docx-js/src/file/document/body/section-properties/properties/line-number.ts

// http://officeopenxml.com/WPsectionLineNumbering.php
import { NextAttributeComponent, XmlComponent } from "@file/xml-components";
import { decimalNumber, PositiveUniversalMeasure, twipsMeasureValue } from "@util/values";

// <xsd:simpleType name="ST_LineNumberRestart">
// <xsd:restriction base="xsd:string">
//   <xsd:enumeration value="newPage"/>
//   <xsd:enumeration value="newSection"/>
//   <xsd:enumeration value="continuous"/>
// </xsd:restriction>
// </xsd:simpleType>
export enum LineNumberRestartFormat {
    NEW_PAGE = "newPage",
    NEW_SECTION = "newSection",
    CONTINUOUS = "continuous",
}

// <xsd:complexType name="CT_LineNumber">
//     <xsd:attribute name="countBy" type="ST_DecimalNumber" use="optional"/>
//     <xsd:attribute name="start" type="ST_DecimalNumber" use="optional" default="1"/>
//     <xsd:attribute name="distance" type="s:ST_TwipsMeasure" use="optional"/>
//     <xsd:attribute name="restart" type="ST_LineNumberRestart" use="optional" default="newPage"/>
// </xsd:complexType>

export interface ILineNumberAttributes {
    readonly countBy?: number;
    readonly start?: number;
    readonly restart?: LineNumberRestartFormat;
    readonly distance?: number | PositiveUniversalMeasure;
}

export class LineNumberType extends XmlComponent {
    public constructor({ countBy, start, restart, distance }: ILineNumberAttributes) {
        super("w:lnNumType");
        this.root.push(
            new NextAttributeComponent<{
                readonly countBy?: number;
                readonly start?: number;
                readonly restart?: LineNumberRestartFormat;
                readonly distance?: number | PositiveUniversalMeasure;
            }>({
                countBy: { key: "w:countBy", value: countBy === undefined ? undefined : decimalNumber(countBy) },
                start: { key: "w:start", value: start === undefined ? undefined : decimalNumber(start) },
                restart: { key: "w:restart", value: restart },
                distance: { key: "w:distance", value: distance === undefined ? undefined : twipsMeasureValue(distance) },
            }),
        );
    }
}