How to use the eslint-utils.isOpeningBraceToken function in eslint-utils

SwitchStatement(node) {
                const openingCurly = sourceCode.getTokenAfter(node.discriminant, eslint_utils_1.isOpeningBraceToken);
                const closingCurly = sourceCode.getLastToken(node);
                offsets.setDesiredOffsets([openingCurly.range[1], closingCurly.range[0]], openingCurly, options.SwitchCase);
                if (node.cases.length) {
                    sourceCode
                        .getTokensBetween(node.cases[node.cases.length - 1], closingCurly, {
                        includeComments: true,
                        filter: eslint_utils_1.isCommentToken,
                    })
                        .forEach(token => offsets.ignoreToken(token));
                }
            },
            SwitchCase(node) {

ImportDeclaration(node) {
                if (node.specifiers.some(specifier => specifier.type === 'ImportSpecifier')) {
                    const openingCurly = sourceCode.getFirstToken(node, eslint_utils_1.isOpeningBraceToken);
                    const closingCurly = sourceCode.getLastToken(node, eslint_utils_1.isClosingBraceToken);
                    addElementListIndent(node.specifiers.filter(specifier => specifier.type === 'ImportSpecifier'), openingCurly, closingCurly, options.ImportDeclaration);
                }
                const fromToken = sourceCode.getLastToken(node, token => token.type === 'Identifier' && token.value === 'from');
                const sourceToken = sourceCode.getLastToken(node, token => token.type === 'String');
                const semiToken = sourceCode.getLastToken(node, token => token.type === experimental_utils_1.AST_TOKEN_TYPES.Punctuator && token.value === ';');
                if (fromToken) {
                    const end = semiToken && semiToken.range[1] === sourceToken.range[1]
                        ? node.range[1]
                        : sourceToken.range[1];
                    offsets.setDesiredOffsets([fromToken.range[0], end], sourceCode.getFirstToken(node), 1);
                }
            },
            'MemberExpression, JSXMemberExpression, MetaProperty'(node) {