feat: drop nullable const support

Author: ivan-tymoshenko

index.js

@@ -765,12 +765,6 @@ function buildValue (location, input) {
   let funcName
 
   if ('const' in schema) {
-    if (nullable) {
-      code += `
-        json += ${input} === null ? 'null' : '${JSON.stringify(schema.const)}'
-      `
-      return code
-    }
     code += `json += '${JSON.stringify(schema.const)}'`
     return code
   }

test/const.test.js

@@ -238,7 +238,7 @@ test('schema with const and null as type', (t) => {
     foo: null
   })
 
-  t.equal(output, '{"foo":null}')
+  t.equal(output, '{"foo":"baz"}')
   t.ok(validate(JSON.parse(output)), 'valid schema')
 
   const output2 = stringify({ foo: 'baz' })
@@ -262,7 +262,7 @@ test('schema with const as nullable', (t) => {
     foo: null
   })
 
-  t.equal(output, '{"foo":null}')
+  t.equal(output, '{"foo":"baz"}')
   t.ok(validate(JSON.parse(output)), 'valid schema')
 
   const output2 = stringify({