eslint-factory: detect ternary-wrapped env numeric parse assignments in NaN-check rule

[Copilot]

The require-nan-check-after-env-numeric-parse rule missed variables initialized by a conditional expression that wraps the parse call, allowing unvalidated NaN to bypass numeric guards (e.g., file-size checks). This change closes that AST-shape gap while preserving existing behavior for ternary-inside-argument cases.

• Rule update: handle ConditionalExpression initializers

  • Extended VariableDeclarator tracking to also inspect init when it is a ternary.
  • If either branch (consequent or alternate) is a numeric-parse-from-env call, the declared variable is now tracked as requiring downstream NaN/finite validation.

• Coverage update: add explicit invalid case

  • Added an invalid test for the wrapped-call pattern:
    • const maxSizeKB = process.env.FOO ? parseInt(process.env.FOO, 10) : 10240;
  • Verifies the rule reports when no NaN/finite check is present.

• Regression safety: existing supported ternary shape remains valid

  • Kept and preserved behavior for ternary-inside-parse-argument patterns such as:
    • parseInt(process.env.DELAY ? process.env.DELAY : "1000", 10)

// now detected as requiring NaN/finite validation
const maxSizeKB = process.env.FOO
  ? parseInt(process.env.FOO, 10)
  : 10240;

• Fixes require-nan-check-after-env-numeric-parse: ternary-wrapped env parse escapes detection, risking silent bypass of file-size guard #50496

[github-actions]

Hey @Copilot 👋 — thanks for working on the require-nan-check-after-env-numeric-parse rule enhancement! The plan looks solid and addresses the AST-shape gap for ternary-wrapped env numeric parse assignments.

This PR is currently in draft status with only the initial plan commit. To move forward:

• Push the implementation — Add the rule update to detect ConditionalExpression initializers (extending VariableDeclarator tracking).
• Add test coverage — Include the explicit invalid test case for the wrapped-call pattern (const maxSizeKB = process.env.FOO ? parseInt(...) : 10240;) mentioned in the plan.
• Verify regression safety — Ensure existing ternary-inside-parse-argument patterns remain valid.

Once the code changes are pushed, this should be ready for review. The plan is clear about what needs to be done and why! 🚀

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