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, 24 insertions, 0 deletions

diff --git a/cli_snapshots/build.rs b/cli_snapshots/build.rs
new file mode 100644
index 000000000..cffa3d6b3
--- /dev/null
+++ b/cli_snapshots/build.rs
@@ -0,0 +1,24 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+  // To debug snapshot issues uncomment:
+  // deno_typescript::trace_serializer();
+
+  let c = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap());
+  let o = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+  let js_dir = c.join("../js");
+
+  let root_names = vec![js_dir.join("main.ts")];
+  let bundle = o.join("CLI_SNAPSHOT.js");
+  let state = deno_typescript::compile_bundle(&bundle, root_names).unwrap();
+  assert!(bundle.exists());
+  deno_typescript::mksnapshot_bundle(&bundle, state).unwrap();
+
+  let root_names = vec![js_dir.join("compiler.ts")];
+  let bundle = o.join("COMPILER_SNAPSHOT.js");
+  let state = deno_typescript::compile_bundle(&bundle, root_names).unwrap();
+  assert!(bundle.exists());
+  deno_typescript::mksnapshot_bundle_ts(&bundle, state).unwrap();
+}