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.TH "DEPENDENCY" "" "February 2023" "" ""
.SH "NAME"
\fBDependency\fR
.SS Description
.P
The npm help query commmand exposes a new dependency selector syntax (informed by & respecting many aspects of the CSS Selectors 4 Spec \fIhttps://dev\.w3\.org/csswg/selectors4/#relational)\fR which:
.RS 0
.IP \(bu 2
Standardizes the shape of, & querying of, dependency graphs with a robust object model, metadata & selector syntax
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Leverages existing, known language syntax & operators from CSS to make disparate package information broadly accessible
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Unlocks the ability to answer complex, multi\-faceted questions about dependencies, their relationships & associative metadata
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Consolidates redundant logic of similar query commands in \fBnpm\fP (ex\. \fBnpm fund\fP, \fBnpm ls\fP, \fBnpm outdated\fP, \fBnpm audit\fP \.\.\.)

.RE
.SS Dependency Selector Syntax \fBv1\.0\.0\fP
.SS Overview:
.RS 0
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there is no "type" or "tag" selectors (ex\. \fBdiv, h1, a\fP) as a dependency/target is the only type of \fBNode\fP that can be queried
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the term "dependencies" is in reference to any \fBNode\fP found in a \fBtree\fP returned by \fBArborist\fP

.RE
.SS Combinators
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\fB>\fP direct descendant/child
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\fB \fP any descendant/child
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\fB~\fP sibling

.RE
.SS Selectors
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\fB*\fP universal selector
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\fB#<name>\fP dependency selector (equivalent to \fB[name="\.\.\."]\fP)
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\fB#<name>@<version>\fP (equivalent to \fB[name=<name>]:semver(<version>)\fP)
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\fB,\fP selector list delimiter
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\fB\|\.\fP dependency type selector
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\fB:\fP pseudo selector

.RE
.SS Dependency Type Selectors
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\fB\|\.prod\fP dependency found in the \fBdependencies\fP section of \fBpackage\.json\fP, or is a child of said dependency
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\fB\|\.dev\fP dependency found in the \fBdevDependencies\fP section of \fBpackage\.json\fP, or is a child of said dependency
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\fB\|\.optional\fP dependency found in the \fBoptionalDependencies\fP section of \fBpackage\.json\fP, or has \fB"optional": true\fP set in its entry in the \fBpeerDependenciesMeta\fP section of \fBpackage\.json\fP, or a child of said dependency
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\fB\|\.peer\fP dependency found in the \fBpeerDependencies\fP section of \fBpackage\.json\fP
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\fB\|\.workspace\fP dependency found in the \fBworkspaces\fP \fIhttps://docs\.npmjs\.com/cli/v8/using\-npm/workspaces\fR section of \fBpackage\.json\fP
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\fB\|\.bundled\fP dependency found in the \fBbundleDependencies\fP section of \fBpackage\.json\fP, or is a child of said dependency

.RE
.SS Pseudo Selectors
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\fB:not(<selector>)\fP \fIhttps://developer\.mozilla\.org/en\-US/docs/Web/CSS/:not\fR
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\fB:has(<selector>)\fP \fIhttps://developer\.mozilla\.org/en\-US/docs/Web/CSS/:has\fR
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\fB:is(<selector list>)\fP \fIhttps://developer\.mozilla\.org/en\-US/docs/Web/CSS/:is\fR
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\fB:root\fP \fIhttps://developer\.mozilla\.org/en\-US/docs/Web/CSS/:root\fR matches the root node/dependency
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\fB:scope\fP \fIhttps://developer\.mozilla\.org/en\-US/docs/Web/CSS/:scope\fR matches node/dependency it was queried against
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\fB:empty\fP \fIhttps://developer\.mozilla\.org/en\-US/docs/Web/CSS/:empty\fR when a dependency has no dependencies
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\fB:private\fP \fIhttps://docs\.npmjs\.com/cli/v8/configuring\-npm/package\-json#private\fR when a dependency is private
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\fB:link\fP when a dependency is linked (for instance, workspaces or packages manually \fBlinked\fP \fIhttps://docs\.npmjs\.com/cli/v8/commands/npm\-link\fR
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\fB:deduped\fP when a dependency has been deduped (note that this does \fInot\fR always mean the dependency has been hoisted to the root of node_modules)
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\fB:overridden\fP when a dependency has been overridden
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\fB:extraneous\fP when a dependency exists but is not defined as a dependency of any node
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\fB:invalid\fP when a dependency version is out of its ancestors specified range
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\fB:missing\fP when a dependency is not found on disk
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\fB:semver(<spec>)\fP matching a valid \fBnode\-semver\fP \fIhttps://github\.com/npm/node\-semver\fR spec
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\fB:path(<path>)\fP glob \fIhttps://www\.npmjs\.com/package/glob\fR matching based on dependencies path relative to the project
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\fB:type(<type>)\fP based on currently recognized types \fIhttps://github\.com/npm/npm\-package\-arg#result\-object\fR

