From comment #857 (comment):

Found another bug:

<App foo={
{ bar: true, baz: true }
} />;

This would get 2 errors using the default settings: There should be no space after '{' and There should be no space before '}'.

This is because conditions for the object literal spacing were written so that the second one was never reached:

          if (sourceCode.isSpaceBetweenTokens(first, second)) {
            reportNoBeginningSpace(node, first);
          } else if (!config.allowMultiline && isMultiline(first, second)) {
            reportNoBeginningNewline(node, first, config);
          }

If the first condition fails, isMultiline will return false - there is no newline.

Will fix this and add appropriate tests.