Refactor snapshot build (#2825)

Instead of using core/snapshot_creator.rs, instead two crates are
introduced which allow building the snapshot during build.rs.

Rollup is removed and replaced with our own bundler. This removes
the Node build dependency. Modules in //js now use Deno-style imports
with file extensions, rather than Node style extensionless imports.

This improves incremental build time when changes are made to //js files
by about 40 seconds.

1 files changed, 4 insertions, 4 deletions

diff --git a/js/location.ts b/js/location.ts
index 535a2bcea..d495f99ca 100644
--- a/js/location.ts
+++ b/js/location.ts
@@ -1,8 +1,8 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-import { URL } from "./url";
-import { notImplemented } from "./util";
-import { Location } from "./dom_types";
-import { window } from "./window";
+import { URL } from "./url.ts";
+import { notImplemented } from "./util.ts";
+import { Location } from "./dom_types.ts";
+import { window } from "./window.ts";
 
 export class LocationImpl implements Location {
   constructor(url: string) {