rules:
- id: zlib-async-loop
  patterns:
  - pattern-either:
    - pattern-inside: |
        for (...) {
            ...
        }
    - pattern-inside: |
        while (...) {
            ...
        }
    - pattern-inside: |
        do {
            ...
        } while (...)
    - pattern-inside: |
        $SMTH.forEach(...)
    - pattern-inside: |
        $SMTH.map(...)
    - pattern-inside: |
        $SMTH.reduce(...)
    - pattern-inside: |
        $SMTH.reduceRight(...)
  - pattern: zlib.$METHOD(...);
  - metavariable-regex:
      metavariable: $METHOD
      regex: ^.+$(?<!Sync)
  message: >-
    Creating and using a large number of zlib objects simultaneously
    can cause significant memory fragmentation. It is strongly recommended
    that the results of compression operations be cached or made synchronous
    to avoid duplication of effort.
  metadata:
    references:
    - https://nodejs.org/api/zlib.html#zlib_threadpool_usage_and_performance_considerations
    category: best-practice
    technology:
    - javascript
  severity: WARNING
  languages: [javascript, typescript]