javascript エラー「Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of “application/json”. Strict MIME type checking is enforced for module scripts per HTML spec.」の解決方法

<script type="module" src="test.js"></script>

import test from './test.json' assert {type: 'json'};

for (let item in test) {
    console.log(item);
};

Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "application/json". Strict MIME type checking is enforced for module scripts per HTML spec.

MIME タイプ (“application/json”) が許可されていないため、“http://mebee.com:8080/test.json” からのモジュールの読み込みがブロックされました

import test from './test.json' assert {type: 'json'};

for (let item in test) {
    console.log(item);
};

Uncaught SyntaxError: import assertions are not currently supported

SyntaxError: Unexpected identifier 'assert'. Expected a ';' following a targeted import declaration.