TypeError: Cannot read property 'indexOf' of null
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- Dominant language
- JavaScript
- Stars
- 3.7k
- Forks
- 370
- PR merge metrics
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Description
Without using typescript or looking at the type declaration, the parameter obtained from http get query, which is passed into the originalPositionFor method as a string without processing, will result in null mapping. Then sourceContentFor will cause an error.
It is recommended that the display of the library author be converted to number, otherwise it will take a long time to check the problem and it is difficult to locate it. thank you!
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 at the originalPositionFor and sourceContentFor entry points and reproduce the failure with a string obtained from an HTTP GET query. Trace the null mapping into sourceContentFor, then add coverage for the query-derived input and verify that the lookup no longer raises the reported TypeError.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100