metro-babel-transformer - npm Package Compare versions

Comparing version 0.73.7 to 0.74.0

package.json

 {
   "name": "metro-babel-transformer",
-  "version": "0.73.7",
+  "version": "0.74.0",
   "description": "🚇 Base Babel transformer for Metro.",
@@ -22,5 +22,5 @@ "main": "src/index.js",
     "hermes-parser": "0.8.0",
-    "metro-source-map": "0.73.7",
+    "metro-source-map": "0.74.0",
     "nullthrows": "^1.1.1"
   }
 }

src/index.js

@@ -36,2 +36,7 @@ /**
       sourceType: "module",
+      // NOTE(EvanBacon): We split the parse/transform steps up to accommodate
+      // Hermes parsing, but this defaults to cloning the AST which increases
+      // the transformation time by a fair amount.
+      // You get this behavior by default when using Babel's `transform` method directly.
+      cloneInputAst: false,
     };
@@ -44,6 +49,9 @@ const sourceAst = options.hermesParser
       : parseSync(src, babelConfig);
-    const { ast } = transformFromAstSync(sourceAst, src, babelConfig);
+
+    // Generate the function map before we transform the AST to
+    // ensure we aren't reading from mutated AST.
     const functionMap = generateFunctionMap(sourceAst, {
       filename,
     });
+    const { ast } = transformFromAstSync(sourceAst, src, babelConfig);
     return {
@@ -50,0 +58,0 @@ ast: nullthrows(ast),

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Improved metrics

Total package byte prevSize

5729

increased by18.22%

Lines of code

64

increased by12.28%

Dependency changes

• + Addedmetro-source-map@0.74.0(transitive)

• + Addedmetro-symbolicate@0.74.0(transitive)

• + Addedob1@0.74.0(transitive)

• - Removedmetro-source-map@0.73.7(transitive)

• - Removedmetro-symbolicate@0.73.7(transitive)

• - Removedob1@0.73.7(transitive)

• Updatedmetro-source-map@0.74.0