1 files changed, 31 insertions, 0 deletions
diff --git a/packages/website/ts/pages/documentation/custom_enum.tsx b/packages/website/ts/pages/documentation/custom_enum.tsx
new file mode 100644
index 000000000..aca8af832
--- /dev/null
+++ b/packages/website/ts/pages/documentation/custom_enum.tsx
@@ -0,0 +1,31 @@
+import * as _ from 'lodash';
+import * as React from 'react';
+import {utils} from 'ts/utils/utils';
+import {CustomType} from 'ts/types';
+
+const STRING_ENUM_CODE_PREFIX = ' strEnum(';
+
+interface CustomEnumProps {
+    type: CustomType;
+}
+
+// This component renders custom string enums that was a work-around for versions of
+// TypeScript <2.4.0 that did not support them natively. We keep it around to support
+// older versions of 0x.js <0.9.0
+export function CustomEnum(props: CustomEnumProps) {
+    const type = props.type;
+    if (!_.startsWith(type.defaultValue, STRING_ENUM_CODE_PREFIX)) {
+        utils.consoleLog('We do not yet support `Variable` types that are not strEnums');
+        return null;
+    }
+    // Remove the prefix and postfix, leaving only the strEnum values without quotes.
+    const enumValues = type.defaultValue.slice(10, -3).replace(/'/g, '');
+    return (
+        <span>
+            {`{`}
+                {'\t'}{enumValues}
+                <br />
+            {`}`}
+        </span>
+    );
+}