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-rw-r--r--lib/_stream_passthrough.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/_stream_passthrough.js b/lib/_stream_passthrough.js
index a5e986430d..ae83d5d4a8 100644
--- a/lib/_stream_passthrough.js
+++ b/lib/_stream_passthrough.js
@@ -23,6 +23,8 @@
// 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');