Type typescript?

Comment exprimer des dates dans TypeScript? Les dates ne sont pas un type TypeScript , est-ce que j’utilise any object ou un object ? On dirait qu’il y aurait une “bonne” façon de faire:

 let myDate: any = new Date(); 

Je ne pouvais pas trouver grand chose sur Google, même si c’était une question si simple.

    La réponse est super simple, le type est Date :

     const d: Date = new Date(); // but the type can also be inferred from "new Date()" already 

    C’est la même chose que pour toute autre instance d’object 🙂

    Toute classe ou interface peut être utilisée comme type dans TypeScript.

      const date = new Date(); 

    connaîtra déjà la définition du type de Date car Date est un object TypeScript interne référencé par l’interface DateConstructor.

    Et pour le constructeur que vous avez utilisé, il est défini comme suit:

     interface DateConstructor { new(): Date; ... } 

    Pour le rendre plus explicite, vous pouvez utiliser:

      const date: Date = new Date(); 

    Cependant, il se tsconfig.json vous tsconfig.json les définitions de type, la Date commence pour mon exemple à partir de la librairie ES6 et dans mon tsconfig.json j’ai défini:

     "comstackrOptions": { "target": "ES6", "lib": [ "es6", "dom" ], 

    Vous pouvez adapter ces parameters pour cibler votre version de JavaScript souhaitée.


    La date est d’ailleurs une interface de lib.es6.d.ts :

     /** Enables basic storage and resortingeval of dates and times. */ interface Date { /** Returns a ssortingng representation of a date. The format of the ssortingng depends on the locale. */ toSsortingng(): ssortingng; /** Returns a date as a ssortingng value. */ toDateSsortingng(): ssortingng; /** Returns a time as a ssortingng value. */ toTimeSsortingng(): ssortingng; /** Returns a value as a ssortingng value appropriate to the host environment's current locale. */ toLocaleSsortingng(): ssortingng; /** Returns a date as a ssortingng value appropriate to the host environment's current locale. */ toLocaleDateSsortingng(): ssortingng; /** Returns a time as a ssortingng value appropriate to the host environment's current locale. */ toLocaleTimeSsortingng(): ssortingng; /** Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC. */ valueOf(): number; /** Gets the time value in milliseconds. */ getTime(): number; /** Gets the year, using local time. */ getFullYear(): number; /** Gets the year using Universal Coordinated Time (UTC). */ getUTCFullYear(): number; /** Gets the month, using local time. */ getMonth(): number; /** Gets the month of a Date object using Universal Coordinated Time (UTC). */ getUTCMonth(): number; /** Gets the day-of-the-month, using local time. */ getDate(): number; /** Gets the day-of-the-month, using Universal Coordinated Time (UTC). */ getUTCDate(): number; /** Gets the day of the week, using local time. */ getDay(): number; /** Gets the day of the week using Universal Coordinated Time (UTC). */ getUTCDay(): number; /** Gets the hours in a date, using local time. */ getHours(): number; /** Gets the hours value in a Date object using Universal Coordinated Time (UTC). */ getUTCHours(): number; /** Gets the minutes of a Date object, using local time. */ getMinutes(): number; /** Gets the minutes of a Date object using Universal Coordinated Time (UTC). */ getUTCMinutes(): number; /** Gets the seconds of a Date object, using local time. */ getSeconds(): number; /** Gets the seconds of a Date object using Universal Coordinated Time (UTC). */ getUTCSeconds(): number; /** Gets the milliseconds of a Date, using local time. */ getMilliseconds(): number; /** Gets the milliseconds of a Date object using Universal Coordinated Time (UTC). */ getUTCMilliseconds(): number; /** Gets the difference in minutes between the time on the local computer and Universal Coordinated Time (UTC). */ getTimezoneOffset(): number; /** * Sets the date and time value in the Date object. * @param time A numeric value representing the number of elapsed milliseconds since midnight, January 1, 1970 GMT. */ setTime(time: number): number; /** * Sets the milliseconds value in the Date object using local time. * @param ms A numeric value equal to the millisecond value. */ setMilliseconds(ms: number): number; /** * Sets the milliseconds value in the Date object using Universal Coordinated Time (UTC). * @param ms A numeric value equal to the millisecond value. */ setUTCMilliseconds(ms: number): number; /** * Sets the seconds value in the Date object using local time. * @param sec A numeric value equal to the seconds value. * @param ms A numeric value equal to the milliseconds value. */ setSeconds(sec: number, ms?: number): number; /** * Sets the seconds value in the Date object using Universal Coordinated Time (UTC). * @param sec A numeric value equal to the seconds value. * @param ms A numeric value equal to the milliseconds value. */ setUTCSeconds(sec: number, ms?: number): number; /** * Sets the minutes value in the Date object using local time. * @param min A numeric value equal to the minutes value. * @param sec A numeric value equal to the seconds value. * @param ms A numeric value equal to the milliseconds value. */ setMinutes(min: number, sec?: number, ms?: number): number; /** * Sets the minutes value in the Date object using Universal Coordinated Time (UTC). * @param min A numeric value equal to the minutes value. * @param sec A numeric value equal to the seconds value. * @param ms A numeric value equal to the milliseconds value. */ setUTCMinutes(min: number, sec?: number, ms?: number): number; /** * Sets the hour value in the Date object using local time. * @param hours A numeric value equal to the hours value. * @param min A numeric value equal to the minutes value. * @param sec A numeric value equal to the seconds value. * @param ms A numeric value equal to the milliseconds value. */ setHours(hours: number, min?: number, sec?: number, ms?: number): number; /** * Sets the hours value in the Date object using Universal Coordinated Time (UTC). * @param hours A numeric value equal to the hours value. * @param min A numeric value equal to the minutes value. * @param sec A numeric value equal to the seconds value. * @param ms A numeric value equal to the milliseconds value. */ setUTCHours(hours: number, min?: number, sec?: number, ms?: number): number; /** * Sets the numeric day-of-the-month value of the Date object using local time. * @param date A numeric value equal to the day of the month. */ setDate(date: number): number; /** * Sets the numeric day of the month in the Date object using Universal Coordinated Time (UTC). * @param date A numeric value equal to the day of the month. */ setUTCDate(date: number): number; /** * Sets the month value in the Date object using local time. * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. * @param date A numeric value representing the day of the month. If this value is not supplied, the value from a call to the getDate method is used. */ setMonth(month: number, date?: number): number; /** * Sets the month value in the Date object using Universal Coordinated Time (UTC). * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. * @param date A numeric value representing the day of the month. If it is not supplied, the value from a call to the getUTCDate method is used. */ setUTCMonth(month: number, date?: number): number; /** * Sets the year of the Date object using local time. * @param year A numeric value for the year. * @param month A zero-based numeric value for the month (0 for January, 11 for December). Must be specified if numDate is specified. * @param date A numeric value equal for the day of the month. */ setFullYear(year: number, month?: number, date?: number): number; /** * Sets the year value in the Date object using Universal Coordinated Time (UTC). * @param year A numeric value equal to the year. * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. Must be supplied if numDate is supplied. * @param date A numeric value equal to the day of the month. */ setUTCFullYear(year: number, month?: number, date?: number): number; /** Returns a date converted to a ssortingng using Universal Coordinated Time (UTC). */ toUTCSsortingng(): ssortingng; /** Returns a date as a ssortingng value in ISO format. */ toISOSsortingng(): ssortingng; /** Used by the JSON.ssortingngify method to enable the transformation of an object's data for JavaScript Object Notation (JSON) serialization. */ toJSON(key?: any): ssortingng; }