feat: support import assertions (#417)

`acorn-import-attributes` [did not support import assertions
before](#377 (comment)),
but now it does!

This is important because `acorn` is failing to parse `runner.js` in
[this issue](vercel/vercel#11533) due to an
import assertion.

package.json

@@ -25,7 +25,7 @@
     "@mapbox/node-pre-gyp": "^1.0.5",
     "@rollup/pluginutils": "^4.0.0",
     "acorn": "^8.6.0",
-    "acorn-import-attributes": "^1.9.2",
+    "acorn-import-attributes": "^1.9.5",
     "async-sema": "^3.1.1",
     "bindings": "^1.4.0",
     "estree-walker": "2.0.2",

src/analyze.ts

@@ -33,7 +33,7 @@ const acorn = Parser.extend(
   //require("acorn-class-fields"),
   //require("acorn-static-class-features"),
   //require("acorn-private-class-elements")
-  require('acorn-import-attributes').importAttributes,
+  require('acorn-import-attributes').importAttributesOrAssertions,
 );
 
 import os from 'os';

test/unit/import-assertions/info.json

@@ -0,0 +1,3 @@
+{
+  "foo": "bar"
+}

test/unit/import-assertions/input.js

@@ -0,0 +1,4 @@
+import foo from "./foo"
+import info from "./info.json" assert { type: "json" }
+
+export default info

test/unit/import-assertions/output.js

@@ -0,0 +1,6 @@
+[
+  "package.json",
+  "test/unit/import-assertions/foo.js",
+  "test/unit/import-assertions/info.json",
+  "test/unit/import-assertions/input.js"
+]