[d3-scale] Can't pass string range to linear scale

[rybaczewa]

Passing string range to scaleLinear like so:

import * as d3Scale from 'd3-scale';

d3Scale.scaleLinear()
  .domain([1, 20])
  .clamp(true)
  .range(['#fff', '#000']);

Argument of type 'string[]' is not assignable to parameter of type 'number[]'.

As seen here, this should be possible:

Unlike the domain, elements in the given array need not be numbers; any value that is supported by the underlying interpolator will work

[tomwanzek]

scaleLinear() as a scale factory and the corresponding interface ScaleLinear are parameterized with two generics (Range and Output). By default, i.e. scaleLinear(), these default to number.

To set another type for the range (and or scale output), please use scaleLinear<string>() or similar. The JSDoc comments for the linear scale generator explain the usage for each of the signatures.

The service works as intended. 😄

[rybaczewa]

My bad then, I misunderstood the function comments. Thanks for help.

[tomwanzek]

No worries.