Check and emit fixes for async iteration#15277
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I will cherry-pick these changes into release-2.3 this evening. |
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* Fix yield in async generator * Update with changes from microsoft/TypeScript#15277 * Updated version to 1.6.1. * Updated README.md to use latest version. * Update async generator helpers to align with #15521 * Update README * Update version to 1.7.0 * Update asyncDelegator for TS15862 * Update package version * update jspm instructions This updates the jspm installation instructions to remove `npm:` registry prefix as it is no longer necessary as the package is now mapped in the jspm registry. Additionally. the example `tsconfig.json` now reflects the path corresponding to the latest package version and uses the lowercase module kind name `"system"` to match the other example and to avoid warnings issued by VS Code when `"System"` is specified.
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This changes the emit for the
__asyncGeneratorand__asyncDelegatorhelpers to fix issues withyield*delegation in an async generator. The main change involves modifying__asyncDelegatorto use a two-phase approach to iteration:next/throw/returnto__asyncGeneratoras if it were anawaitand switch phase. After awaiting the result,__asyncGeneratorsends it back to the delegator via a call to itsnextmethod.__asyncGeneratoreither as ayieldor areturnand switch phase.This also addresses a bug in the checker and correctly emits
__asyncValuesin some cases where it was missing.This also addresses an issue where a Promise rejection during delegation of an async iterator was not properly handled.
Fixes: #15143, #14725, and #14442
Related: microsoft/tslib#29