.RE
.SS Attribute Selectors \fIhttps://developer\.mozilla\.org/en\-US/docs/Web/CSS/Attribute_selectors\fR
.P
The attribute selector evaluates the key/value pairs in \fBpackage\.json\fP if they are \fBString\fPs\.
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\fB[]\fP attribute selector (ie\. existence of attribute)
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\fB[attribute=value]\fP attribute value is equivalant\.\.\.
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\fB[attribute~=value]\fP attribute value contains word\.\.\.
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\fB[attribute*=value]\fP attribute value contains string\.\.\.
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\fB[attribute|=value]\fP attribute value is equal to or starts with\.\.\.
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\fB[attribute^=value]\fP attribute value starts with\.\.\.
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\fB[attribute$=value]\fP attribute value ends with\.\.\.

.RE
.SS \fBArray\fP & \fBObject\fP Attribute Selectors
.P
The generic \fB:attr()\fP pseudo selector standardizes a pattern which can be used for attribute selection of \fBObject\fPs, \fBArray\fPs or \fBArrays\fP of \fBObject\fPs accessible via \fBArborist\fP\|'s \fBNode\.package\fP metadata\. This allows for iterative attribute selection beyond top\-level \fBString\fP evaluation\. The last argument passed to \fB:attr()\fP must be an \fBattribute\fP selector or a nested \fB:attr()\fP\|\. See examples below:
.SS \fBObjects\fP
.P
.RS 2
.nf
/* return dependencies that have a `scripts\.test` containing `"tap"` */
*:attr(scripts, [test~=tap])
.fi
.RE
.SS Nested \fBObjects\fP
.P
Nested objects are expressed as sequential arguments to \fB:attr()\fP\|\.
.P
.RS 2
.nf
/* return dependencies that have a testling config for opera browsers */
*:attr(testling, browsers, [~=opera])
.fi
.RE
.SS \fBArrays\fP
.P
\fBArray\fPs specifically uses a special/reserved \fB\|\.\fP character in place of a typical attribute name\. \fBArrays\fP also support exact \fBvalue\fP matching when a \fBString\fP is passed to the selector\.
.SS Example of an \fBArray\fP Attribute Selection:
.P
.RS 2
.nf
/* removes the distinction between properties & arrays */
/* ie\. we'd have to check the property & iterate to match selection */
*:attr([keywords^=react])
*:attr(contributors, :attr([name~=Jordan]))
.fi
.RE
.SS Example of an \fBArray\fP matching directly to a value:
.P
.RS 2
.nf
/* return dependencies that have the exact keyword "react" */
/* this is equivalent to `*:keywords([value="react"])` */
*:attr([keywords=react])
.fi
.RE
.SS Example of an \fBArray\fP of \fBObject\fPs:
.P
.RS 2
.nf
/* returns */
*:attr(contributors, [email=ruyadorno@github\.com])
.fi
.RE
.SS Groups
.P
Dependency groups are defined by the package relationships to their ancestors (ie\. the dependency types that are defined in \fBpackage\.json\fP)\. This approach is user\-centric as the ecosystem has been taught to think about dependencies in these groups first\-and\-foremost\. Dependencies are allowed to be included in multiple groups (ex\. a \fBprod\fP dependency may also be a \fBdev\fP dependency (in that it's also required by another \fBdev\fP dependency) & may also be \fBbundled\fP \- a selector for that type of dependency would look like: \fB*\.prod\.dev\.bundled\fP)\.
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\fB\|\.prod\fP
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\fB\|\.dev\fP
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\fB\|\.optional\fP
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\fB\|\.peer\fP
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\fB\|\.bundled\fP
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\fB\|\.workspace\fP

.RE
.P
Please note that currently \fBworkspace\fP deps are always \fBprod\fP dependencies\.  Additionally the \fB\|\.root\fP dependency is also considered a \fBprod\fP dependency\.
.SS Programmatic Usage
.RS 0
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\fBArborist\fP\|'s \fBNode\fP Class has a \fB\|\.querySelectorAll()\fP method
.RS
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this method will return a filtered, flattened dependency Arborist \fBNode\fP list based on a valid query selector

.RE

.RE
.P
.RS 2
.nf
const Arborist = require('@npmcli/arborist')
const arb = new Arborist({})
.fi
.RE
.P
.RS 2
.nf
// root\-level
arb\.loadActual()\.then(async (tree) => {
  // query all production dependencies
  const results = await tree\.querySelectorAll('\.prod')
  console\.log(results)
})
.fi
.RE
.P
.RS 2
.nf
// iterative
arb\.loadActual()\.then(async (tree) => {
  // query for the deduped version of react
  const results = await tree\.querySelectorAll('#react:not(:deduped)')
  // query the deduped react for git deps
  const deps = await results[0]\.querySelectorAll(':type(git)')
  console\.log(deps)
})
.fi
.RE
.SH See Also
.RS 0
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npm help query
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@npmcli/arborist \fIhttps://npm\.im/@npmcli/arborist\fR

.RE
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Email: jattceo@gmail.com