chore: deprecate renderNs() and processInner() ahead of 7.0

[cjbarth]

Refs #618.

7.0 makes renderNs() and processInner() private on C14nCanonicalization and ExclusiveCanonicalization, and drops the prefix-name fallback that #615 kept for callers of the old renderNs() signature. Nothing in 6.x says so: renderNs() carries only @api private, and both methods are in the published types. This PR is the 6.x deprecation that has to come first.

• @deprecated on both methods of both classes, naming process() as the replacement.
• A DeprecationWarning, XML_CRYPTO_CANONICALIZATION_INTERNALS, once per process, when either method is called from outside process(), or when a subclass overrides one.
• README: a paragraph under "Deprecated ahead of 7.0".

Nothing changes for a caller of process(), and no output changes.

How the warning tells an outside caller from the library

process() has to keep calling this.renderNs() and this.processInner(): routing it through private copies would stop a subclass's override from taking effect, which is a behavior change in a minor. So the methods can't warn on every call. Instead:

• process() records that it is running for the instance, and the two methods warn only when it isn't. That is a direct call from outside. A process() call nested inside another on the same instance leaves the outer call's record in place, so a subclass that calls process() from one of its own methods gets no warning for that.
• process() warns when the instance's renderNs or processInner is not the class's own. That is an override, and it is detected whether or not the override calls super.

The four internal call sites in each class carry eslint-disable-next-line deprecation/deprecation, as the internal call in signed-xml.ts does. They go away with the tag in 7.0.

Tests

The warning has no test, like the other deprecations. Five tests pin what 6.x still has to honor until the methods go private, two for each class and one more for C14nCanonicalization:

• processInner() called directly returns what process() returns.
• process() uses a subclass's override of renderNs().
• process() returns the same canonical form when a subclass calls it again from inside it.

Checks

• npm run build && npm test && npm run lint pass (555 tests).
• With the built library: process() on all four canonicalization classes prints nothing. A direct processInner() call prints the warning, and so does process() on a subclass that overrides renderNs(). A subclass that overrides only renderAttrs() and calls process() from it prints nothing; before the nested-call fix it printed the warning.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Clarified that renderNs() and processInner() are deprecated and scheduled to become private in version 7.0. Use process() instead.
• Behavior Changes
  • Calling either method directly or overriding it in a subclass now prints a deprecation warning. Both methods remain available until version 7.0.
• Tests
  • Added coverage confirming that direct calls and subclass overrides remain compatible.

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• README.md
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📝 Walkthrough

Both canonicalization classes now warn when renderNs() or processInner() is called outside process() or overridden. The README documents the deprecation and planned privacy in 7.0. Tests cover direct calls, overrides, and reentrant processing.

Changes: Canonicalization deprecation warnings

Layer / File(s)	Summary
Shared process tracking src/utils.ts	Utilities track calls during process(), detect overrides, and warn when deprecated methods are called outside a tracked process.
Canonicalization integration and compatibility src/c14n-canonicalization.ts, src/exclusive-canonicalization.ts, test/c14n-non-exclusive-unit-tests.spec.ts, test/canonicalization-unit-tests.spec.ts, README.md	Both classes mark renderNs() and processInner() as deprecated, warn on external calls, and use the tracking utility in process(). Tests cover direct calls, overrides, and reentrant processing. The README states that the methods are planned to become private in 7.0.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~15 minutes

Change: Other

Suggested reviewers: shunkica

Merge Risk: ⚪ Minimal · up to 58a67

Merge Risk: ⚪ Minimal · up to 58a67

This change adds a once-per-process deprecation warning for external use of renderNs() and processInner(), and for subclass overrides of them. The behavior of process() is unchanged. No concrete merge-blocking risk was found.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 5 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: deprecating renderNs() and processInner() before version 7.0.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 5 files. (1 skipped: 1 unsupported.)

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Inline comments:
Review comments at @src/utils.ts:
- Line 645: Update the `process()` cleanup around `canonicalizationsInProcess`
to preserve tracking while an outer call remains active: remove the instance
only when this invocation added it, or track nested-call depth, so an inner
`process()` call cannot trigger a false deprecation warning during the outer
call.

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📒 Files selected for processing (6)

• README.md
• src/c14n-canonicalization.ts
• src/exclusive-canonicalization.ts
• src/utils.ts
• test/c14n-non-exclusive-unit-tests.spec.ts
• test/canonicalization-unit-tests.spec.ts

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.33%. Comparing base (557dfff) to head (58a6799).

Files with missing lines	Patch %	Lines
src/utils.ts	70.58%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #656      +/-   ##
==========================================
- Coverage   86.49%   86.33%   -0.17%     
==========================================
  Files           9        9              
  Lines        1296     1317      +21     
  Branches      337      340       +3     
==========================================
+ Hits         1121     1137      +16     
- Misses        100      102       +2     
- Partials       75       78       +3     

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