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, 0 insertions, 9 deletions

diff --git a/js/plugins.d.ts b/js/plugins.d.ts
deleted file mode 100644
index 842a897de..000000000
--- a/js/plugins.d.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-
-// This allows TypeScript to resolve any modules that end with `!string`
-// as there is a rollup plugin that will take any mids ending with `!string`
-// and return them as a string to rollup for inlining
-declare module "*!string" {
-  const value: string;
-  export default value;
-}