microsoft / microsoft/TypeScript
Omit producing "JavaScript heap out of memory" with v3.3
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Description
TypeScript Version: 3.4.0-dev.201xxxxx
- 3.3.0-rc
- 3.3.3333
- 3.4.0-dev.20190223
Search Terms:
Omit
Code
// using "@types/react": "^16.8.4"
type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
type XXX = Omit<React.HTMLAttributes<HTMLElement>, 'title'>; // <= this alias is not working
Expected behavior:
It should work as early versions, last tested v3.2.4
Actual behavior:
Compiler throws "JavaScript heap out of memory" and same happens with VSCode Intellisense (stuck for minutes without proper answer).
Playground Link:
Tested code working with playground 3.3. (pasting @types/react at bottom), too big to share.
Related Issues:
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
The issue provides no repository file or test entry point. Start by reproducing the Omit<T, K> alias with @types/react under TypeScript 3.3/3.4 and compare it with 3.2.4; done means compilation and VSCode IntelliSense no longer exhaust the JavaScript heap.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- react, typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100