Add "allowArrayLike" opt to destructuring and spread transforms (#11265)

packages/babel-plugin-transform-destructuring/test/fixtures/allowArrayLike/holes/exec.js

@@ -0,0 +1,6 @@
+var o = { 0: "a", 2: "c", length: 3 };
+
+var [...rest] = o;
+
+expect(rest).toEqual(["a", undefined, "c"]);
+expect(1 in rest).toBe(true); // Not holey

packages/babel-plugin-transform-destructuring/test/fixtures/allowArrayLike/holes/options.json

@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    ["external-helpers", { "helperVersion": "7.100.0" }],
+    ["transform-destructuring", { "allowArrayLike": true }]
+  ]
+}

packages/babel-plugin-transform-destructuring/test/fixtures/allowArrayLike/length-cropped/exec.js

@@ -0,0 +1,6 @@
+var o = { 0: "a", 1: "b", 2: "c", length: 2 };
+
+var [first, ...rest] = o;
+
+expect(first).toBe("a");
+expect(rest).toEqual(["b"]);

packages/babel-plugin-transform-destructuring/test/fixtures/allowArrayLike/length-cropped/options.json

@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    ["external-helpers", { "helperVersion": "7.100.0" }],
+    ["transform-destructuring", { "allowArrayLike": true }]
+  ]
+}

packages/babel-plugin-transform-destructuring/test/fixtures/allowArrayLike/simple/exec.js

@@ -0,0 +1,6 @@
+var o = { 0: "a", 1: "b", 2: "c", length: 3 };
+
+var [first, ...rest] = o;
+
+expect(first).toBe("a");
+expect(rest).toEqual(["b", "c"]);

packages/babel-plugin-transform-destructuring/test/fixtures/allowArrayLike/simple/input.js

@@ -0,0 +1 @@
+var [first, ...rest] = o;

packages/babel-plugin-transform-destructuring/test/fixtures/allowArrayLike/simple/options.json

@@ -0,0 +1,6 @@
+{
+  "plugins": [
+    ["external-helpers", { "helperVersion": "7.100.0" }],
+    ["transform-destructuring", { "allowArrayLike": true }]
+  ]
+}

packages/babel-plugin-transform-destructuring/test/fixtures/allowArrayLike/simple/output.js

@@ -0,0 +1,4 @@
+var _o = o,
+    _o2 = babelHelpers.maybeArrayLike(babelHelpers.toArray, _o),
+    first = _o2[0],
+    rest = _o2.slice(1);