upgrade Acorn - fixes #1949

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "3.0.0-alpha13",
+  "version": "3.0.0-alpha16",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -217,19 +217,16 @@
       "dev": true
     },
     "acorn": {
-      "version": "5.7.3",
+      "version": "6.0.5",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.5.tgz",
-      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
+      "integrity": "sha512-i33Zgp3XWtmZBMNvCr4azvOFeWVw1Rk6p3hfi3LUDvIFraOMywb1kAtrbi+med14m4Xfpqm3zRZMT+c0FNE7kg==",
       "dev": true
     },
     "acorn-dynamic-import": {
-      "version": "3.0.0",
+      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-3.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz",
-      "integrity": "sha512-zVWV8Z8lislJoOKKqdNMOB+s6+XV5WERty8MnKBeFgwA+19XJjJHs2RP5dzM57FftIs+jQnRToLiWazKr6sSWg==",
+      "integrity": "sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw==",
-      "dev": true,
+      "dev": true
-      "requires": {
-        "acorn": "^5.0.0"
-      }
     },
     "acorn-globals": {
       "version": "4.3.0",
@@ -2934,6 +2931,14 @@
         "whatwg-url": "^6.4.1",
         "ws": "^5.2.0",
         "xml-name-validator": "^3.0.0"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "5.7.3",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
+          "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
+          "dev": true
+        }
       }
     },
     "jsesc": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "3.0.0-alpha15",
+  "version": "3.0.0-alpha16",
   "description": "The magical disappearing UI framework",
   "module": "index.mjs",
   "main": "index.js",
@@ -55,8 +55,8 @@
   "devDependencies": {
     "@types/mocha": "^5.2.0",
     "@types/node": "^10.5.5",
-    "acorn": "^5.4.1",
+    "acorn": "^6.0.5",
-    "acorn-dynamic-import": "^3.0.0",
+    "acorn-dynamic-import": "^4.0.0",
     "agadoo": "^1.0.1",
     "codecov": "^3.0.0",
     "css-tree": "1.0.0-alpha22",

src/parse/acorn.ts

@@ -0,0 +1,15 @@
+import * as acorn from 'acorn';
+import dynamicImport from 'acorn-dynamic-import';
+
+const Parser = acorn.Parser.extend(dynamicImport);
+
+export const parse = (source: string, options: any) => Parser.parse(source, {
+	sourceType: 'module',
+	ecmaVersion: 9,
+	preserveParens: true
+});
+
+export const parseExpressionAt = (source: string, index: number, options: any) => Parser.parseExpressionAt(source, index, {
+	ecmaVersion: 9,
+	preserveParens: true
+});

src/parse/read/expression.ts

@@ -1,4 +1,4 @@
-import { parseExpressionAt } from 'acorn';
+import { parseExpressionAt } from '../acorn';
 import { Parser } from '../index';
 
 const literals = new Map([['true', true], ['false', false], ['null', null]]);
@@ -31,13 +31,7 @@ export default function readExpression(parser: Parser) {
 	parser.index = start;
 
 	try {
-		const node = parseExpressionAt(parser.template, parser.index, {
+		const node = parseExpressionAt(parser.template, parser.index);
-			ecmaVersion: 9,
-			preserveParens: true,
-			plugins: {
-				dynamicImport: true
-			}
-		});
 		parser.index = node.end;
 
 		return node;

src/parse/read/script.ts

@@ -1,13 +1,10 @@
-import * as acorn from 'acorn';
+import * as acorn from '../acorn';
-import injectDynamicImport from 'acorn-dynamic-import/src/inject';
 import repeat from '../../utils/repeat';
 import { Parser } from '../index';
 import { Node } from '../../interfaces';
 
 const scriptClosingTag = '</script>';
 
-injectDynamicImport(acorn);
-
 export default function readScript(parser: Parser, start: number, attributes: Node[]) {
 	const scriptStart = parser.index;
 	const scriptEnd = parser.template.indexOf(scriptClosingTag, scriptStart);
@@ -24,13 +21,7 @@ export default function readScript(parser: Parser, start: number, attributes: No
 	let ast;
 
 	try {
-		ast = acorn.parse(source, {
+		ast = acorn.parse(source);
-			ecmaVersion: 9,
-			sourceType: 'module',
-			plugins: {
-				dynamicImport: true
-			}
-		});
 	} catch (err) {
 		parser.acornError(err);
 	}