microsoft / microsoft/TypeScript
fourslash test breaks when setting "@lib"
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Description
TypeScript Version: master
Code
/// <reference path="fourslash.ts" />
// @lib: es2015
////function f(x: number[]) { return x.length; }
verify.noErrors();
Expected behavior:
No error.
Actual behavior:
Error: At line 1, col 0: Found an error: /tests/cases/fourslash/quickInfoBar.ts@35: Property 'length' does not exist on type '{}'.
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
Start with the fourslash test that sets // @lib: es2015 and the reported tests/cases/fourslash/quickInfoBar.ts location. Reproduce the case and trace why x is treated as {} when checking x.length. Done means the shown test passes with no error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers, testing
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100