Do not treat break labels as identifiers (#2776)

* Do not treat break labels as identifiers

* Update is-reference to npm version

package.json

@@ -59,7 +59,7 @@
   "homepage": "https://github.com/rollup/rollup",
   "dependencies": {
     "@types/estree": "0.0.39",
-    "@types/node": "^11.11.5",
+    "@types/node": "^11.11.6",
     "acorn": "^6.1.1"
   },
   "devDependencies": {
@@ -74,7 +74,7 @@
     "acorn-walk": "^6.1.1",
     "ansi-escapes": "^4.0.1",
     "buble": "^0.19.7",
-    "chokidar": "^2.1.2",
+    "chokidar": "^2.1.5",
     "console-group": "^0.3.3",
     "date-time": "^3.0.0",
     "eslint": "^5.15.3",
@@ -84,12 +84,12 @@
     "hash.js": "^1.1.7",
     "husky": "^1.3.1",
     "immutable": "^4.0.0-rc.12",
-    "is-reference": "^1.1.1",
+    "is-reference": "^1.1.2",
     "istanbul": "^0.4.5",
     "lint-staged": "^8.1.5",
     "locate-character": "^2.0.5",
     "magic-string": "^0.25.2",
-    "markdownlint-cli": "^0.14.0",
+    "markdownlint-cli": "^0.14.1",
     "minimist": "^1.2.0",
     "mocha": "^6.0.2",
     "prettier": "^1.16.4",
@@ -106,7 +106,7 @@
     "rollup-plugin-replace": "^2.1.1",
     "rollup-plugin-string": "^3.0.0",
     "rollup-plugin-terser": "^4.0.4",
-    "rollup-plugin-typescript": "^1.0.0",
+    "rollup-plugin-typescript": "^1.0.1",
     "rollup-pluginutils": "^2.5.0",
     "sander": "^0.6.0",
     "shx": "^0.3.2",

test/function/samples/break-label/_config.js

@@ -0,0 +1,8 @@
+const assert = require('assert');
+
+module.exports = {
+	description: 'do not deconflict break label (#2773)',
+	exports(exports) {
+		assert.deepStrictEqual(exports, { value: 'original', n: 1 });
+	}
+};

test/function/samples/break-label/main.js

@@ -0,0 +1,5 @@
+export { n } from './module_1';
+export { value } from './module_2';
+import { n } from './module_2';
+
+n();

test/function/samples/break-label/module_1.js

@@ -0,0 +1 @@
+export var n = 1;

test/function/samples/break-label/module_2.js

@@ -0,0 +1,8 @@
+export let value = 'original';
+
+export function n() {
+	n: if (value === 1) {
+		break n;
+		value = 'changed';
+	}
+}