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After migrating to the Focal version 0.8.1, I have got the same error as in issue #66. It turned out that the reason was that the effectful module
lens/json.js
did not make it to the production bundle becausesideEffects
were set tofalse
inpackage.json
. However, thesideEffects
update in the MR #65 did not fix the problem, and the module was still not included in the bundle. I have found that we also need to add thelens/index.js
module to thesideEffects
forlens/json.js
module to appear in the production build.After adding this module to the
sideEffects
field, thelens/json
module is added to the bundle and the.key is not a function
error does not happen anymore.