microsoft / microsoft/TypeScript
Divide by zero Typechecking
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Description
We have type literals for numbers already and a strictNullCheck compiler option -- wouldn't it be awesome if we had a type guard again divide-by-zero errors? I'm building a game that involved a lot of math, computing intersections of lines and such. But what if a line is parallel? It would be cool if the compiler would suggest this as a type error.
function f(): number | 0 {
return 0
}
const y = 100 / f()
TypeScript Version: 2.7.0-dev.201xxxxx
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First steps
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Research direction
No source file, test, or entry point is named. First reproduce the example with typescript@next and examine how the type checker handles the number | 0 return type and division; done means the compiler consistently identifies a possibly zero divisor and reports an appropriate type error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 30/100