Do not use babel loose mode, to resolve warning

[holly-cummins]

Loose mode triggers a huge volume of warnings in the build logs; it also risks slightly broken semantics, potentially,

warning Though the "loose" option was set to "false" in your @babel/preset-env config, it will not be used for @babel/plugin-transform-class-properties since the "loose" mode option was set to "true" for @babel/plugin-transform-private-property-in-object.
The "loose" option must be the same for @babel/plugin-transform-class-properties, @babel/plugin-transform-private-methods and @babel/plugin-transform-private-property-in-object (when they are enabled): you can silence this warning by explicitly adding
	["@babel/plugin-transform-class-properties", { "loose": true }]
to the "plugins" section of your Babel config.

[github-actions]

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