How to use the @ts-morph/common.ts.isTypeLiteralNode function in @ts-morph/common

static getContainerBodyPos(container: ContainerNodes, sourceFile: ts.SourceFile) {
        if (ts.isSourceFile(container))
            return 0;

        if (ts.isClassDeclaration(container)
            || ts.isEnumDeclaration(container)
            || ts.isInterfaceDeclaration(container)
            || ts.isTypeLiteralNode(container)
            || ts.isClassExpression(container)
            || ts.isBlock(container)
            || ts.isModuleBlock(container)
            || ts.isObjectLiteralExpression(container))
        {
            // this function is only used when there are no statements or members, so only do this
            return getTokenEnd(container, SyntaxKind.OpenBraceToken);
        }

        if (ts.isCaseClause(container) || ts.isDefaultClause(container))
            return getTokenEnd(container, SyntaxKind.ColonToken);

        return errors.throwNotImplementedForNeverValueError(container);

        function getTokenEnd(node: ts.Node, kind: SyntaxKind.OpenBraceToken | SyntaxKind.ColonToken) {
            // @code-fence-allow(getChildren): Ok, not searching for comments.

function getCtor() {
            if (isStatementContainerNode(container))
                return CompilerCommentStatement;
            if (ts.isClassLike(container))
                return CompilerCommentClassElement;
            if (ts.isInterfaceDeclaration(container) || ts.isTypeLiteralNode(container))
                return CompilerCommentTypeElement;
            if (ts.isObjectLiteralExpression(container))
                return CompilerCommentObjectLiteralElement;
            if (ts.isEnumDeclaration(container))
                return CompilerCommentEnumMember;

            throw new errors.NotImplementedError(`Not implemented comment node container type: ${getSyntaxKindName(container.kind)}`);
        }
    }

function getContainerChildren() {
        if (ts.isSourceFile(container) || ts.isBlock(container) || ts.isModuleBlock(container) || ts.isCaseClause(container) || ts.isDefaultClause(container))
            return container.statements;

        if (ts.isClassDeclaration(container)
            || ts.isClassExpression(container)
            || ts.isEnumDeclaration(container)
            || ts.isInterfaceDeclaration(container)
            || ts.isTypeLiteralNode(container)
            || ts.isClassExpression(container))
        {
            return container.members;
        }

        if (ts.isObjectLiteralExpression(container))
            return container.properties;

        return errors.throwNotImplementedForNeverValueError(container);
    }