Justin Van Patten fbe96394a1 Add ability to opt-in to using yarn instead of npm (#3556) ... This change adds support for setting `PULUMI_PREFER_YARN` to true to opt-in to preferring `yarn` over `npm` when installing Node.js dependencies (and publishing Policy Packs). If `PULUMI_PREFER_YARN` is truthy, but `yarn` cannot be found on `$PATH`, we fallback to using `npm`. If `npm` can't be found on `$PATH`, we provide a more helpful error message.		2019-11-21 20:59:48 +00:00
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npm.go	Add ability to opt-in to using yarn instead of npm (#3556)	2019-11-21 20:59:48 +00:00