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update gulp 4 notes on README (prebid#3154)
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jsnellbaker authored and AdSpacesDevelopers committed Jan 30, 2019
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Expand Up @@ -30,8 +30,15 @@ Working examples can be found in [the developer docs](http://prebid.org/dev-docs
$ npm install

*Note:* You need to have `NodeJS` 4.x or greater installed.
*Note:* Because we have transitioned to using gulp 4.0 - you need to have `gulp-cli` installed globally prior to running the general `npm install`. Run the following command to perform the install: `npm install gulp-cli -g`
If you have a previous version of `gulp` installed globally, you'll need to remove it before installing `gulp-cli`. This removal can be done with the command: `npm rm gulp -g`

*Note:* In the 1.24.0 release of Prebid.js we have transitioned to using gulp 4.0 from using gulp 3.9.1. To compily with gulp's recommended setup for 4.0, you'll need to have `gulp-cli` installed globally prior to running the general `npm install`. This shouldn't impact any other projects you may work on that use an earlier version of gulp in it's setup.

If you have a previous version of `gulp` installed globally, you'll need to remove it before installing `gulp-cli`. You can check if this is installed by running `gulp -v` and seeing the version that's listed in the `CLI` field of the output. If you have the `gulp` package installd globally, it's likely the same version that you'll see in the `Local` field. If you already have `gulp-cli` installed, it should be a lower major version (it's at version `2.0.1` at the time of the transition).

To remove the old package, you can use the command: `npm rm gulp -g`

Once setup, run the following command to globally install the `gulp-cli` package: `npm install gulp-cli -g`


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