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@sandersn sandersn commented May 11, 2018

Fixes exponential merging behaviour of special js initialisers. Some baselines change because it fixes some previously incorrect merged symbol structure.

I have not tested it with Visual Studio, but it's basically the same as the fix we had working this afternoon, except that it doesn't break any of our existing tests.

Fixes #24015

sandersn added 2 commits May 10, 2018 16:51
Still doesn't work correctly for multiple merges
@RyanCavanaugh
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Porting to 2.8

@RyanCavanaugh
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Bug is #24015

RyanCavanaugh added a commit to RyanCavanaugh/TypeScript that referenced this pull request May 11, 2018
@RyanCavanaugh
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Since we don't need this fix in master ASAP, let's get some test cases / asserts added to this PR. I'm running manual VS tests in the 2.8 port branch

billti added a commit that referenced this pull request May 11, 2018
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I added a test case and an assert that immediately catches the problem (1) in compilation (2) in fourslash (3) in interactive VS Code usage, so I think this is ready to go.

@RyanCavanaugh
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Looks good. Can you add another fourslash test for the other repro we got?

@mhegazy mhegazy merged commit cc36cfc into master May 11, 2018
@mhegazy mhegazy deleted the fix-js-initializer-merging branch May 11, 2018 17:45
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@RyanCavanaugh can you send me the other minified repro? Since we didn't change the definition of getJSInitializerSymbol, and the binder code that creates symbols based on getJSInitializer is a single code path, I don't think it will prove anything new, but the cost of adding a second test is low.

Note that without the fix the assert fires for existing tests too: to wit, the ones that had changed baselines.

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The two repros I have are

// file1.js
blah.prototype = {
    m: "q"
};

// file2.d.ts
declare class blah { }

and

// file1.js
var N = {};
N.X = function() { };

// file2.d.ts
declare namespace N {
    class X { }
}

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Symbol table corruption leads to runaway memory usage

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