Update for Babel 8

packages/babel-plugin-transform-spread/src/index.js

@@ -50,7 +50,11 @@ export default declare((api, options) => {
 
         if (t.isArrayExpression(spreadLiteral) && hasHole(spreadLiteral)) {
           spreadLiteral = t.callExpression(
-            file.addHelper("arrayWithoutHoles"),
+            file.addHelper(
+              process.env.BABEL_8_BREAKING
+                ? "arrayWithoutHoles"
+                : "arrayLikeToArray",
+            ),
             [spreadLiteral],
           );
         }

packages/babel-plugin-transform-spread/test/fixtures/spread/nested-array-with-hole-babel-7/exec.js

@@ -0,0 +1,2 @@
+let arr = ['a', ...['b',,'c']];
+expect(2 in arr).toBe(true);

packages/babel-plugin-transform-spread/test/fixtures/spread/nested-array-with-hole-babel-7/input.js

@@ -0,0 +1,2 @@
+var a = [...['a',, 'b']];
+var b = ['a', ...['b',, 'c']];

packages/babel-plugin-transform-spread/test/fixtures/spread/nested-array-with-hole-babel-7/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": false
+}

packages/babel-plugin-transform-spread/test/fixtures/spread/nested-array-with-hole-babel-7/output.js

@@ -0,0 +1,2 @@
+var a = babelHelpers.arrayWithoutHoles(['a',, 'b']);
+var b = ['a'].concat(babelHelpers.arrayWithoutHoles(['b',, 'c']));

packages/babel-plugin-transform-spread/test/fixtures/spread/nested-array-with-hole/options.json

@@ -0,0 +1,3 @@
+{
+  "BABEL_8_BREAKING": true
+}

packages/babel-plugin-transform-spread/test/fixtures/spread/nested-array-with-hole/output.js

@@ -1,2 +1,2 @@
-var a = babelHelpers.arrayWithoutHoles(['a',, 'b']);
-var b = ['a'].concat(babelHelpers.arrayWithoutHoles(['b',, 'c']));
+var a = babelHelpers.arrayLikeToArray(['a',, 'b']);
+var b = ['a'].concat(babelHelpers.arrayLikeToArray(['b',, 'c']));