TestsNodejs - compilers deprecation in mocha and babel - node.js

Question

I'm building api rest on node with integration test (Babel, chai, mocha)
I changed
--compilers js:babel-core/register
for
--require babel-core/register
as recommended by the documentation:
https://github.com/mochajs/mocha/wiki/compilers-deprecation
But when I make this change in my mocha.opts file, the error appears:
C:\Users\Ranulfo\Desktop\noderest>npm run test-integration
> noderest#1.0.0 test-integration C:\Users\Ranulfo\Desktop\noderest
> mocha --opts test/integration/mocha.opts test/integration/*.js
C:\Users\Ranulfo\Desktop\noderest\test\integration\helpers.js:1
(function (exports, require, module, __filename, __dirname) { import supertest f
rom 'supertest';
^^^^^^
SyntaxError: Unexpected token import
For more details of the code:
mocha.opts(test/integration/mocha):
--require test/integration/helpers.js
--reporter spec
--require babel-core/register
--slow 5000
helpers.js (test/integration/helpers.js)
import supertest from 'supertest';
import chai from 'chai';
import app from '../../app';
global.app = app;
global.request = supertest(app);
global.expect = chai.expect;
package.json
{
"name": "noderest",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "babel-node ./index.js",
"test": "echo \"Error: no test specified\" && exit 1",
"test-integration": "mocha --opts test/integration/mocha.opts test/integration/*.js"
},
"author": "",
"license": "ISC",
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-core": "^6.26.3",
"babel-preset-env": "^1.7.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-node6": "^11.0.0",
"babel-preset-stage-2": "^6.24.1",
"babel-register": "^6.26.0",
"chai": "^4.1.2",
"mocha": "^5.2.0",
"supertest": "^3.1.0"
},
"dependencies": {
"express": "^4.16.3",
"sequelize": "^4.37.10",
"sqlite3": "^4.0.0"
}
}
.babelrc
{
"presets": ["env"]
}

Answer 1

For the people who are just here due to the error of deprecation notice of using compilers and have no other issues with the babel.
Just install the dependency #babel/register.
And change the test script from mocha --compilers js:babel-core/register to mocha --require #babel/register
This should solve your error regarding the error notice from mocha.

Answer 2

With the update of "Babel" for version 7, the addition of some configuration steps has occurred.
To adjust the "bug" do the following steps:
Install the specified dependency:
npm install --save-dev # babel / register
Change the "mocha.opts" file to the compilers for the following line:
--compilers js: # babel / register
Once this is done, your workflow should be normalized. (I.e.
Note: Look out for the following dependencies that are not present in the tutorial.
npm install --save-dev #babel/cli
npm install --save-dev #babel/core
npm install --save-dev #babel/node
npm install --save-dev #babel/preset-env
npm install --save-dev #babel/register
Auxiliary content:
Setup: https://babeljs.io/setup#installation
Migration: https://babeljs.io/docs/en/v7-migration
Mocha issues - Compilers deprecation https://github.com/mochajs/mocha/wiki/compilers-deprecation