Add assertion when classification has unexpected length #33938
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sandersn
approved these changes
Oct 17, 2019
andrewbranch
approved these changes
Oct 17, 2019
src/services/classifier.ts
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| @@ -499,8 +499,10 @@ namespace ts { | |||
| return { spans, endOfLineState: EndOfLineState.None }; | |||
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| function pushClassification(start: number, end: number, type: ClassificationType): void { | |||
| const length = end - start; | |||
| Debug.assert(length >= 0, `Classification had non-positive length of ${length}`); | |||
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Slightly nervous about a 0-length span getting a classification unless we classify 0-length trivia...
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Good point. It seemed like some classification spans made sense to only have trivia (since node.getStart is the start used here) but I now see that those won't come up in this path.
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While investigating #33935, one reported repro was found because it caused a classification to have negative length.
Here, we add an assertion so that the language service fails, rather than the client having to handle such a case.