我使用 Figwheel 和 Node，并注意到了时标源映射的一个问题。当设置 {{:source-map-timestamp}} 编译器标志时，{{sourceMappingURL}} 被设置为 {{source.js.map?timestamp}}。
在浏览器中这正常工作，但在从文件系统中加载文件的 Node 中会中断。看起来一个简单的解决方案是检查 {{:target}} 是否为 {{:node}} 并输出类似 {{source.js.timestamp.map}} 的内容，并直接将其用作 {{sourceMappingURL}} 的值。
我在本地对 cljs.compiler/emit-source-map 做了一些更改，允许在使用时标时在 Node 上解析源映射。
{code:title=emit-source-map}
(defn emit-source-map [src dest sm-data opts]
(let [timestamp (System/currentTimeMillis)
filename (str (.getPath ^File dest)
(when (and
(true? (:source-map-timestamp opts))
(= (:target opts) :nodejs))
(str "." timestamp))
".map")
sm-file (io/file filename)]
(if-let [smap (:source-map-asset-path opts)]
(emits "\n//# sourceMappingURL=" smap
(string/replace (util/path sm-file)
(str (util/path (io/file (:output-dir opts))))
"")
(if (and (true? (:source-map-timestamp opts))
(not= (:target opts) :nodejs))
(str
(if-not (string/index-of smap "?") "?" "&")
"rel=" timestamp)
""))
(emits "\n//# sourceMappingURL="
(or (:source-map-url opts) (.getName sm-file))
(if (and (true? (:source-map-timestamp opts))
(not= (:target opts) :nodejs))
(str "?rel=" timestamp)
"")))
(spit sm-file
（sm/encode {(url-path src) (:source-map sm-data)}
{:lines (+ (:gen-line sm-data) 2)}
:file (url-path dest)}
:source-map-path (:source-map-path opts)
:source-map-timestamp (:source-map-timestamp opts)
:source-map-pretty-print (:source-map-pretty-print opts)
:relpaths {(util/path src)}
/(util/ns->relpath (first (:provides opts)) (:ext opts)))
