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Re:Use zsh as the default shell on your Mac by kevinherron on Tuesday June 04, 2019 @08:24AM (#20094271)
Fish 3.0 addresses the common `&&` and `||` operator incompatibility and if you pasted the first snippet it suggests that you should use `env`:

fish: Unsupported use of '='. To run 'yarn' with a modified environment, please use 'env PORT=5000 yarn…'

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