support for RN >= 0.56

Author: Jesús Carrera

package.json

@@ -13,7 +13,7 @@
     "@types/node": "^9.3.0",
     "@types/semver": "^5.4.0",
     "app-root-path": "^2.0.1",
-    "babel-generator": "^6.26.0",
+    "babel-generator": "^6.26.1",
     "javascript-obfuscator": "^0.13.0",
     "jju": "^1.3.0",
     "semver": "^5.4.1",
@@ -30,7 +30,7 @@
   "typings": "dist/index.d.ts",
   "lint-staged": {
     "**/*.ts": [
-      "prettier --list-different --no-semi --trailing-comma all"
+      "prettier --no-semi --trailing-comma all"
     ]
   },
   "devDependencies": {
@@ -39,11 +39,11 @@
     "husky": "^0.13.3",
     "jest": "^22.0.6",
     "lint-staged": "^3.4.1",
-    "metro": "^0.24.3",
-    "metro-bundler": "^0.9.0",
+    "metro": "^0.45.6",
+    "metro-bundler": "^0.22.1",
     "np": "^2.18.3",
     "prettier": "^1.10.2",
-    "react-native": "^0.45.1",
+    "react-native": "^0.57.1",
     "ts-jest": "^22.0.1",
     "ts-node": "^4.1.0",
     "typescript": "^2.6.2"
@@ -66,4 +66,4 @@
       "json"
     ]
   }
-}
+}

src/getMetroTransformer.ts

@@ -44,7 +44,9 @@ function getReactNativeMinorVersion(): number {
 export function getMetroTransformer(
   reactNativeMinorVersion: number = getReactNativeMinorVersion(),
 ): MetroTransformer {
-  if (reactNativeMinorVersion >= 52) {
+  if (reactNativeMinorVersion >= 56) {
+    return require("metro/src/reactNativeTransformer")
+  } else if (reactNativeMinorVersion >= 52) {
     return require("metro/src/transformer")
   } else if (reactNativeMinorVersion >= 0.47) {
     return require("metro-bundler/src/transformer")
@@ -74,20 +76,20 @@ export function maybeTransformMetroResult(
     })
 
     const mapConsumer = new SourceMapConsumer(map as any) // upstream types are wrong
-    ;(traverse as any).cheap(ast, (node: Node) => {
-      if (node.loc) {
-        const originalStart = mapConsumer.originalPositionFor(node.loc.start)
-        if (originalStart.line) {
-          node.loc.start.line = originalStart.line
-          node.loc.start.column = originalStart.column
-        }
-        const originalEnd = mapConsumer.originalPositionFor(node.loc.end)
-        if (originalEnd.line) {
-          node.loc.end.line = originalEnd.line
-          node.loc.end.column = originalEnd.column
+      ; (traverse as any).cheap(ast, (node: Node) => {
+        if (node.loc) {
+          const originalStart = mapConsumer.originalPositionFor(node.loc.start)
+          if (originalStart.line) {
+            node.loc.start.line = originalStart.line
+            node.loc.start.column = originalStart.column
+          }
+          const originalEnd = mapConsumer.originalPositionFor(node.loc.end)
+          if (originalEnd.line) {
+            node.loc.end.line = originalEnd.line
+            node.loc.end.column = originalEnd.column
+          }
         }
-      }
-    })
+      })
 
     return { ast }
   } else if (Array.isArray(upstreamResult.map)) {