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/xeval.ts b/js/xeval.ts
index fa706ae20..2ef90ce29 100644
--- a/js/xeval.ts
+++ b/js/xeval.ts
@@ -1,7 +1,7 @@
-import { Buffer, writeAll } from "./buffer";
-import { stdin } from "./files";
-import { TextEncoder, TextDecoder } from "./text_encoding";
-import { Reader, EOF } from "./io";
+import { Buffer, writeAll } from "./buffer.ts";
+import { stdin } from "./files.ts";
+import { TextEncoder, TextDecoder } from "./text_encoding.ts";
+import { Reader, EOF } from "./io.ts";
 
 export type XevalFunc = (v: string) => void;