gnu: Add node-string-decoder.

* gnu/packages/node-xyz.scm (node-string-decoder): New variable.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

gnu/packages/node-xyz.scm

@@ -420,6 +420,39 @@ (define-public node-safe-buffer
 @code{Buffer.alloc(SIZE)}) in older versions.")
     (license license:expat)))
 
+(define-public node-string-decoder
+  (package
+    (name "node-string-decoder")
+    (version "1.3.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/nodejs/string_decoder")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "0xxvyya9fl9rlkqwmxzqzbz4rdr3jgw4vf37hff7cgscxkhg266k"))))
+    (build-system node-build-system)
+    (arguments
+     '(#:phases
+       (modify-phases %standard-phases
+         (add-after 'patch-dependencies 'delete-dependencies
+           (lambda args
+             (delete-dependencies
+              '("tap" "core-util-is" "babel-polyfill")))))
+       ;; FIXME: Tests depend on node-tap
+       #:tests? #f))
+    (inputs (list node-safe-buffer node-inherits))
+    (home-page "https://github.com/nodejs/string_decoder")
+    (synopsis "Decode buffers while preserving multi-byte sequences ")
+    (description "This package provides a user-land implementation of
+Node-core's @code{string_decoder}, which serves to decode buffers to
+strings so that the decoded string does not contain incomplete multibyte
+sequences.")
+    (license license:expat)))
+
 (define-public node-irc-colors
   (package
     (name "node-irc-colors")