feat: shrink the wasm (#433)

This patch does a number of things, all in the name of shrinking the
final wasm binary size. The first three are introducing features, two to
change the logging to optional, and one to use a smaller allocator (by
10k).

Additionally, it introduces using some tools to shrink the binary
further by removing more sections that are unneeded. These are used in
`wasm-build.sh`.

Fixes #432

.gitattributes

@@ -0,0 +1 @@
+Cargo.lock binary

Cargo.toml

@@ -8,7 +8,7 @@ description = "LSP support for the flux language"
 repository = "https://github.com/influxdata/flux-lsp"
 
 [package.metadata.wasm-pack.profile.release]
-wasm-opt = ["-Oz", "--enable-mutable-globals"]
+wasm-opt = ["-Oz"]
 
 [profile.release]
 opt-level = "z"
@@ -17,7 +17,6 @@ lto = true
 [features]
 default = []
 strict = []
-wasm_next = []
 
 [lib]
 name = "flux_lsp"
@@ -37,11 +36,11 @@ async-std = { version = "1.11.0", features = ["attributes"] }
 async-trait = "0.1.53"
 clap = { version = "3.1.8", features = ["derive"] }
 combinations = "0.1.0"
-console_error_panic_hook = "0.1.7"
+console_error_panic_hook = { version = "0.1.7", optional = true }
 console_log = { version = "0.2", optional = true }
 env_logger = "0.9"
 expect-test = "1.2.2"
-flux = { git = "https://github.com/influxdata/flux", tag = "v0.162.0", features = ["lsp"] }
+flux = { git = "https://github.com/influxdata/flux", tag = "v0.162.0", features = ["lsp"], default-features = false }
 futures = "0.3.21"
 js-sys = "0.3.56"
 line-col = "0.2.1"
@@ -56,6 +55,7 @@ url = "2.2.2"
 wasm-bindgen = { version = "0.2.79", features = ["serde-serialize"] }
 wasm-bindgen-futures = "0.4.29"
 web-sys = { version = "0.3.56", features = ["console"] }
+wee_alloc = { version = "0.4.5", optional = true }
 
 [dev-dependencies]
 criterion = "0.3"

src/lib.rs

@@ -19,4 +19,8 @@ mod wasm;
 #[macro_use]
 extern crate pretty_assertions;
 
+#[cfg(feature = "wee_alloc")]
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
 pub use server::LspServer;

src/wasm.rs

@@ -81,6 +81,7 @@ pub struct Lsp {
 
 impl Default for Lsp {
     fn default() -> Self {
+        #[cfg(feature = "console_log")]
         console_error_panic_hook::set_once();
 
         let (service, messages) =

wasm-build.sh

@@ -5,14 +5,14 @@ set -e
 BUILD_MODE=${BUILD_MODE-release}
 
 BUILD_FLAG=""
-BUILD_MODE_ARGS=""
+BUILD_MODE_ARGS="--features wee_alloc"
 case $BUILD_MODE in
     "release")
         BUILD_FLAG="--release"
         ;;
     "dev")
         BUILD_FLAG="--dev"
-        BUILD_MODE_ARGS="--features console_log"
+        BUILD_MODE_ARGS="${BUILD_MODE_ARGS},console_log,console_error_panic_hook"
         ;;
     *)
         echo "Invalid build mode: ${BUILD_MODE}"
@@ -40,6 +40,12 @@ wasm-pack build \
     --locked \
     $BUILD_MODE_ARGS
 
+# Strip producers header and some other optional bits.
+wasm-strip pkg-node/flux-lsp-node_bg.wasm
+wasm-opt -Oz -o pkg-node/flux-lsp-node_bg.wasm pkg-node/flux-lsp-node_bg.wasm
+wasm-strip pkg-browser/flux-lsp-browser_bg.wasm
+wasm-opt -Oz -o pkg-browser/flux-lsp-browser_bg.wasm pkg-browser/flux-lsp-browser_bg.wasm
+
 cat pkg-node/package.json | sed s/@influxdata\\/flux-lsp\"/@influxdata\\/flux-lsp-node\"/g > pkg-node/package-new.json
 mv pkg-node/package-new.json pkg-node/package.json