Fix opslang-wasm packaging

devtools-frontend/crates/opslang-wasm/build.rs

@@ -1,26 +1,44 @@
+use std::fs;
 use std::process::Command;
 use std::{env, path::PathBuf};
 
 fn main() {
+    // no build logic on wasm32 build (cargo build called from wasm-pack)
+    let target = env::var("TARGET").unwrap();
+    if target.contains("wasm32") {
+        return;
+    }
+
+    // Just called cargo build (target may be x86_64 or aarch64)
+    // But, now we build wasm by wasm-pack
+
     let out_dir = env::var("OUT_DIR").unwrap();
 
+    // pass dist directory path to dependents crate (via package.links)
+    // it can be used as DEP_OPSLANG_WASM_OUT_DIR in dependents build.rs
     println!("cargo:out_dir={}", out_dir);
 
-    let target = env::var("TARGET").unwrap();
+    // Of course we think we should copy source dir into $OUT_DIR
+    //  & build(wasm-pack build) in $OUT_DIR,
+    //  we can't be happy with cargo-metadata called from wasm-pack build
+    //  (from cargo build only.not from cargo package)
+    let out_dir = PathBuf::from(out_dir);
 
-    if !target.contains("wasm32") {
-        let out_dir = PathBuf::from(out_dir);
+    // Let's go
+    let status = Command::new("wasm-pack")
+        .arg("build")
+        .arg("--weak-refs")
+        .arg("--target")
+        .arg("web")
+        .arg("--release")
+        .arg("--out-dir")
+        .arg(out_dir)
+        .status()
+        .expect("failed to execute wasm-pack");
+    assert!(status.success(), "failed to wasm-pack build");
 
-        let status = Command::new("wasm-pack")
-            .arg("build")
-            .arg("--weak-refs")
-            .arg("--target")
-            .arg("web")
-            .arg("--release")
-            .arg("--out-dir")
-            .arg(out_dir)
-            .status()
-            .expect("failed to execute wasm-pack");
-        assert!(status.success(), "failed to wasm-pack build");
-    }
+    // wasm-pack build (cargo build --target wasm32) generates Cargo.lock
+    // On cargo build, it's fine.
+    // On cargo package, it cause a catastrophe!!! (it can't be exists in source directory)
+    fs::remove_file("Cargo.lock").unwrap_or(());
 }