RunKit + npm: fast-json-stringify

const fjs = require('fast-json-stringify') const x = fjs({ type: 'object', properties: { kind: { enum: ['foobar'] } // if we remove `type` we should not crash an leave all the feature as is now } }) console.log(x({ kind: 'hello' })) // works console.log(x({ kind: 'foobar' })) // works as expected