force axios to use http adapter

If jest/jsdom is used then a polyfill for xhr is created which will cause axios to default the adapter to it. Since jsdom logs all errors use of wait-on will have any failed attempts to connect logged which is rather noisy and misleading.

By forcing axios to use the node.js http adapter instead this problem is bypassed keeping logs clean.

lib/wait-on.js

@@ -6,11 +6,15 @@ const Joi = require('@hapi/joi');
 const https = require('https');
 const net = require('net');
 const util = require('util');
-const axios = require('axios').default;
+const axiosPkg = require('axios').default;
+const axiosHttpAdapter = require('axios/lib/adapters/http');
 const { isBoolean, isEmpty, negate, noop, once, partial, pick, zip } = require('lodash/fp');
 const { NEVER, combineLatest, from, merge, throwError, timer } = require('rxjs');
 const { distinctUntilChanged, map, mergeMap, scan, startWith, take, takeWhile } = require('rxjs/operators');
 
+// force http adapter for axios, otherwise if using jest/jsdom xhr might
+// be used and it logs all errors polluting the logs
+const axios = axiosPkg.create({ adapter: axiosHttpAdapter });
 const isNotABoolean = negate(isBoolean);
 const isNotEmpty = negate(isEmpty);
 const fstat = promisify(fs.stat);