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Revert this-parameter filtering for methods #31349

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DanielRosenwasser opened this issue May 10, 2019 · 5 comments · Fixed by #31377
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Revert this-parameter filtering for methods #31349

DanielRosenwasser opened this issue May 10, 2019 · 5 comments · Fixed by #31377
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@ahejlsberg
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In Discussion Not yet reached consensus Suggestion An idea for TypeScript

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@DanielRosenwasser
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DanielRosenwasser commented May 10, 2019 •
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We believe #20616 may be the cause of some recent slowness in editor completions. We are considering reverting the feature to increase performance (admittedly at the expense of some editor UX).
@DanielRosenwasser DanielRosenwasser added Suggestion An idea for TypeScript In Discussion Not yet reached consensus labels May 10, 2019
@DanielRosenwasser
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Removing the logic doesn't seem to do much from what we've seen. Completions are still ridiculously slow.

@ahejlsberg
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See #31354 for the real fix.

@ahejlsberg
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I'm reopening this issue. Turns out this-parameter filtering is also a contributor to the slowdown, it's just that the eager conditional type true/false branch resolution is the main offender. I have verified that removing the this-parameter filtering greatly speeds up completions with styled-components. We basically need both fixes.

@ahejlsberg ahejlsberg reopened this May 13, 2019
@DanielRosenwasser
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Understandable if we have to, but it would be unfortunate. Libraries like fp-ts v2 would be affected.

@mattiamanzati
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Is it really worth it? Will some flag to turn this on be present? DX will suffer a lot :/

@ahejlsberg ahejlsberg mentioned this issue May 13, 2019
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Revert this-parameter filtering in completions microsoft/TypeScript
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@DanielRosenwasser @ahejlsberg @mattiamanzati