Migrate @turf/interpolate to TypeScript #2966
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| throw new Error("weight must be a number"); | ||
| } | ||
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| box = box ?? bbox(points); |
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^ the defaults got pushed above, but the bbox(points) call has to be after the falsy check for points or we lose the useful error message from the validation.
| }); | ||
| // write interpolated value for each grid point | ||
| var newFeature = clone(gridFeature); | ||
| newFeature.properties ??= {}; |
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On the below line, the properties could have been null from the types, so we just make sure its there before proceeding.
packages/turf-interpolate/index.ts
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| * var addToMap = [grid]; | ||
| */ | ||
| function interpolate(points, cellSize, options) { | ||
| function interpolate<T extends "point" | Grid>( |
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What do you reckon about changing this to:
function interpolate<T extends Grid = "square">(
"point" is an element of the Grid union anyway, so no need to list it separately. This still seems to allow the conditional return type determination at the end of the function to work.
And I noticed if gridType is left empty, with the current definition the return type is Point | Polygon. However our runtime default is square which unambiguously infers Polygon. Setting that for the template default lets TS narrow the return type.
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Good catch that's a nice improvement
smallsaucepan
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smallsaucepan
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Thank you @mfedderly. One more step towards TS throughout 🎉
Benchmarks were mixed, but performance is pretty much the same before/after.