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Merge pull request #1124 from LaurentGoderre/pull-1042 

Update Upgrading/downgrading Yarn best practice
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Laurent Goderre 2019-10-10 13:41:25 +00:00 committed by GitHub
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@ -32,12 +32,28 @@ ENV PATH=$PATH:/home/node/.npm-global/bin # optionally if you want to run npm gl
## Upgrading/downgrading Yarn
If you need to upgrade/downgrade `yarn`, you can do so by issuing the following commands in your `Dockerfile`:
### Local
If you need to upgrade/downgrade `yarn` for a local install, you can do so by issuing the following commands in your `Dockerfile`:
> Note that if you create some other directory which is not a descendant one from where you ran the command, you will end up using the global (dated) version. If you wish to upgrade `yarn` globally follow the instructions in the next section.
> When following the local install instructions, due to duplicated yarn the image will end up being bigger.
```Dockerfile
FROM node:6
ENV YARN_VERSION 1.5.1
ENV YARN_VERSION 1.16.0
RUN yarn policies set-version $YARN_VERSION
```
### Global
```Dockerfile
FROM node:6
ENV YARN_VERSION 1.16.0
RUN curl -fSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz" \
&& tar -xzf yarn-v$YARN_VERSION.tar.gz -C /opt/ \