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README.md	README.md
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Analysis data and tools

Clj-kondo can provide data that was collected during linting, which enables writing tools and linters that are not yet in clj-kondo itself. To get this data, use the following configuration:

{:analysis true}

When using clj-kondo from the command line, the analysis data will be exported with {:output {:format ...}} set to :json or :edn.

Extra analysis

Further analysis can be returned by providing :analysis with a map of options:

{:analysis {... ...}

:locals: when truthy return :locals and :local-usages described below
:keywords: when truthy return :keywords described below
:arglists: when truthy return :arglists on :var-definitions
:protocol-impls: when truthy return :protocol-impls described below
:symbols: when truthy, return :symbols described below
:java-class-definitions: when truthy, return :java-class-definitions as described below.
:java-class-usages: when truthy, return :java-class-usages as described below.
:java-member-definitions: when truthy, return :java-member-definitions as described below.
:instance-invocations: when truthy, return :instance-invocations as described below.

Metadata

Clj-kondo returns common metadata such as :added and :deprecated. You can request that it return all, or a specific set, of user-coded namespace or var metadata via:

:namespace-definitions
- :meta: return user coded metadata under :namespace-definitions -> :meta, specify:
  - true: to return all
  - key sequence: return metadata matching specified keys, ex. [:skip-wiki :integration-test]
:var-definitions
- :meta: return user coded metadata under :var-definitions -> :meta, options are the same as for namespaces.

Context data

Built-in and custom hook can add arbitrary data to the analysis using a :context map. This context map will currently appear in :var-usages and :keywords. You can opt-in to the entire context map using :context true or select certain keys using :context [:re-frame.core].

Limited analysis

Similarly, analysis can be limited. This is useful to quickly scan a file or project. When using these expert options, you should not expect linters to behave correctly. As such, consider using them with :skip-lint true.

:var-usages: when falsy skip :var-usages described below
:var-definitions
- :shallow true: analyze :var-definitions, but skip their bodies

If you analyze var definitions shallowly, anything within the body of a form listed below will be skipped. That means that if you define a var within another defn (a discouraged practice), it won't be analyzed.

def
defn
defrecord
defmethod
plumatic schema: fn, def, defn, defmethod, defrecord
protocol-impls
fn
letfn
fn*
bound-fn

Data

The analysis output consists of a map with:

