nullish coalescence in js leads to error

[starsolaris]

fuse-box 4.0.0-next.447
next code in js:

return item ?? null;

lead to:

⚠️  Error while parsing module g:\source\git\modules\solid\node_modules\vis-data\esnext\esm\vis-data.js
        ' SyntaxError: [1239:30]: Unexpected token: '?'
    at report (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:188:13)
    at parsePrimaryExpression (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:4113:15)
    at parseExpression (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:3542:18)
    at parseConditionalExpression (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:3615:26)
    at parseAssignmentExpression (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:3591:18)
    at parseExpression (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:3544:14)
    at parseExpressions (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:3557:20)
    at parseReturnStatement (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2696:13)
    at parseStatement (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2609:22)
    at parseStatementListItem (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2601:22)
    at parseBlock (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2682:21)
    at parseStatement (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2623:22)
    at parseConsequentOrAlternative (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2827:13)
    at parseIfStatement (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2810:26)
    at parseStatement (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2611:22)
    at parseStatementListItem (g:\source\git\modules\solid\node_modules\meriyah\dist\meriyah.umd.js:2601:22)

[charsleysa]

@starsolaris can you please create a minimal reproduction?

[starsolaris]

@charsleysa i rechecked this issue, and found that scenario is more complex:

package.json

{
  "name": "3",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "scripts": {
    "build": "ts-node -T fuse build"
  },  
  "dependencies": {
    "fuse-box": "4.0.0-next.447",
    "ts-node": "^9.1.1",
    "typescript": "^4.1.3"
  }
}

test.ts

import {b} from "accepts/a";

console.log(b);

a.js

function b() {
	return item ?? null;
}
export {b};

copy a.js to some module in node_modules (ex: accepts/a.js)
run with start entry test.ts:

 ⚠️  Error while parsing module g:\source\git\modules\3\node_modules\accepts\a.js
        ' SyntaxError: [2:15]: Unexpected token: '?'
    at report (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:188:13)
    at parsePrimaryExpression (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:4113:15)
    at parseExpression (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:3542:18)
    at parseConditionalExpression (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:3615:26)
    at parseAssignmentExpression (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:3591:18)
    at parseExpression (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:3544:14)
    at parseExpressions (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:3557:20)
    at parseReturnStatement (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:2696:13)
    at parseStatement (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:2609:22)
    at parseStatementListItem (g:\source\git\modules\3\node_modules\meriyah\dist\meriyah.umd.js:2601:22)

if i import a.js from local directory:
test,ts

import {b} from "./a";

console.log(b);

then build completed without errors