feat(string): add strTruncate,strCount strAt and strMatchAll helpers, shared literal regex helper, and coverage

[nev21]

• strTruncate: Truncate strings to maximum length with optional suffix support

  • Preserves hard max length boundary (suffix included within limit)
  • Truncates suffix if needed to maintain max length constraint
  • Type coercion via asString(); throws for null/undefined

• strCount: Count non-overlapping substring occurrences

  • Returns 0 for empty search strings (prevents unbounded matches)
  • Type coercion via asString(); throws for null/undefined

• add strAt and polyStrAt

• add strMatchAll and polyStrMatchAll

• wire String.at and String.matchAll polyfills

• add createLiteralRegex and export it

• refactor replace_all and match_all to use createLiteralRegex for literal matcher handling

• add createIterableIterator and export it

• update public exports for new non-polyfill APIs and keep polyStrReplaceAll in the polyfill export section

[codecov]

Codecov Report

❌ Patch coverage is 99.25926% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.86%. Comparing base (43becdc) to head (9851089).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/polyfills.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #530      +/-   ##
==========================================
+ Coverage   98.83%   98.86%   +0.03%     
==========================================
  Files         138      140       +2     
  Lines        4019     4147     +128     
  Branches      859      892      +33     
==========================================
+ Hits         3972     4100     +128     
  Misses         47       47              

Files with missing lines	Coverage Δ
lib/src/helpers/regexp.ts	100.00% <100.00%> (ø)
lib/src/iterator/create.ts	100.00% <100.00%> (ø)
lib/src/string/at.ts	100.00% <100.00%> (ø)
lib/src/string/match_all.ts	100.00% <100.00%> (ø)
lib/src/string/replace_all.ts	100.00% <100.00%> (ø)
lib/src/polyfills.ts	53.06% <50.00%> (+1.99%)	⬆️

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[Copilot]

Pull request overview

Adds several new string helpers and supporting infrastructure to @nevware21/ts-utils, including String.at / String.matchAll wrappers + polyfills, plus shared helpers and updated exports/tests/size limits.

Changes:

• Added strAt/polyStrAt and strMatchAll/polyStrMatchAll, and wired them into the global polyfills loader.
• Introduced reusable helpers (createLiteralRegex, createIterableIterator) and refactored replaceAll to use the literal-regex helper.
• Expanded/added tests and updated bundle size thresholds/docs accordingly.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
lib/test/src/common/string/truncate.test.ts	Minor test formatting update (blank line changes).
lib/test/src/common/string/match_all.test.ts	New tests for strMatchAll/polyStrMatchAll incl. native parity checks.
lib/test/src/common/string/at.test.ts	New tests for strAt/polyStrAt incl. native parity checks.
lib/test/src/common/helpers/regexp.test.ts	Adds test coverage for createLiteralRegex.
lib/test/bundle-size-check.js	Updates bundle-size thresholds used by test tooling.
lib/src/string/replace_all.ts	Refactors literal string matcher handling to createLiteralRegex and expands docs.
lib/src/string/match_all.ts	New matchAll helper + polyfill using iterators and literal-regex handling.
lib/src/string/at.ts	New at helper + polyfill built on polyArrAt + mathToInt.
lib/src/polyfills.ts	Registers at and matchAll polyfills on String.prototype.
lib/src/iterator/create.ts	Adds createIterableIterator export for combined Iterator+Iterable objects.
lib/src/index.ts	Exports new helpers and new helper exports (createLiteralRegex, createIterableIterator).
lib/src/helpers/regexp.ts	Adds createLiteralRegex helper implementation + docs.
docs/feature-backlog.md	Updates backlog to reflect implemented string methods.
.size-limit.json	Updates size-limit thresholds for built artifacts.

[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 5 comments.

[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

[nevware21-bot]

Approved by nevware21-bot

[Copilot]

Pull request overview

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

lib/src/string/replace_all.ts:90

• The updated docs say searchValue can be "any object with a [Symbol.replace] method", and the implementation does support that, but the TypeScript signature still limits searchValue to string | RegExp. Either widen the type so TS consumers can use the documented behavior, or adjust the docs to reflect the intended typed API.

/*#__NO_SIDE_EFFECTS__*/
export function polyStrReplaceAll(value: string, searchValue: string | RegExp, replaceValue: string | ((substring: string, ...args: any[]) => string)): string {
    _throwIfNullOrUndefined(value);

[nevware21-bot]

Approved by nevware21-bot

[nevware21-bot]

Approved by nevware21-bot