:namespace-definitions, a list of maps with:
- :filename, :row, :col
- :name: the name of the namespace
Optional:
- :lang: if definition occurred in a .cljc file, the language in which the definition was done: :clj or :cljs
- common metadata values: :deprecated, :doc, :author, :added, :no-doc (used by codox).
- :meta map of requested metadata for namespace
:namespace-usages, a list of maps with:
- :filename, :row, :col
- :from: the namespace which uses
- :to: the used namespace
- :alias: the alias of namespace, if used
Optional
- :lang: if usage occurred in a .cljc file, the language in which it was resolved: :clj or :cljs
:var-definitions, a list of maps with:
- :filename, :row, :col, end-row, end-col
- :ns: the namespace of the var
- :name: the name of the var
- :defined-by: the namespaced symbol which defined this var
Optional:
- :fixed-arities: a set of fixed arities
- :varargs-min-arity: the minimal number of arguments of a varargs signature
- common metadata values: :private, :macro, :deprecated, :doc, :added
- :meta map of requested metadata for var
- :lang: if definition occurred in a .cljc file, the language in which the definition was done: :clj or :cljs
- :arglists-str: a list of each set of args as written
- :protocol-ns, :protocol-name: the protocol namespace and name for a protocol method
:var-usages, a list of maps with:
- :filename
- :name: the name of the used var
- :row, col: the start position of this usage, the parenthesis start location if a function call
- :end-row, end-col: the end position of this usage, the parenthesis end location if a function call
- :name-row, :name-col: the start position of the name of this usage
- :name-end-row, :name-end-col: the end position of the name of this usage
- :from: the namespace from which the var was used
- :to: the namespace of the used var
- :from-var: the function name from which the var was used
Optional:
- :arity: if the usage was a function call, the amount of arguments passed
- :lang: if usage occurred in a .cljc file, the language in which the call was resolved: :clj or :cljs
- :defmethod: true when the usage is a defmethod
- :dispatch-val-str: the dispatch val of a defmethod, represented as a string
- several attributes of the used var: :private, :macro, :fixed-arities, :varargs-min-arity, :deprecated.
:locals, a list of maps with:
- :filename, :row, :col, :end-row, :end-col
- :id: an identification for this local, :local-usages will reference this
- :name: the name of the used local
- :str: the as written string of the local from the file and position
- :scope-end-row: the row in which this local will go out of scope
- :scope-end-col: the column in which this local will go out of scope
:local-usages, a list of maps with:
- :filename, :row, :col, :end-row, :end-col
- :name-row, :name-col, :name-end-row, :name-end-col
- :id: an identification for this local, refers to the local declaration with the same :id in :locals
- :name: the name of the used local
:keywords, a list of maps with:
- :filename, :row, :col, :end-row, :end-col
- :name: the name of the used keyword as string
- :ns: the namespace of the keyword.
  - :kw will have a nil ns.
  - ::kw will have the current ns.
  - :b/kw will have b as a ns regardless of requireed namespaces.
  - ::b/kw will be the aliased ns of b or :clj-kondo/unknown-namespace if b is not an alias.
  Keywords in namespaced maps:
  - #:b{:kw 1} will have b as ns.
  - #:b{:_/kw 1} will have no ns
  - #:b{:c/kw 1} will have c as ns.
  - #:b{::kw 1} will have the current ns.
- :alias: the alias used by the keyword. Only present when a valid, external alias.
  - ::a/kw would have an alias of a.
  - ::kw does not have an alias.
- :auto-resolved: if the keyword :ns is auto resolved, example: ::kw
- :namespace-from-prefix: if the keyword :ns is from the namespaced map, example: ::b{:kw 1}
- :keys-destructuring: if the keyword is within a :keys vector.
- :reg: can be added by :hooks using clj-kondo.hook-api/reg-keyword! to indicate a registered definition location for the keyword. It should be the fully qualified call that registered it.
:protocol-impls, a list of maps with:
- filename
- :row, :col, :end-row, :end-col, the range of the implementation method.
- :name-row, :name-col, :name-end-row, :name-end-col, the range of the implementation method name.
- protocol-name, the name of the protocol being implemented.
- protocol-ns, the namespace of the protocol being implemented.
- impl-ns, the namespace of the implementation of the protocol.
- method-name, the method name of the implementation.
- defined-by, the symbol that defines this, e.g. clojure.core/defrecord.
:symbols, a list of (namespaced) symbols that occur in quoted forms or EDN, i.e., they do not refer to vars or interop:
- filename
- :row, :col, :end-row, :end-col, the range of the symbol.
- :symbol: the symbol itself
- :from: the namespace from which the var was used
- :name: the name of the symbol
- :to: the namespace the symbol might refer to, if the namespace of the symbol can be resolved in the :from namespace (e.g. via an alias or via the namespace itself)
:java-class-definitions, a list of maps with:
- :class: full qualified class name.
- :uri: file URI of this class.
- filename
:java-member-definitions, a list of maps with:
- :class: full qualified class name of this member.
- :uri: file URI of the class.
- :name: name of this member.
- :parameter-types: list of strings of each parameter type if member is a method.
- :return-type: a string representing the return type if member is a method.
- :type: a string representing the type of this member if member is a field.
- :flags: a set of keywords that classify this member, like final, static, field, method, public.
:java-class-usages, a list of maps with:
- :class: full qualified class name.
- :uri: file URI of this class.
- filename
- :row, :col, :end-row, :end-col, the range of the usage.
- :name-row, :name-col, :name-end-row, :name-end-col the name range of the usage.
:instance-invocations, a list of maps with:
- filename
- :method-name: name of the method.
- :name-row, :name-col, :name-end-row, :name-end-col the name range of the invocation.

