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, 10 insertions, 8 deletions

diff --git a/js/repl.ts b/js/repl.ts
index 08a4fb210..966e809e8 100644
--- a/js/repl.ts
+++ b/js/repl.ts
@@ -1,12 +1,14 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-import { close } from "./files";
-import { exit } from "./os";
-import { window } from "./window";
-import { core } from "./core";
-import { formatError } from "./format_error";
-import { stringifyArgs } from "./console";
-import * as dispatch from "./dispatch";
-import { sendSync, sendAsync } from "./dispatch_json";
+import { close } from "./files.ts";
+import { exit } from "./os.ts";
+import { window } from "./window.ts";
+import { core } from "./core.ts";
+import { formatError } from "./format_error.ts";
+import { stringifyArgs } from "./console.ts";
+import * as dispatch from "./dispatch.ts";
+import { sendSync, sendAsync } from "./dispatch_json.ts";
+
+const { console } = window;
 
 /**
  * REPL logging.