Class constructor XYZ cannot be invoked without 'new'

[mschipperheyn]

There is a problem that I have when extending classes from packages in node_modules e.g. sequelize and other tools such as apollo-rest-client. It is caused by trying to extend transpiled classes.

Discussions about this can be found here:
sequelize/sequelize#7840
apollographql/apollo-server#2216
and many other places.

There is a PR open for this issue @babel babel/babel#8656 bur who knows if and when it gets merged.

The common suggested workaround is applying

               [
			"@babel/preset-env",
			{
				"targets": {
					"node": "current"
				}
			}
		]

Unfortunately, that doesn't work with razzle, presumably because @babel/plugin-transform-runtime is used which is one of the other suggestions to solve this: remove that library.

Does anyone have this same problem and possibly a workaround? It's starting to hit me in more and more of the libraries I want to use.

[mschipperheyn]

Workaround / Fixed:

babel.config.js

const razzleBabel = require('razzle/babel');

module.exports = function babelConfig(api) {
	api.cache(true);

	const babel = razzleBabel();

	babel.presets[0] =
		process.env.BUILD_TARGET === 'client'
			? [
				require.resolve('@babel/preset-env'),
				{
					modules: false,
				},
			  ]
			: [
				require.resolve('@babel/preset-env'),
				{
					targets: {
						node: 'current',
					},
					exclude: [
						'babel-plugin-transform-classes',
						'@babel/plugin-transform-classes',
					],
					modules: false,
				},
			  ];
              [...]

[1Jesper1]

Hello @mschipperheyn Could you describe your fix? When I add

targets: {
 node: 'current',
},

to my babel.rc I get the following error:

ReferenceError: regeneratorRuntime is not defined

Babel 7 and Node 12