.description !== 'undefined') delete jsonSchema.schema.description
+        if (jsonSchema.schema.description !== undefined) delete jsonSchema.schema.description
       }
       return jsonSchema
     })
@@ -252,7 +252,7 @@ function schemaToMedia (schema) {
 
 function resolveBodyParams (body, schema, consumes, ref) {
   const resolved = transformDefsToComponents(ref.resolve(schema))
-  if ((Array.isArray(consumes) && consumes.length === 0) || typeof consumes === 'undefined') {
+  if ((Array.isArray(consumes) && consumes.length === 0) || consumes === undefined) {
     consumes = ['application/json']
   }
 
@@ -339,7 +339,7 @@ function resolveResponse (fastifyResponseJson, produces, ref) {
       } else {
         const content = {}
 
-        if ((Array.isArray(produces) && produces.length === 0) || typeof produces === 'undefined') {
+        if ((Array.isArray(produces) && produces.length === 0) || produces === undefined) {
           produces = ['application/json']
         }
 

lib/util/resolve-local-ref.js

@@ -4,7 +4,7 @@ const { rawRequired } = require('../symbols')
 const { xConsume } = require('../constants')
 
 function resolveLocalRef (jsonSchema, externalSchemas) {
-  if (typeof jsonSchema.type !== 'undefined' && typeof jsonSchema.properties !== 'undefined') {
+  if (jsonSchema.type !== undefined && jsonSchema.properties !== undefined) {
     // for the shorthand querystring/params/headers declaration
     const propertiesMap = Object.keys(jsonSchema.properties).reduce((acc, headers) => {
       const rewriteProps = {}

lib/util/resolve-swagger-function.js

@@ -1,7 +1,7 @@
 'use strict'
 
 function resolveSwaggerFunction (opts, cache, routes, Ref, done) {
-  if (typeof opts.openapi === 'undefined' || opts.openapi === null) {
+  if (opts.openapi === undefined || opts.openapi === null) {
     return require('../spec/swagger')(opts, cache, routes, Ref, done)
   } else {
     return require('../spec/openapi')(opts, cache, routes, Ref, done)