c# - Typescript with d3js with definitlyTyped -

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so, first day typescript.

i ran trouble code: 

  var x: d3.scale.ordinal = d3.scale.ordinal()             .rangeroundbands([0, +this.params.width], .1)             .domain(data.map(function (d) {                 return d.dayname;             }));

i want x of type ordinal scale, reason error: 

generic type 'ordinal<domain, range>' requires 2 type argument(s).

and sure enough in code definitlytyped can see following : 

 interface ordinal<domain extends { tostring(): string }, range> {         (x: domain): range;          domain(): domain[];         domain(values: domain[]): ordinal<domain, range>;          range(): range[];         range(values: range[]): ordinal<domain, range>;          rangepoints(interval: [number, number], padding?: number): ordinal<domain, number>;         rangeroundpoints(interval: [number, number], padding?: number): ordinal<domain, number>;          rangebands(interval: [number, number], padding?: number, outerpadding?: number): ordinal<domain, number>;         rangeroundbands(interval: [number, number], padding?: number, outerpadding?: number): ordinal<domain, number>;          rangeband(): number;         rangeextent(): [number, number];          copy(): ordinal<domain, range>;     }

so ordinal need have 2 types, domain , range, cant find anywhere structure.

how solve problem? or have misunderstood something?

domain , range generic type arguments, placeholders types need provide rather actual concrete types. domain can type has tostring method, , range can apparently type want.

typings in definitelytyped repository have tests ensure typings work expected, , if you're trying figure out how use typings first step looking @ tests. here's relevant example d3 tests:

var fill = d3.scale.ordinal<number, string>()     .domain(d3.range(4))     .range(["#000000", "#ffdd89", "#957244", "#f26223"]);

so think should work you:

var x: d3.scale.ordinal<string, number> = d3.scale.ordinal<string, number>()         .rangeroundbands([0, +this.params.width], .1)         .domain(data.map(function (d) {             return d.dayname;         }));

or can let compiler deduce type of variable:

var x = d3.scale.ordinal<string, number>()         .rangeroundbands([0, +this.params.width], .1)         .domain(data.map(function (d) {             return d.dayname;         }));

if you're unfamiliar generic types in typescript, suggest reading section on generics in typescript handbook.


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