Is there a way to retrieve the `data` property within this particular type?

I have encountered a new type from a library:

export interface AllChartOptions {
  series: ApexAxisChartSeries | ApexNonAxisChartSeries;
  ...
}

This is the definition of series:

export declare type ApexAxisChartSeries = {
    name?: string;
    type?: string;
    color?: string;
    group?: string;
    data: (number | null)[] | {
        x: any;
        y: any;
        ...
    }[] | [number, number | null][] | [number, (number | null)[]][] | number[][];
}[];
export declare type ApexNonAxisChartSeries = number[];

It seems that when series is of type ApexAxisChartSeries, it contains the property data. Therefore, I should be able to perform:

chart.series.map((singleSeries)=> {...})

Am I correct in assuming that I can access data from singleSeries? Despite this, VS Code indicates that singleSeries is of type:

singleSeries: number | {
  name?: string | undefined;
  type?: string | undefined;
  color?: string | undefined;
  group?: string | undefined;
  data: number[][] | (number | null)[] | {
      x: any;
      y: any;
      fill?: ApexFill | undefined;
      ... 5 more ...;
      columnWidthOffset?: number | undefined;
  }[] | [...][] | [...][];
}

However, the only available options for interacting with singleSeries are

toLocaleString, toString, valueOf
. Why is this happening? How can I actually access data?

Answer №1

Given that the series is categorized as either ApexAxisChartSeries or ApexNonAxisChartSeries, it could potentially be a number[]. Therefore, I believe the code should function properly if you acknowledge that it may not necessarily be a number[].

A potential solution could look something like this:

chart.series.map((singleSeries)=> {
  // By adding this line, TypeScript will recognize it as an ApexAxisChartSeries within the if statement.
  if("data" in singleSeries) {
    singleSeries.data
  }
})

Alternatively, if you are confident in your data and do not need to perform this check every time, you can use type assertion.

chart.series.map((singleSeries)=>{
  const singleAxisSeries = singleSeries as ApexAxisChartSeries;
  singleAxisSeries.data:
})

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