refactor(gulp): gulpPrefixerにファイルを分離

Author: azu

Diff for: src/gulp/gulp-prefixer.js

@@ -0,0 +1,38 @@
+"use strict";
+import {Transform} from "stream";
+let prefixBuffer = function (buffer, prefix) {
+    return Buffer.concat([Buffer(prefix), buffer]);
+};
+
+let prefixStream = function (prefix) {
+    return new Transform({
+        transform: function (chunk, encoding, next) {
+            let buffer = prefixBuffer(chunk, prefix);
+            this.push(buffer);
+            next();
+        }
+    });
+};
+
+let gulpTransform = function (prefix) {
+    // enable `objectMode` of the stream for vinyl File objects.
+    return new Transform({
+        // Takes in vinyl File objects
+        writableObjectMode: true,
+        // Outputs vinyl File objects
+        readableObjectMode: true,
+        transform: function (file, encoding, next) {
+            if (file.isBuffer()) {
+                file.contents = prefixBuffer(file.contents, prefix);
+            }
+
+            if (file.isStream()) {
+                file.contents = file.contents.pipe(prefixStream(prefix));
+            }
+            this.push(file);
+            next();
+        }
+    });
+};
+
+export default gulpTransform;

Diff for: src/gulp/gulpfile.babel.js

@@ -1,45 +1,10 @@
 // LICENSE : MIT
 "use strict";
 import gulp from "gulp";
-import {Transform} from "stream";
-
-let prefixBuffer = function (buffer, prefix) {
-    return Buffer.concat([Buffer(prefix), buffer]);
-};
-
-let prefixStream = function (prefix) {
-    return new Transform({
-        transform: function (chunk, encoding, next) {
-            let buffer = prefixBuffer(chunk, prefix);
-            this.push(buffer);
-            next();
-        }
-    });
-};
-
-let gulpTransform = function (prefix) {
-    // enable `objectMode` of the stream for vinyl File objects.
-    return new Transform({
-        // Takes in vinyl File objects
-        writableObjectMode: true,
-        // Outputs vinyl File objects
-        readableObjectMode: true,
-        transform: function (file, encoding, next) {
-            if (file.isBuffer()) {
-                file.contents = prefixBuffer(file.contents, prefix);
-            }
-
-            if (file.isStream()) {
-                file.contents = file.contents.pipe(prefixStream(prefix));
-            }
-            this.push(file);
-            next();
-        }
-    });
-};
+import gulpPrefixer from "./gulp-prefixer";
 gulp.task("default", function () {
     return gulp.src("./*.*")
-        .pipe(gulpTransform("prefix text"))
+        .pipe(gulpPrefixer("prefix text"))
         .pipe(gulp.dest("build"))
         .on("error", (error) => {
             console.error(error);