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32 lines
3.3 KiB
Markdown
32 lines
3.3 KiB
Markdown
# Improvements to JavaScript analysis
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## General improvements
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* Support for popular libraries has been improved. Consequently, queries may produce more results on code bases that use the following features:
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- client-side code, for example [React](https://reactjs.org/)
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- cookies and webstorage, for example [js-cookie](https://github.com/js-cookie/js-cookie)
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- server-side code, for example [hapi](https://hapijs.com/)
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* File classification has been improved to recognize additional generated files, for example files from [HTML Tidy](html-tidy.org).
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* The taint tracking library now recognizes flow through persistent storage, this may give more results for the security queries.
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## New queries
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| **Query** | **Tags** | **Purpose** |
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|-----------------------------------------------|------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| Double escaping or unescaping (`js/double-escaping`) | correctness, security, external/cwe/cwe-116 | Highlights potential double escaping or unescaping of special characters, indicating a possible violation of [CWE-116](https://cwe.mitre.org/data/definitions/116.html). Results are shown on LGTM by default. |
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| Incomplete URL substring sanitization | correctness, security, external/cwe/cwe-020 | Highlights URL sanitizers that are likely to be incomplete, indicating a violation of [CWE-020](https://cwe.mitre.org/data/definitions/20.html). Results shown on LGTM by default. |
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| Incorrect suffix check (`js/incorrect-suffix-check`) | correctness, security, external/cwe/cwe-020 | Highlights error-prone suffix checks based on `indexOf`, indicating a potential violation of [CWE-20](https://cwe.mitre.org/data/definitions/20.html). Results are shown on LGTM by default. |
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| Useless comparison test (`js/useless-comparison-test`) | correctness | Highlights code that is unreachable due to a numeric comparison that is always true or always false. Results are shown on LGTM by default. |
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## Changes to existing queries
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| **Query** | **Expected impact** | **Change** |
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|--------------------------------------------|------------------------------|------------------------------------------------------------------------------|
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| Client-side cross-site scripting | More results | This rule now recognizes WinJS functions that are vulnerable to HTML injection. |
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| Insecure randomness | More results | This rule now flags insecure uses of `crypto.pseudoRandomBytes`. |
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| Unused parameter | Fewer false-positive results | This rule no longer flags parameters with leading underscore. |
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| Unused variable, import, function or class | Fewer false-positive results | This rule now flags fewer variables that are implictly used by JSX elements, and no longer flags variables with leading underscore. |
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## Changes to QL libraries
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