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.TH "NPM\-SCRIPTS" "7" "August 2018" "" ""
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.SH "NAME"
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\fBnpm-scripts\fR \- How npm handles the "scripts" field
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.SH DESCRIPTION
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.P
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npm supports the "scripts" property of the package\.json file, for the
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following scripts:
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.RS 0
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.IP \(bu 2
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prepublish:
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Run BEFORE the package is packed and published, as well as on local \fBnpm
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install\fP without any arguments\. (See below)
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.IP \(bu 2
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prepare:
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Run both BEFORE the package is packed and published, and on local \fBnpm
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install\fP without any arguments (See below)\. This is run
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AFTER \fBprepublish\fP, but BEFORE \fBprepublishOnly\fP\|\.
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.IP \(bu 2
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prepublishOnly:
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Run BEFORE the package is prepared and packed, ONLY on \fBnpm publish\fP\|\. (See
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below\.)
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.IP \(bu 2
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prepack:
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run BEFORE a tarball is packed (on \fBnpm pack\fP, \fBnpm publish\fP, and when
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installing git dependencies)
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.IP \(bu 2
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postpack:
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Run AFTER the tarball has been generated and moved to its final destination\.
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.IP \(bu 2
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publish, postpublish:
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Run AFTER the package is published\.
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.IP \(bu 2
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preinstall:
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Run BEFORE the package is installed
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.IP \(bu 2
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install, postinstall:
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Run AFTER the package is installed\.
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.IP \(bu 2
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preuninstall, uninstall:
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Run BEFORE the package is uninstalled\.
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.IP \(bu 2
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postuninstall:
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Run AFTER the package is uninstalled\.
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.IP \(bu 2
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preversion:
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Run BEFORE bumping the package version\.
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.IP \(bu 2
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version:
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Run AFTER bumping the package version, but BEFORE commit\.
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.IP \(bu 2
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postversion:
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Run AFTER bumping the package version, and AFTER commit\.
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.IP \(bu 2
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pretest, test, posttest:
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Run by the \fBnpm test\fP command\.
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.IP \(bu 2
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prestop, stop, poststop:
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Run by the \fBnpm stop\fP command\.
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.IP \(bu 2
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prestart, start, poststart:
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Run by the \fBnpm start\fP command\.
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.IP \(bu 2
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prerestart, restart, postrestart:
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Run by the \fBnpm restart\fP command\. Note: \fBnpm restart\fP will run the
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stop and start scripts if no \fBrestart\fP script is provided\.
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.IP \(bu 2
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preshrinkwrap, shrinkwrap, postshrinkwrap:
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Run by the \fBnpm shrinkwrap\fP command\.
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.RE
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.P
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Additionally, arbitrary scripts can be executed by running \fBnpm
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run\-script <stage>\fP\|\. \fIPre\fR and \fIpost\fR commands with matching
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names will be run for those as well (e\.g\. \fBpremyscript\fP, \fBmyscript\fP,
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\fBpostmyscript\fP)\. Scripts from dependencies can be run with `npm explore
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.P
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<pkg> \-\- npm run <stage>`\.
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.SH PREPUBLISH AND PREPARE
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.SS DEPRECATION NOTE
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.P
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Since \fB, the npm CLI has run the\fPprepublish\fBscript for both\fPnpm
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publish\fBand\fPnpm install\fB, because it's a convenient way to prepare a package
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for use (some common use cases are described in the section below)\. It has
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also turned out to be, in practice, [very
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confusing](https://github\.com/npm/npm/issues/10074)\. As of\fP\fB, a new
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event has been introduced,\fPprepare\fB, that preserves this existing behavior\. A
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_new_ event,\fPprepublishOnly\fBhas been added as a transitional strategy to
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allow users to avoid the confusing behavior of existing npm versions and only
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run on\fPnpm publish` (for instance, running the tests one last time to ensure
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they're in good shape)\.
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.P
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See https://github\.com/npm/npm/issues/10074 for a much lengthier
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justification, with further reading, for this change\.
