[Nodejs] json-schema-ref-parser loading bug ...

a.json

{ "oneOf" : [
        { "type" : "null" },
        { "type" : "string" },
        { "type" : "array", "items": { "type" : "string" } }
] }

b.json

{
    "type"          : "object",
    "properties"    : {
        "x"         : { "$ref": "./a.json" },
        "y"         : { "$ref": "./a.json" }
    }
}

c.json

{
    "oneOf"             : [
        { "$ref" : "./null.json" },
        { "$ref" : "./b.json" }
    ]
}

d.json

{
    "oneOf"             : [
        { "$ref" : "./null.json" },
        { "$ref" : "./b.json" }
    ]
}

fail.js

const $RefParser = require('json-schema-ref-parser');

const opts  = {
    resolve : {
        node_require : {
            order    : 1,
            canRead  : file => true,
            read     : file => require(file.url),
        }
    }
};


$RefParser.bundle(__dirname + '/c.json', opts).then(s1 =>
    $RefParser.bundle(__dirname + '/d.json', opts).then (s2 => {
        console.log('TADA!', s1, s2);
})).catch(e => console.error(e));

pass.js

const clonedeep  = require('lodash.clonedeep');
const $RefParser = require('json-schema-ref-parser');

const opts  = {
    resolve : {
        node_require : {
            order    : 1,
            canRead  : file => true,
            read     : file => clonedeep(require(file.url)),
        }
    }
};

$RefParser.bundle(__dirname + '/c.json', opts).then(s1 =>
    $RefParser.bundle(__dirname + '/d.json', opts).then (s2 => {
        console.log('TADA!', s1, s2);
})).catch(e => console.error(e));