3 files changed, 43 insertions, 4 deletions
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 15a82b5eb..7fd34e2f1 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -33,6 +33,7 @@ deno_websocket = { version = "0.36.0", path = "../ext/websocket" }
 deno_webstorage = { version = "0.26.0", path = "../ext/webstorage" }
 regex = "=1.5.4"
 serde = { version = "=1.0.133", features = ["derive"] }
+zstd = '=0.9.2'
 
 [target.'cfg(windows)'.build-dependencies]
 winapi = "=0.3.9"
@@ -85,6 +86,7 @@ text_lines = "=0.4.1"
 tokio = { version = "=1.14", features = ["full"] }
 uuid = { version = "=0.8.2", features = ["v4", "serde"] }
 walkdir = "=2.3.2"
+zstd = '=0.9.2'
 
 [target.'cfg(windows)'.dependencies]
 fwdansi = "=1.1.0"
diff --git a/cli/build.rs b/cli/build.rs
index 48c55e628..87c688480 100644
--- a/cli/build.rs
+++ b/cli/build.rs
@@ -38,7 +38,30 @@ fn create_snapshot(
   let snapshot = js_runtime.snapshot();
   let snapshot_slice: &[u8] = &*snapshot;
   println!("Snapshot size: {}", snapshot_slice.len());
-  std::fs::write(&snapshot_path, snapshot_slice).unwrap();
+
+  let compressed_snapshot_with_size = {
+    let mut vec = vec![];
+
+    vec.extend_from_slice(
+      &u32::try_from(snapshot.len())
+        .expect("snapshot larger than 4gb")
+        .to_le_bytes(),
+    );
+
+    vec.extend_from_slice(
+      &zstd::block::compress(snapshot_slice, 22)
+        .expect("snapshot compression failed"),
+    );
+
+    vec
+  };
+
+  println!(
+    "Snapshot compressed size: {}",
+    compressed_snapshot_with_size.len()
+  );
+
+  std::fs::write(&snapshot_path, compressed_snapshot_with_size).unwrap();
   println!("Snapshot written to: {} ", snapshot_path.display());
 }
 
diff --git a/cli/tsc.rs b/cli/tsc.rs
index 3dfb97588..a2265e36f 100644
--- a/cli/tsc.rs
+++ b/cli/tsc.rs
@@ -51,11 +51,25 @@ pub static SHARED_GLOBALS_LIB: &str =
 pub static WINDOW_LIB: &str = include_str!("dts/lib.deno.window.d.ts");
 pub static UNSTABLE_NS_LIB: &str = include_str!("dts/lib.deno.unstable.d.ts");
 
-pub static COMPILER_SNAPSHOT: &[u8] =
-  include_bytes!(concat!(env!("OUT_DIR"), "/COMPILER_SNAPSHOT.bin"));
+pub static COMPILER_SNAPSHOT: Lazy<Box<[u8]>> = Lazy::new(
+  #[cold]
+  #[inline(never)]
+  || {
+    static COMPRESSED_COMPILER_SNAPSHOT: &[u8] =
+      include_bytes!(concat!(env!("OUT_DIR"), "/COMPILER_SNAPSHOT.bin"));
+
+    zstd::block::decompress(
+      &COMPRESSED_COMPILER_SNAPSHOT[4..],
+      u32::from_le_bytes(COMPRESSED_COMPILER_SNAPSHOT[0..4].try_into().unwrap())
+        as usize,
+    )
+    .unwrap()
+    .into_boxed_slice()
+  },
+);
 
 pub fn compiler_snapshot() -> Snapshot {
-  Snapshot::Static(COMPILER_SNAPSHOT)
+  Snapshot::Static(&*COMPILER_SNAPSHOT)
 }
 
 macro_rules! inc {