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.SS USE CASES
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.P
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If you need to perform operations on your package before it is used, in a way
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that is not dependent on the operating system or architecture of the
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target system, use a \fBprepublish\fP script\. This includes
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tasks such as:
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.RS 0
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.IP \(bu 2
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Compiling CoffeeScript source code into JavaScript\.
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.IP \(bu 2
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Creating minified versions of JavaScript source code\.
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.IP \(bu 2
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Fetching remote resources that your package will use\.
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.RE
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.P
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The advantage of doing these things at \fBprepublish\fP time is that they can be done once, in a
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single place, thus reducing complexity and variability\.
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Additionally, this means that:
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.RS 0
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.IP \(bu 2
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You can depend on \fBcoffee\-script\fP as a \fBdevDependency\fP, and thus
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your users don't need to have it installed\.
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.IP \(bu 2
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You don't need to include minifiers in your package, reducing
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the size for your users\.
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.IP \(bu 2
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You don't need to rely on your users having \fBcurl\fP or \fBwget\fP or
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other system tools on the target machines\.
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.RE
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.SH DEFAULT VALUES
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.P
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npm will default some script values based on package contents\.
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.RS 0
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.IP \(bu 2
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\fB"start": "node server\.js"\fP:
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If there is a \fBserver\.js\fP file in the root of your package, then npm
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will default the \fBstart\fP command to \fBnode server\.js\fP\|\.
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.IP \(bu 2
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\fB"install": "node\-gyp rebuild"\fP:
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If there is a \fBbinding\.gyp\fP file in the root of your package and you
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haven't defined your own \fBinstall\fP or \fBpreinstall\fP scripts, npm will
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default the \fBinstall\fP command to compile using node\-gyp\.
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.RE
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.SH USER
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.P
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If npm was invoked with root privileges, then it will change the uid
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to the user account or uid specified by the \fBuser\fP config, which
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defaults to \fBnobody\fP\|\. Set the \fBunsafe\-perm\fP flag to run scripts with
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root privileges\.
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.SH ENVIRONMENT
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.P
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Package scripts run in an environment where many pieces of information
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are made available regarding the setup of npm and the current state of
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the process\.
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.SS path
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.P
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If you depend on modules that define executable scripts, like test
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suites, then those executables will be added to the \fBPATH\fP for
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executing the scripts\. So, if your package\.json has this:
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.P
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.RS 2
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.nf
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{ "name" : "foo"
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, "dependencies" : { "bar" : "0\.1\.x" }
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, "scripts": { "start" : "bar \./test" } }
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.fi
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.RE
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.P
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then you could run \fBnpm start\fP to execute the \fBbar\fP script, which is
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exported into the \fBnode_modules/\.bin\fP directory on \fBnpm install\fP\|\.
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.SS package\.json vars
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.P
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The package\.json fields are tacked onto the \fBnpm_package_\fP prefix\. So,
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for instance, if you had \fB{"name":"foo", "version":"1\.2\.5"}\fP in your
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package\.json file, then your package scripts would have the
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\fBnpm_package_name\fP environment variable set to "foo", and the
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\fBnpm_package_version\fP set to "1\.2\.5"\. You can access these variables
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in your code with \fBprocess\.env\.npm_package_name\fP and
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\fBprocess\.env\.npm_package_version\fP, and so on for other fields\.
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.SS configuration
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.P
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Configuration parameters are put in the environment with the
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\fBnpm_config_\fP prefix\. For instance, you can view the effective \fBroot\fP
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config by checking the \fBnpm_config_root\fP environment variable\.
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.SS Special: package\.json "config" object
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.P
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The package\.json "config" keys are overwritten in the environment if
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there is a config param of \fB<name>[@<version>]:<key>\fP\|\. For example,
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if the package\.json has this:
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.P
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.RS 2
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.nf
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{ "name" : "foo"
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, "config" : { "port" : "8080" }
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, "scripts" : { "start" : "node server\.js" } }
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.fi
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.RE
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.P
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and the server\.js is this:
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.P
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.RS 2
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.nf
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http\.createServer(\.\.\.)\.listen(process\.env\.npm_package_config_port)
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.fi
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.RE
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.P
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then the user could change the behavior by doing:
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.P
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.RS 2
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.nf
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npm config set foo:port 80
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.fi
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.RE
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.SS current lifecycle event
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.P
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Lastly, the \fBnpm_lifecycle_event\fP environment variable is set to
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whichever stage of the cycle is being executed\. So, you could have a
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single script used for different parts of the process which switches
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based on what's currently happening\.
