JS: Refactor default import interop #20364
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Co-authored-by: Copilot <[email protected]>
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Pull Request Overview
Refactors the JavaScript module import system to improve overlay locality by making getImportedModuleNode() local while keeping getImportedModule() global. This enables better handling of non-standard default import semantics.
- Introduces
isDefaultImport()andgetImportedModuleNodeIfUnambiguous()predicates for better default import handling - Refactors
getImportedModuleNode()to be overlay-local compatible - Updates API graph logic to use the unambiguous variant where needed
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| javascript/ql/lib/semmle/javascript/Modules.qll | Adds new predicates and refactors getImportedModuleNode() documentation and signature |
| javascript/ql/lib/semmle/javascript/ES2015Modules.qll | Implements default import detection and updates module node resolution logic |
| javascript/ql/lib/semmle/javascript/ApiGraphs.qll | Updates API graph tracking to use unambiguous module node resolution |
Comment on lines
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| pragma[nomagic] | ||
| final DataFlow::Node getImportedModuleNodeIfUnambiguous() { | ||
| result = this.getImportedModuleNode() and | ||
| not ( | ||
| this.isDefaultImport() and | ||
| this.getImportedModule().(ES2015Module).hasBothNamedAndDefaultExports() | ||
| ) | ||
| } |
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[nitpick] The getImportedModuleNodeIfUnambiguous() method lacks documentation explaining the pragma[nomagic] directive and why it's necessary for this predicate.
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For overlay locality, we want
Import.getImportedModuleNode()to be local, without necessarily makingImport.getImportedModule()local.This means
getImportedModuleNode()shouldn't depend ongetImportedModule(), but currently some logic for dealing with non-standarddefaultimport semantics relies on it.This PR refactors
getImportedModuleNode()so it can beoverlay[local], and introducesgetImportedModuleNodeIfUnambiguous()which isoverlay[global]and performs some extra checks to avoid incorrect data flow. Most use-cases can just continue usinggetImportedModuleNode().