Description

Mohamed Hegazy (mhegazy)

opened on Mar 26, 2015

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The compiler does not do emit based on semantic information in most cases. this allows us to provide an api for transpiling a module that does not require typecheck or full program information. just single file syntactic transformation.
This can be helpful in multiple scenarios, including: typescript-simple (https://github.com/teppeis/typescript-simple), JSPM (#2233), es6-module-loader and as atom extensions.

A new compiler flag (--singeFileTranspilation or --disableFullProgramOptimizations for instance) that will make cases that break single file-transpilation an error namely: 1.Const enums defined in ambient modules and 2.Re-exporting types-only constructs when targeting ES6

Reacted by Herrington Darkholme

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1. Mohamed Hegazy (mhegazy)

   added

   SuggestionAn idea for TypeScriptAn idea for TypeScript

   In DiscussionNot yet reached consensusNot yet reached consensus

   Domain: APIRelates to the public API for TypeScriptRelates to the public API for TypeScript

   on Mar 26, 2015
2. sophiajt commented on Mar 26, 2015

   

   Sophia J. Turner (sophiajt)

   on Mar 26, 2015

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   👍 though we need a good name for the flag :)
3. Mohamed Hegazy (mhegazy)

   added this to the TypeScript 1.5 milestone on Mar 31, 2015
4. Mohamed Hegazy (mhegazy)

   assigned

   Vladimir Matveev (vladima)

   on Mar 31, 2015
5. vladima commented on Mar 31, 2015

   

   Vladimir Matveev (vladima)

   on Mar 31, 2015

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   Proposed implementation #2550.
   Regarding the name of the flag: we've already had a long discussion about possible names but all options were non-ideal, Some names that we've tried are: 'separateCompilation', 'singleFileEmit', 'disablGlobalOptimizations', 'safeForTranspile', 'isolated', 'singleFileScope' - we could not pick one since all of them were equally bad. What about moving from the boolean flag and instead have an enum named 'compilationMode' or 'compilationUnit' or something similar? Enum values will be 'program' and 'file' and 'program' will be default.

   tsc a.ts b.ts --compilationUnit: file
6. Mohamed Hegazy (mhegazy)

   modified the milestones: TypeScript 1.5, This milestone has been deleted on Apr 23, 2015
7. Sophia J. Turner (sophiajt)

   changed the title [-]Support single-module transplantation mode[/-] [+]Support single-module transpilation mode[/+] on Apr 28, 2015
8. Ciantic commented on May 3, 2015

   

   Jari Pennanen (Ciantic)

   on May 3, 2015

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   Visual Studio Code does not transpile on save. And I suppose it's because TSC does not implement this. It's major pain to transpile and compile all files each time, it causes a lot of file changes and triggers many webpack/browserify processes, time from edit to F5 is really big.

   Only tool doing single file transpiling at the moment is atom-typescript, but it's not using TSC for that.

   Btw, it probably should be called "--singleModuleTranspile" because single file transpile is not same thing, if I understod this right.
9. mhegazy commented on May 5, 2015

   

   Mohamed Hegazy (mhegazy)

   on May 5, 2015

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   Vladimir Matveev (@vladima) we will need another check for reexporting type-only names in ES6 and in singleFile mode. we also need to update the name of the flag after the next desing meeting discussion.
10. mhegazy commented on May 19, 2015

    

    Mohamed Hegazy (mhegazy)

    on May 19, 2015

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    PR #3208 renames the flag to --isolatedModules
11. Ryan Cavanaugh (RyanCavanaugh)

    added

    CommittedThe team has roadmapped this issueThe team has roadmapped this issue

    and removed

    In DiscussionNot yet reached consensusNot yet reached consensus

    on May 19, 2015
12. mhegazy commented on May 22, 2015

    

    Mohamed Hegazy (mhegazy)

    on May 22, 2015

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    The flag has been renamed to --isolatedModules see PR #3208 for more details.
13. Mohamed Hegazy (mhegazy)

    closed this as completedon May 22, 2015
14. microsoft

    locked and limited conversation to collaborators on Jun 18, 2018
15. TypeScript Bot (typescript-bot)

    unassigned

    Vladimir Matveev (vladima)

    on Jun 18, 2018

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