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diff --git a/node_modules/bl/node_modules/readable-stream/lib/_stream_passthrough.js b/node_modules/bl/node_modules/readable-stream/lib/_stream_passthrough.js
new file mode 100644
index 000000000..d06f71f18
--- /dev/null
+++ b/node_modules/bl/node_modules/readable-stream/lib/_stream_passthrough.js
@@ -0,0 +1,26 @@
+// a passthrough stream.
+// basically just the most minimal sort of Transform stream.
+// Every written chunk gets output as-is.
+
+'use strict';
+
+module.exports = PassThrough;
+
+var Transform = require('./_stream_transform');
+
+/*<replacement>*/
+var util = require('core-util-is');
+util.inherits = require('inherits');
+/*</replacement>*/
+
+util.inherits(PassThrough, Transform);
+
+function PassThrough(options) {
+  if (!(this instanceof PassThrough)) return new PassThrough(options);
+
+  Transform.call(this, options);
+}
+
+PassThrough.prototype._transform = function (chunk, encoding, cb) {
+  cb(null, chunk);
+};
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