[Solved] Versions constraints on Coffeescript with useraccounts:unstyled

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You can “weaken” package version constraints by editing your .meteor/packages file and adding an ! to the package:

coffeescript@2.4.1! # note the !

To quote the changelog:

If a package version constraint in .meteor/packages ends with a !
character, any other (non-!) constraints on that package elsewhere in
the application will be weakened to allow any version greater than or
equal to the constraint, even if the major/minor versions do not match.

For example, using both CoffeeScript 2 and practicalmeteor:mocha used
to be impossible (or at least very difficult) because of this
api.versionsFrom("1.3")
statement, which unfortunately constrained the coffeescript package to
version 1.x. In Meteor 1.8, if you want to update coffeescript to
2.x, you can relax the practicalmeteor:mocha constraint by putting

coffeescript@2.2.1_1! # note the !

in your .meteor/packages file. The coffeescript version still needs
to be at least 1.x, so that practicalmeteor:mocha can count on that
minimum. However, practicalmeteor:mocha will no longer constrain the
major version of coffeescript, so coffeescript@2.2.1_1 will work.

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