Typescript: 2.5gb on small project

[edunsouza]

I have a small project of Natural Language Processing and there are 2 files with 37k lines, which contains the datasets. The problem occurs even when i'm not using those files. Not even opening the files. I have to use other editor to run "node index.js" -my main fail.

I dont know how the problem starts, but when i open the vscode editor, it goes up to 2.5gb of ram on the startup. I dont know what is happening.

[chrmarti]

/needsMoreInfo

What is the file type of the data files?

[vscodebot[bot]]

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[edunsouza]

/needsMoreInfo

What is the file type of the data files?

They are all javascript and json files.
Vscode takes a while to shoot up the memory. When it does, the ram usage goes up to 2.5gb and starts to freeze some features.

[chrmarti]

Does it reproduce when starting with code --disable-extensions?

[edunsouza]

Yes, it does. I found out that the process “ts/js language features” is the
responsible for the 2.5gb usage. When i manually disabled the feature, it
starts to work normally. But only without JS intellisense features, and
thats sad :/

Em ter, 13 de nov de 2018 às 07:33, Christof Marti [e-mail]
escreveu:

Does it reproduce when starting with code --disable-extensions?

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[mjbvz]

@edunsouza Can you share those source files?

[edunsouza]

@mjbvz of course I can! And I'll be happy if I can help to find out the problem.

The files are available on the repository: https://github.com/edunsouza/communicator

[mjbvz]

Tested using [email protected]

Switching between the js files in dataset/ I can still easily get up to over a GB. Seems mostly to happen after switching to another js file not under dataset.

Logs:
tsserver.log

[DanielRosenwasser]

@sandersn and @ahejlsberg, any ideas on how we could do better here?

[ahejlsberg]

The issue looks to be with the dataset/afinn/afinn.js file. It contains an array literal with 30K+ elements specified as object literals:

module.exports = [
    {texto: ";)", sentimento: 1, ";)": 1},
    {texto: ";@", sentimento: -1, ";@": -1},
    {texto: ";*", sentimento: -1, ";*": -1},
    {texto: ";**", sentimento: -1, ";**": -1},
    {texto: ";~", sentimento: -1, ";~": -1},
    ...
];

The reverse mapping pattern means that each object literal has a unique type. To make matters worse, object literal normalization (#19513) causes us to expand into 30K+ unique types with 30K+ properties each (!!!). We then attempt to perform subtype reduction on the set of types in order to make a union type. This ends up generating enormous amounts of work. If I reduce down to 2500 unique types we still take close to 30 seconds to type check, so with 30K+ types we'll effectively take forever.

I'm thinking we should consider a governor on union subtype reduction. Given that is an O(n^2) operation, perhaps we limit subtype reduction to unions with 500 or less constituents.

[ahejlsberg]

Oops, meant to close the old PR, not the issue.