1 files changed, 35 insertions, 0 deletions
diff --git a/history/es/warnAboutDeprecatedESMImport.js b/history/es/warnAboutDeprecatedESMImport.js
new file mode 100644
index 0000000..8215fb2
--- /dev/null
+++ b/history/es/warnAboutDeprecatedESMImport.js
@@ -0,0 +1,35 @@
+'use strict';
+
+var printWarning = function() {};
+
+if (process.env.NODE_ENV !== 'production') {
+  printWarning = function(format, subs) {
+    var index = 0;
+    var message =
+      'Warning: ' +
+      (subs.length > 0
+        ? format.replace(/%s/g, function() {
+            return subs[index++];
+          })
+        : format);
+
+    if (typeof console !== 'undefined') {
+      console.error(message);
+    }
+
+    try {
+      // --- Welcome to debugging history ---
+      // This error was thrown as a convenience so that you can use the
+      // stack trace to find the callsite that triggered this warning.
+      throw new Error(message);
+    } catch (e) {}
+  };
+}
+
+export default function(member) {
+  printWarning(
+    'Please use `import { %s } from "history"` instead of `import %s from "history/es/%s"`. ' +
+      'Support for the latter will be removed in the next major release.',
+    [member, member]
+  );
+}