[英]How to use “foreign” JavaScript dependencies in Clojurescript?
I'm trying to wrap my head around using "foreign" JavaScript dependencies in Clojurescript . 我正试图在Clojurescript中使用“外来”JavaScript依赖项 。 I've read most everything Google has to offer on this topic but I still fail to understand this process. 我已经阅读了Google在此主题上提供的大部分内容,但我仍然无法理解这一过程。 In particular, I'm interested how to depend on the jsonld.js library from Clojurescript. 特别是,我对如何依赖Clojurescript的jsonld.js库感兴趣。
Some points I don't get: 我得到的一些观点:
Do you put :foreign-libs
into deps.cljs or compiler options (eg, :compiler
map in project.clj)? 你把:foreign-libs
放到deps.cljs或编译器选项中(例如:compiler
project.clj中的:compiler
映射)?
Is the value of :file
in :foreign-libs
interpreted as a Java resource? 值为:file
:foreign-libs
解释为Java资源? Where do you put the JavaScript files you use as foreign libraries? 你把你用作外国图书馆的JavaScript文件放在哪里? I tried putting them into resources
and elsewhere, but all my attempts resulted in java.lang.NullPointerException
. 我尝试将它们放入resources
和其他地方,但我所有的尝试都导致了java.lang.NullPointerException
。
Steps to reproduce: 重现步骤:
# Create an empty Clojurescript project
lein new figwheel jsonld
# Download jsonld.js library
cd jsonld/resources
curl -O http://cdnjs.cloudflare.com/ajax/libs/jsonld/0.3.15/jsonld.js
# Configure foreign libs in project.clj.
# Add the following into `:compiler` in the dev build:
# :foreign-libs {:file "resources/jsonld.js"
# :provides ["jsonld"]}
lein figwheel # => java.lang.NullPointerException
Alternatively, if I provide deps.cljs
with the following content: 或者,如果我向deps.cljs
提供以下内容:
{:foreign-libs {:file "jsonld.js"
:provides ["jsonld"]}}
Then Figwheel starts, but when I call (require '[jsonld])
, I get this error: 然后Figwheel开始,但是当我调用(require '[jsonld])
,我收到此错误:
WARNING: JavaScript file found on classpath for library `jsonld`, but does not contain a corresponding `goog.provide` declaration
clojure.lang.ExceptionInfo: No such namespace: jsonld, could not locate jsonld.cljs, jsonld.cljc, or Closure namespace "jsonld" {:tag :cljs/analysis-error}
Update: The :foreign-libs
option takes a vector of foreign libs and not a single map. 更新:: :foreign-libs
选项采用外部库的向量而不是单个映射。
The :foreign-libs
option can either be supplied to the compiler directly or via a deps.cljs
file within jars. :foreign-libs
选项可以直接提供给编译器,也可以通过jar中的deps.cljs
文件提供。 deps.cljs
is mostly useful when you want to package a Javascript library within a jar that other people may use — maybe useful later but not what you need right now. 当你想在其他人可能使用的jar中打包Javascript库时, deps.cljs
非常有用 - 可能会在以后使用,但现在不需要。
You can find more information about the compiler option in the wiki . 您可以在Wiki中找到有关编译器选项的更多信息。 There also is a page specifically about using/packaging foreign dependencies in ClojureScript . 还有一个专门关于在ClojureScript中使用/打包外部依赖项的页面 。
I think in your particular example the problem is the path you're supplying as :file
. 我认为在您的特定示例中,问题是您提供的路径为:file
。 The path is classpath-relative and the contents of the resources/
directory are added to the classpath, meaning if you want to point to resources/jsonld.js
in a classpath-relative way it's just jsonld.js
. 路径是类路径相关的, resources/
目录的内容被添加到类路径中,这意味着如果你想以类路径相对的方式指向resources/jsonld.js
它只是jsonld.js
。
PS: You can also supply URLs as :file
and the compiler will download them for you. PS:您还可以将URL提供为:file
,编译器将为您下载它们。
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