fix: add cache for getAstTitle in typescript parser #109
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Description
I left this comment on a previous PR and I since wonder what was the perf impact. It was less bad than expected: 4ms per keystroke on my Mac for a 1.4k lines file (Vite's optimizer/index.ts). But I don't think people will use it with that much code. Anyway once checkout it was cheap to make the PR, I let you decide if you want to merge it or not.