chore(gatsby): Convert develop-static to TypeScript (#22106)

packages/gatsby/src/commands/develop-static.ts

@@ -0,0 +1,27 @@
+import sysPath from "path"
+import express from "express"
+import { ServeStaticOptions } from "serve-static"
+import parseUrl from "parseurl"
+
+export function developStatic(
+  root: string,
+  options: ServeStaticOptions
+): express.Handler {
+  const expressStatic = express.static(root, options)
+
+  return function(
+    req: express.Request,
+    res: express.Response,
+    next: express.NextFunction
+  ): typeof expressStatic | void {
+    if ([`GET`, `HEAD`].includes(req.method)) {
+      const path = parseUrl(req).pathname
+      const parsedPath = sysPath.parse(path)
+      if ([`.htm`, `.html`].includes(parsedPath.ext)) {
+        return next()
+      }
+    }
+
+    return expressStatic(req, res, next)
+  }
+}

packages/gatsby/src/commands/develop.ts

@@ -33,7 +33,7 @@ import https from "https"
 
 import bootstrapSchemaHotReloader from "../bootstrap/schema-hot-reloader"
 import bootstrapPageHotReloader from "../bootstrap/page-hot-reloader"
-import developStatic from "./develop-static"
+import { developStatic } from "./develop-static"
 import withResolverContext from "../schema/context"
 import sourceNodes from "../utils/source-nodes"
 import createSchemaCustomization from "../utils/create-schema-customization"