$ signs in object key names marked red

[jsalvata]

https://json5.org/ specifies that keys can be ECMAScript 5.1 IdentifierName.

So this pattern should include the dollar sign (among other changes, probably): https://github.com/mrmlnc/vscode-json5/blob/master/syntaxes/json5.json#L147

[chaeron]

Any chance this will be resolved any time soon?

[irvnriir]

$id , $type , $values and such other are used as keywords for exporting/importing Objects, i assume that they should be marked with warnings .