init

gulpfile.babel.js/util/replaceStrings.js

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+'use strict';
+
+var through2 = require('through2');
+var gutil = require('gulp-util');
+
+var PLUGIN_NAME = 'gulp-replace-task';
+
+// plugin
+
+module.exports = function (opts) {
+
+  return through2.obj(function (file, enc, cb) {
+
+    if (file.isNull()) {
+      this.push(file);
+      return cb();
+    }
+
+    if (file.isStream()) {
+      this.emit('error', new gutil.PluginError(PLUGIN_NAME,
+        'Streaming not supported'));
+      return cb();
+    }
+
+    var options = opts || {};
+    var contents = file.contents.toString();
+
+    for (const [key, value] of Object.entries(opts)) {
+        key = key.replace('[','\\[');
+        key = key.replace(']','\\]');
+        var re = new RegExp(key, 'g');
+        contents = contents.replace(re, value);
+    }
+
+    var result = contents;
+    if (result !== false) {
+      file.contents = new Buffer.from(result);
+    } else {
+      // preserve original file
+    }
+
+    this.push(file);
+    cb();
+
+  });
+
+};