Sqldiff WASM

README.md

@@ -1,8 +1,8 @@
 # wa-sqlite-build-env
 
-Build environment for [livestorejs/wa-sqlite](https://github.com/livestorejs/wa-sqlite). 
+Build environment for [livestorejs/wa-sqlite](https://github.com/livestorejs/wa-sqlite) and SQLite utilities.
 
-## Build
+## Build wa-sqlite
 
 ```sh
 cp -r wa-sqlite wa-sqlite-local
@@ -18,6 +18,29 @@ nix develop '.?submodules=1' --print-build-logs
 
 NOTE: `.?submodules=1` is required since `wa-sqlite` is a submodule.
 
+## Build sqldiff WASM
+
+Build a WebAssembly version of SQLite's `sqldiff` utility with JavaScript bindings:
+
+```sh
+nix run .#build-sqldiff
+```
+
+This creates `sqldiff-wasm/dist/` with:
+- `sqldiff.mjs` - ES6 module with WASM loader
+- `sqldiff.wasm` - WebAssembly binary
+- `README.md` - Usage instructions
+
+### Testing sqldiff WASM
+
+Run the comprehensive test suite:
+
+```sh
+node test-sqldiff-comprehensive.js
+```
+
+This tests all sqldiff features including basic diff, summary, schema-only, table-specific diffs, transaction wrapping, and help.
+
 ## Publish
 
 ```sh

flake.nix

@@ -27,6 +27,11 @@
             waSQLiteSrc = "${self}/wa-sqlite";
           };
 
+          # Build WASM version of sqldiff with JS bindings
+          sqldiff-wasm = pkgs.callPackage ./nix/sqldiff-wasm.nix { 
+            inherit pkgsUnstable; 
+          };
+
           # wa-sqlite-livestore-esm = pkgs.callPackage ./packages/sqlite/nix/default.nix {
           #   wa-sqlite-livestore = self.packages.${system}.wa-sqlite-livestore;
           # };
@@ -59,6 +64,25 @@
               echo "✓ wa-sqlite build complete"
             '');
           };
+
+          build-sqldiff = {
+            type = "app";
+            program = toString (pkgs.writeShellScript "build-sqldiff" ''
+              set -euo pipefail
+
+              echo "Building sqldiff-wasm..."
+
+              pkg=$(nix build --no-link --print-out-paths .#sqldiff-wasm)
+
+              # Setup/update dist directory
+              mkdir -p sqldiff-wasm
+              rm -rf sqldiff-wasm/dist
+              echo "Copying built package from $pkg..."
+              cp -rf "$pkg/dist" sqldiff-wasm/dist
+              chmod -R u+w sqldiff-wasm/dist
+              echo "✓ sqldiff-wasm build complete"
+            '');
+          };
         };
 
         # Clean devShell without problematic interpolations
@@ -77,6 +101,7 @@
             echo ""
             echo "Available commands:"
             echo "  nix run .#build-wa-sqlite    - Build wa-sqlite"
+            echo "  nix run .#build-sqldiff      - Build sqldiff-wasm"
           '';
 
         };

nix/sqldiff-wasm.nix

@@ -0,0 +1,128 @@
+{ lib, stdenv, fetchFromGitHub, fetchurl, pkgs, pkgsUnstable }:
+
+stdenv.mkDerivation rec {
+  pname = "sqldiff-wasm";
+  version = "3.47.0";
+
+  src = fetchFromGitHub {
+    owner = "sqlite";
+    repo = "sqlite";
+    rev = "f5fb820c0f4781337faf02ed871be68d13a83d94";
+    sha256 = "sha256-35xrRPgoj92rji9EAyCHvhMP/NEz9hffOMJyhSKCCZ8=";
+    name = "sqlite-src";
+  };
+
+  # Disable the automatic update of GNU config scripts
+  dontUpdateAutotoolsGnuConfigScripts = true;
+
+  nativeBuildInputs = [
+    pkgs.which # needed for Make file
+    pkgs.tcl
+    pkgs.gcc
+    pkgs.wabt
+    pkgsUnstable.emscripten
+    pkgs.unzip
+    pkgs.openssl
+    pkgs.zip
+  ];
+
+  configurePhase = ''
+    echo "Emscripten version:"
+    emcc --version
+
+    pwd
+    ls -la
+
+    # Configure SQLite with all features enabled
+    ./configure --enable-all
+
+    # Make sqlite3.c amalgamation
+    make sqlite3.c
+
+    # Copy sqldiff.c from tool directory for building
+    cp tool/sqldiff.c .
+
+    # Copy required header files from ext/misc directory
+    cp ext/misc/sqlite3_stdio.h .
+  '';
+
+  buildPhase = ''
+    # Needed for `make`
+    export DESTDIR="$PWD"
+    export HOME="$PWD"
+
+    mkdir -p cache/emscripten
+    export EM_CACHE="$PWD/cache/emscripten"
+
+    # Ensure dist directory exists and has correct permissions
+    mkdir -p dist
+    chmod 755 dist
+
+    # Build WASM version of sqldiff
+    emcc -O2 \
+      -s WASM=1 \
+      -s ALLOW_MEMORY_GROWTH=1 \
+      -s ENVIRONMENT="web,worker,node" \
+      -s INVOKE_RUN=0 \
+      -s MODULARIZE=1 \
+      -s EXPORT_ES6=1 \
+      -s EXPORT_NAME="createSqlDiffModule" \
+      -s EXPORTED_FUNCTIONS='["_main", "_malloc", "_free"]' \
+      -s EXPORTED_RUNTIME_METHODS='["callMain", "FS", "PROXYFS", "MEMFS", "ccall", "cwrap"]' \
+      -s STACK_SIZE=512KB \
+      -s WASM_BIGINT=0 \
+      -DSQLITE_ENABLE_BYTECODE_VTAB \
+      -DSQLITE_ENABLE_SESSION \
+      -DSQLITE_ENABLE_PREUPDATE_HOOK \
+      sqldiff.c sqlite3.c \
+      -o dist/sqldiff.mjs
+
+    # Create a README with usage instructions
+    cat > dist/README.md << 'EOF'
+# SqlDiff WASM
+
+This package contains a WebAssembly build of SQLite's sqldiff utility.
+
+## Files
+
+- `sqldiff.mjs` - The main WASM module
+- `sqldiff.wasm` - The WebAssembly binary
+
+## Usage
+
+```javascript
+import createSqlDiffModule from './sqldiff.mjs';
+
+async function main() {
+  const module = await createSqlDiffModule();
+
+  // Write test databases to virtual filesystem
+  module.FS.writeFile('/db1.sqlite', db1Bytes);
+  module.FS.writeFile('/db2.sqlite', db2Bytes);
+
+  // Run sqldiff
+  const result = module.callMain(['sqldiff', '/db1.sqlite', '/db2.sqlite']);
+
+  console.log('Exit code:', result);
+}
+
+main();
+```
+
+## Command Line Options
+
+The WASM version supports the same options as the native sqldiff:
+
+- `--changeset FILE` - Write binary changeset to FILE
+- `--schema` - Show only schema differences  
+- `--summary` - Show summary of changes
+- `--table TABLE` - Show differences for specific table
+- `--transaction` - Wrap output in transaction
+- `--vtab` - Handle virtual tables
+EOF
+  '';
+
+  installPhase = ''
+    cp -r . $out
+  '';
+} 

package.json

@@ -1,6 +1,7 @@
 {
   "private": true,
   "version": "0.0.0",
+  "type": "module",
   "packageManager": "[email protected]",
   "devDependencies": {},
   "scripts": {}