guessIndentationFromExistingMembers(sourceFile, node) {
          let indentation;
          let lastRange = node;
          for (const member of getMembersOrProperties(node)) {
            if (rangeStartPositionsAreOnSameLine(lastRange, member, sourceFile)) {
              return void 0;
            }
            const memberStart = member.getStart(sourceFile);
            const memberIndentation = ts_formatting_exports.SmartIndenter.findFirstNonWhitespaceColumn(getLineStartPositionForPosition(memberStart, sourceFile), memberStart, sourceFile, this.formatContext.options);
            if (indentation === void 0) {
              indentation = memberIndentation;
            } else if (memberIndentation !== indentation) {
              return void 0;
            }
            lastRange = member;
          }
          return indentation;
        }
Tries to guess the indentation from the existing members of a class/interface/object. All members must be on
new lines and must share the same indentation.