Example output after linting this code:

(ns foo
  "This is a useful namespace."
  {:deprecated "1.3"
   :author "Michiel Borkent"
   :no-doc true}
  (:require [clojure.set :as set]))

(defn- f [x]
  (inc x))

(defmacro g
  "No longer used."
  {:added "1.2"
   :deprecated "1.3"}
  [x & xs]
  `(comment ~x ~@xs))

$ clj-kondo --lint /tmp/foo.clj --config '{:output {:format :edn}, :analysis true}'
| jet --pretty --query ':analysis'

{:namespace-definitions [{:filename "/tmp/foo.clj",
                          :row 1,
                          :col 1,
                          :name foo,
                          :deprecated "1.3",
                          :doc "This is a useful namespace.",
                          :no-doc true,
                          :author "Michiel Borkent"}],
 :namespace-usages [{:filename "/tmp/foo.clj",
                     :row 6,
                     :col 14,
                     :from foo,
                     :to clojure.set,
                     :alias set}],
 :var-definitions [{:filename "/tmp/foo.clj",
                    :row 8,
                    :col 1,
                    :end-row 9,
                    :end-col 11,
                    :ns foo,
                    :name f,
                    :defined-by 'clojure.core/defn-
                    :private true,
                    :fixed-arities #{1}}
                   {:added "1.2",
                    :ns foo,
                    :name g,
                    :filename "/tmp/foo.clj",
                    :defined-by 'clojure.core/defmacro
                    :macro true,
                    :row 11,
                    :col 1,
                    :end-row 16,
                    :end-col 22,
                    :deprecated "1.3",
                    :varargs-min-arity 1,
                    :doc "No longer used."}],
 :var-usages [{:fixed-arities #{1},
               :name inc,
               :filename "/tmp/foo.clj",
               :from foo,
               :col 4,
               :from-var f,
               :arity 1,
               :row 9,
               :to clojure.core}
              {:name defn-,
               :filename "/tmp/foo.clj",
               :from foo,
               :macro true,
               :col 2,
               :arity 3,
               :varargs-min-arity 2,
               :row 8,
               :to clojure.core}
              {:name comment,
               :filename "/tmp/foo.clj",
               :from foo,
               :macro true,
               :col 5,
               :from-var g,
               :varargs-min-arity 0,
               :row 16,
               :to clojure.core}
              {:name defmacro,
               :filename "/tmp/foo.clj",
               :from foo,
               :macro true,
               :col 2,
               :arity 5,
               :varargs-min-arity 2,
               :row 11,
               :to clojure.core}]}

NOTE: breaking changes may occur as result of feedback in the next few weeks (2019-07-30).

Example tools

These are examples of what you can do with the analysis data that clj-kondo provides as a result of linting your sources.

To run the tools on your system you will need the Clojure CLI tool version 1.10.1.466 or higher and then use this repo as a git dep:

{:deps {clj-kondo/tools {:git/url "https://github.com/clj-kondo/clj-kondo"
                         :sha "1ed3b11025b7f3a582e6db099ba10a888fe0fc2c"
                         :deps/root "analysis"}}}

Replace the :sha with the latest SHA of this repo.

You can create an alias for a tool in your ~/.clojure/deps.edn:

{
 :aliases {:unused-vars
           {:extra-deps {clj-kondo/tools {:git/url "https://github.com/clj-kondo/clj-kondo"
                                          :sha "1ed3b11025b7f3a582e6db099ba10a888fe0fc2c"
                                          :deps/root "analysis"}}
            :main-opts ["-m" "clj-kondo.tools.unused-vars"]}
 }
}

and then call it from anywhere in your system with:

$ clj -M:unused-vars src

Unused vars

$ clj -M -m clj-kondo.tools.unused-vars src
The following vars are unused:
clj-kondo.tools.namespace-graph/-main
clj-kondo.tools.unused-vars/-main

A planck port of this example is available in the script directory. You can invoke it like this:

script/unused_vars.cljs src

Private vars

A variation on the above tool, which looks at private vars and reports unused private vars or illegally accessed private vars.