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.P
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Objects are flattened following this format, so if you had
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\fB{"scripts":{"install":"foo\.js"}}\fP in your package\.json, then you'd
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see this in the script:
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.P
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.RS 2
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.nf
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process\.env\.npm_package_scripts_install === "foo\.js"
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.fi
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.RE
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.SH EXAMPLES
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.P
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For example, if your package\.json contains this:
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.P
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.RS 2
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.nf
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{ "scripts" :
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{ "install" : "scripts/install\.js"
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, "postinstall" : "scripts/install\.js"
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, "uninstall" : "scripts/uninstall\.js"
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}
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}
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.fi
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.RE
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.P
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then \fBscripts/install\.js\fP will be called for the install
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and post\-install stages of the lifecycle, and \fBscripts/uninstall\.js\fP
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will be called when the package is uninstalled\. Since
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\fBscripts/install\.js\fP is running for two different phases, it would
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be wise in this case to look at the \fBnpm_lifecycle_event\fP environment
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variable\.
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.P
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If you want to run a make command, you can do so\. This works just
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fine:
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.P
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.RS 2
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.nf
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{ "scripts" :
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{ "preinstall" : "\./configure"
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, "install" : "make && make install"
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, "test" : "make test"
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}
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}
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.fi
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.RE
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.SH EXITING
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.P
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Scripts are run by passing the line as a script argument to \fBsh\fP\|\.
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.P
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If the script exits with a code other than 0, then this will abort the
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process\.
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.P
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Note that these script files don't have to be nodejs or even
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javascript programs\. They just have to be some kind of executable
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file\.
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.SH HOOK SCRIPTS
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.P
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If you want to run a specific script at a specific lifecycle event for
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ALL packages, then you can use a hook script\.
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.P
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Place an executable file at \fBnode_modules/\.hooks/{eventname}\fP, and
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it'll get run for all packages when they are going through that point
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in the package lifecycle for any packages installed in that root\.
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.P
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Hook scripts are run exactly the same way as package\.json scripts\.
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That is, they are in a separate child process, with the env described
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above\.
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.SH BEST PRACTICES
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.RS 0
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.IP \(bu 2
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Don't exit with a non\-zero error code unless you \fIreally\fR mean it\.
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Except for uninstall scripts, this will cause the npm action to
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fail, and potentially be rolled back\. If the failure is minor or
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only will prevent some optional features, then it's better to just
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print a warning and exit successfully\.
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.IP \(bu 2
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Try not to use scripts to do what npm can do for you\. Read through
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npm help 5 \fBpackage\.json\fP to see all the things that you can specify and enable
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by simply describing your package appropriately\. In general, this
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will lead to a more robust and consistent state\.
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.IP \(bu 2
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Inspect the env to determine where to put things\. For instance, if
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the \fBnpm_config_binroot\fP environment variable is set to \fB/home/user/bin\fP, then
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don't try to install executables into \fB/usr/local/bin\fP\|\. The user
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probably set it up that way for a reason\.
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.IP \(bu 2
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Don't prefix your script commands with "sudo"\. If root permissions
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are required for some reason, then it'll fail with that error, and
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the user will sudo the npm command in question\.
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.IP \(bu 2
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Don't use \fBinstall\fP\|\. Use a \fB\|\.gyp\fP file for compilation, and \fBprepublish\fP
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for anything else\. You should almost never have to explicitly set a
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preinstall or install script\. If you are doing this, please consider if
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there is another option\. The only valid use of \fBinstall\fP or \fBpreinstall\fP
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scripts is for compilation which must be done on the target architecture\.
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.RE
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.SH SEE ALSO
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.RS 0
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.IP \(bu 2
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npm help run\-script
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.IP \(bu 2
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npm help 5 package\.json
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.IP \(bu 2
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npm help 7 developers
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.IP \(bu 2
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npm help install
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.RE
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