housekeeping: .js -> .jsx file extensions (via #5014)

* housekeeping: `.js` -> `.jsx` where necessary

src/core/plugins/oas3/helpers.jsx

@@ -0,0 +1,40 @@
+import React from "react"
+
+export function isOAS3(jsSpec) {
+  const oasVersion = jsSpec.get("openapi")
+  if(typeof oasVersion !== "string") {
+    return false
+  }
+
+  // we gate against `3.1` becasue we want to explicitly opt into supporting it
+  // at some point in the future -- KS, 7/2018
+
+  // starts with, but is not `3.0.` exactly
+  return oasVersion.startsWith("3.0.") && oasVersion.length > 4
+}
+
+export function isSwagger2(jsSpec) {
+  const swaggerVersion = jsSpec.get("swagger")
+  if(typeof swaggerVersion !== "string") {
+    return false
+  }
+
+  return swaggerVersion.startsWith("2.0")
+}
+
+export function OAS3ComponentWrapFactory(Component) {
+  return (Ori, system) => (props) => {
+    if(system && system.specSelectors && system.specSelectors.specJson) {
+      const spec = system.specSelectors.specJson()
+
+      if(isOAS3(spec)) {
+        return <Component {...props} {...system} Ori={Ori}></Component>
+      } else {
+        return <Ori {...props}></Ori>
+      }
+    } else {
+      console.warn("OAS3 wrapper: couldn't get spec")
+      return null
+    }
+  }
+}