function validateBigIntConstructor( node ) {
		if (
			node.callee &&
			node.callee.type === 'Identifier' &&
			node.callee.name === 'BigInt'
		) {
			if ( isImportedBigInt( scope ) ) {
				return;
			}
			report( node, 'CallExpression' );
		}
	}
Validates a BigInt constructor.

@private
@param {ASTNode} node - node to examine