Example code:

(ns foo)

(defn- foo [])
(defn- bar []) ;; unused

(ns bar (:require [foo :as f]))

(f/foo) ;; illegal call

$ clj -M -m clj-kondo.tools.private-vars /tmp/private.clj
/tmp/private.clj:4:8 warning: foo/bar is private but never used
/tmp/private.clj:8:1 warning: foo/foo is private and cannot be accessed from namespace bar

A planck port of this example is available in the script directory. You can invoke it like this:

script/private_vars.cljs /tmp/private.clj

Namespace graph

This example requires GraphViz. Install with e.g. brew install graphviz.

$ clj -M -m clj-kondo.tools.namespace-graph src

Find var

$ clj -M -m clj-kondo.tools.find-var clj-kondo.core/run! src ../src
clj-kondo.core/run! is defined at ../src/clj_kondo/core.clj:51:7
clj-kondo.core/run! is used at ../src/clj_kondo/core.clj:120:12
clj-kondo.core/run! is used at ../src/clj_kondo/main.clj:81:44
clj-kondo.core/run! is used at src/clj_kondo/tools/find_var_usages.clj:8:29
clj-kondo.core/run! is used at src/clj_kondo/tools/namespace_graph.clj:7:29
clj-kondo.core/run! is used at src/clj_kondo/tools/unused_vars.clj:9:31

Popular vars

$ clj -M -m clj-kondo.tools.popular-vars 10 ../src
clojure.core/let: 196
clojure.core/defn: 183
clojure.core/when: 115
clojure.core/=: 86
clojure.core/if: 86
clojure.core/recur: 79
clojure.core/assoc: 70
clojure.core/or: 68
clojure.core/->: 68
clojure.core/first: 62

Missing docstrings

$ clj -M -m clj-kondo.tools.missing-docstrings ../src
clj-kondo.impl.findings/reg-finding!: missing docstring
clj-kondo.impl.findings/reg-findings!: missing docstring
clj-kondo.impl.namespace/reg-var!: missing docstring
clj-kondo.impl.namespace/reg-var-usage!: missing docstring
clj-kondo.impl.namespace/reg-alias!: missing docstring
...

Circular dependencies

Example code:

(ns a (:require b c))

(ns b (:require a)) ;; circular dependency

(ns c (:require a)) ;; circular dependency

$ clj -M -m clj-kondo.tools.circular-dependencies /tmp/circular.clj
/tmp/circular.clj:3:17: circular dependendy from namespace b to a
/tmp/circular.clj:5:17: circular dependendy from namespace c to a

Finding unused and undefined re-frame subscriptions

See this repo.

Also see this gist.

AST

Produce an AST from clj-kondo analysis and rewrite-clj nodes.

Example code:

(defn foo [x] x)
(defn bar [x] (foo x))

$ clj -M -m clj-kondo.tools.ast /tmp/example.clj

{:children
 ({:children
   ({:sexpr defn, :var-usage true}
    {:sexpr foo, :var true}
    {:children ({:sexpr x, :local true})}
    {:sexpr x, :local-usage true})}
  {:children
   ({:sexpr defn, :var-usage true}
    {:sexpr bar, :var true}
    {:children ({:sexpr x, :local true})}
    {:children
     ({:sexpr foo, :var-usage true} {:sexpr x, :local-usage true})})})}

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README.md

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Example tools

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Private vars

Namespace graph

Find var

Popular vars

Missing docstrings

Circular dependencies

Finding unused and undefined re-frame subscriptions

AST

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Directory actions

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analysis

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parent directory

README.md

Analysis data and tools

Extra analysis

Metadata

Context data

Limited analysis

Data

Example tools

Unused vars

Private vars

Namespace graph

Find var

Popular vars

Missing docstrings

Circular dependencies

Finding unused and undefined re-frame subscriptions

AST