TinyMCE cannot be minified

[danielmarschall]

TinyMCE contains the following JavaScript:

...
    const hasImage = dataTransfer => exists(dataTransfer.files, file => /^image\//.test(file.type));
    const needsCustomInternalDrop = (dom, schema, target, dropContent) => {
...

//.test(file.type)); seems to be mistaken with a comment and hence the resulting JavaScript raises a syntax error.