D3(v5) in TypeScript 坐标轴之 scaleBand用法

在学习d3时候，发现在TS中实现D3的坐标轴中遇到一些错误，而这些错误却不会存在于js（因为ts的类型检查）写法中，因此做下笔记：

import * as d3 from 'd3';
import * as React from 'react';

class TestGraph extends React.Component {
    public componentDidMount() {
        const marge = {
            top: 60,
            bottom: 60,
            left: 60,
            right: 60
        };
        const dataSet: any[] = [10, 20, 30, 23, 13, 40, 27, 35, 20];
        const svg = d3.select("svg");
        const g = svg.append("g")
            .attr("transform", `translate(${marge.top},${marge.left})`);
        const width: any = svg.attr('width');
        const height: any = svg.attr('height');
        // 此处必须把.domain里的参数转为字符串数组，不然会报类型错
        const xScale = d3.scaleBand()
            .domain(d3.range(dataSet.length).map(value => {
                return value.toString();
            }))
            .rangeRound([0, width - marge.left - marge.right]);
        const xAxis = d3.axisBottom(xScale);

        const yScale = d3.scaleLinear()
            .domain([0, d3.max(dataSet)])
            .range([height - marge.top - marge.bottom, 0]);
        const yAxis = d3.axisLeft(yScale);

        const gs = g.selectAll(".rect")
            .data(dataSet)
            .enter()
            .append("g");
        const rectPadding = 20;// 矩形之间的间隙
        const rectWidth = xScale.step();
        gs.append("rect")
            .attr("x", (d, i) => {
                // 此处不能用xScale(i)，因为参数只能接受string，就算使用i.toString()，也会报错此对象有可能为undefined
                return xScale.step() * (i + xScale.paddingOuter()) + rectPadding / 2;
            })
            .attr("y", d => {
                return yScale(d);
            })
            .attr("width", rectWidth - rectPadding)
            .attr("height", d => {
                return height - marge.top - marge.bottom - yScale(d);
            })
            .attr("fill", "blue");

        const fontSize = 14;
        gs.append("text")
            .attr("x", (d, i) => {
                return xScale.step() * (i + xScale.paddingOuter()) + rectPadding / 2;
            })
            .attr("y", d => {
                return yScale(d);
            })
            .attr("dx", (xScale.step() - rectPadding) / 2 - fontSize / 2)
            .attr("dy", 20)
            .attr("font-size", fontSize)
            .text(d => {
                return d;
            });

        g.append("g")
            .attr("transform", `translate(0,0)`)
            .call(yAxis);
        g.append("g")
            .attr("transform", `translate(0,${yScale(0)})`)
            .call(xAxis);
    }

    public render() {
        return (
            <svg width={960} height={600}/>
        )
    }
}

export default TestGraph;

效果如下：