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-rw-r--r--packages/order-watcher/tslint.json3
1 files changed, 3 insertions, 0 deletions
diff --git a/packages/order-watcher/tslint.json b/packages/order-watcher/tslint.json
index ffaefe83a..059573ce7 100644
--- a/packages/order-watcher/tslint.json
+++ b/packages/order-watcher/tslint.json
@@ -1,3 +1,6 @@
{
+ "rules": {
+ "prefer-readonly": true
+ },
"extends": ["@0xproject/tslint-config"]
}