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const WORLTIDES_URL = 'https://www.worldtides.info/api/v2'
type datumValues = 'LAT'  | 'MLLWS'  | 'MLWS'  | 'MHLWS'  | 'MLLW'  | 'MLW'  | 'MHLW'  | 'MLLWN'  | 'MLWN'  | 'MHLWN'  | 'MTL'  | 'MSL'  | 'MLHWN'  | 'MHWN'  | 'MHHWN'  | 'MLHW'  | 'MHW'  | 'MHHW'  | 'MLHWS'  | 'MHWS'  | 'MHHWS'  | 'HAT'
type plot = {  width?: number  height?: number  fontSize?: number  grid?: 'none' | 'course' | 'fine'  color?: string  background?: string}
type parameters = {  key?: string  heights?: boolean,  extremes?: boolean,  date?: Date,  days?: 1|2|3|4|5|6|7,  datum?: datumValues,  datums?: boolean,  lat?: number,  lon?: number,  plot?: plot | boolean,  stationDistance?: number,  stations?: boolean,  start?: number,  length?: number,  step?: number,}
type apiResponse = {  status: number,  error?: string,  requestDatum?: datumValues,  responseDatum?: datumValues,  requestLat: number,  requestLon: number,  responseLat: number,  responseLon: number,  callCount: number,  atlas: string,  station?: string,  copyright: string,  plot?: string,  stations?: {    id: string,    name: string,    lat: string,    lon: string,    timezone: string,  }[],  stationDistance?: number,  heights: {    dt: number,    date: string,    height: number,  }[],  extremes: {    dt: number,    date: string,    height: number,    type: 'Low' | 'High'  }[],  datums: {    name: string,    height: number  }[]}
export class Worldtides {  private parameters: parameters  constructor(parameters: parameters & { key: string }) {    this.parameters= parameters  }
  public setParameters(parameters: parameters) {    this.parameters = {      ...this.parameters,      ...parameters    }  }
  public async request(parameters: parameters): Promise<apiResponse> {    const url = this.buildUrl(parameters)    const result = await fetch(      url    )    return result.json()  }
  private buildUrl(parameters: parameters): string {    if (!parameters.key && !this.parameters.key) {      throw new Error('API key required')    }    if (parameters.lat === undefined && this.parameters.lat === undefined) {      throw new Error('Lat required')    }    if (!parameters.lon === undefined && !this.parameters.lon === undefined) {      throw new Error('Lon required')    }    const finalParameters = {      ...this.parameters,      ...parameters    }
    finalParameters.lat = parameters.lat === undefined ? this.parameters.lat : parameters.lat    finalParameters.lon = parameters.lon === undefined ? this.parameters.lon : parameters.lon    let url = WORLTIDES_URL        return `${url}?${this.serializeQueryString(finalParameters)}`  }
  private serializeQueryString(obj: parameters | plot): string {    return Object.entries(obj).map(      ([key, value]) => {        if (value === undefined) {          return        }        if (value instanceof Date) {          let month: number | string = value.getMonth() + 1          if (month < 10) {            month = '0' + month          }          let day: number | string = value.getDate() + 1          if (day < 10) {            day = '0' + day          }          value = `${value.getFullYear()}-${month}-${day}`        }        else if (typeof value === 'object') {          return this.serializeQueryString(value)        }        if (value === true) {          return key        }        return `${key}=${encodeURIComponent(value)}`      }    ).filter(e => e).join('&')  }}