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, 44 deletions

diff --git a/core/snapshot_creator.rs b/core/snapshot_creator.rs
deleted file mode 100644
index 1d43b9174..000000000
--- a/core/snapshot_creator.rs
+++ /dev/null
@@ -1,44 +0,0 @@
-// Note: This is a nearly identical rewrite of core/libdeno/snapshot_creator.cc
-// but in Rust.
-//
-// This snapshot program is considered "basic" because the code being
-// snapshotted cannot call ops.
-
-extern crate deno;
-
-use deno::js_check;
-use deno::Isolate;
-use deno::StartupData;
-use std::env;
-use std::io::Write;
-
-fn main() {
-  let args: Vec<String> = env::args().collect();
-  // NOTE: `--help` arg will display V8 help and exit
-  let args = deno::v8_set_flags(args);
-
-  let (snapshot_out_bin, js_filename) = if args.len() == 3 {
-    (args[1].clone(), args[2].clone())
-  } else {
-    eprintln!("Usage: snapshot_creator <out_filename> <js_filename>");
-    std::process::exit(1);
-  };
-
-  let js_source =
-    std::fs::read(&js_filename).expect("couldn't read js_filename");
-  let js_source_str = std::str::from_utf8(&js_source).unwrap();
-
-  let will_snapshot = true;
-  let mut isolate = Isolate::new(StartupData::None, will_snapshot);
-
-  js_check(isolate.execute(&js_filename, js_source_str));
-
-  let snapshot = isolate.snapshot().expect("error snapshotting");
-
-  let mut out_file = std::fs::File::create(snapshot_out_bin).unwrap();
-  let snapshot_slice =
-    unsafe { std::slice::from_raw_parts(snapshot.data_ptr, snapshot.data_len) };
-  out_file
-    .write_all(snapshot_slice)
-    .expect("Failed to write snapshot file");
-}