build(solidity): raise TypeScript to 5.9.3 in both packages

[mswilkison]

Stacked on #4204. Raises TypeScript in both solidity packages to 5.9.3,
and adds skipLibCheck.

ecdsa was on ^4.5.4 and random-beacon on ^4.4.3 — 4.5.5 and 4.4.3
resolved, both from 2022. Neither had skipLibCheck, so both were type-checking
their dependencies' declarations as well as their own.

Measured

	before	after
ecdsa	TS 4.5.5 — 1 error	TS 5.9.3 — 1 error
random-beacon	TS 4.4.3 — 33 errors	TS 5.9.3 — 21 errors

No new errors in either. random-beacon drops twelve: the newer compiler
resolves inference the old one gave up on, and skipLibCheck takes three
library declarations out of scope (21 of the 24 without it are ours). The 21
that remain are pre-existing and untouched here.

Suites unchanged:

random-beacon	955 passing / 0 pending / 0 failing
ecdsa	673 passing / 44 pending / 0 failing

Why now

Same reason as threshold-network/tbtc-v2#1068 — it is a prerequisite for
replacing waffle, whichever replacement is chosen:

• viem, abitype and ox declare typescript >= 5.0.4 and their declarations
  do not parse on 4.x at all
• ethers v6 with typechain v8 needs it too: typechain types a contract method as
  TypedContractMethod, and a 4.x compiler cannot resolve a conditional type
  against it

Why 5.9 and not 6 or 7

Not 7. It is the native Go port, and yarn 4.12.0 cannot install it here at
all — yarn applies a builtin compat patch expecting lib/_tsc.js, which the Go
port does not ship, so the install aborts in the fetch step. (Yarn 4.17.1
installs it fine, so that is a yarn bump rather than a TypeScript wait.)

Not 6 yet, but that is the one to watch. 6.0.3 is stable and is what
Hardhat 3 develops against (hardhat@3.11.1 dev-depends on typescript: ~6.0.3), so TypeScript 6 is the version to pair with a Hardhat 3 move — not
something to take early and not 7.

Summary by CodeRabbit

• Chores
  • Updated TypeScript tooling for improved compatibility across Solidity projects.
  • Streamlined type-checking by skipping validation of external library declaration files.
  • Preserved existing iteration support settings.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: db0abff3-dd54-4870-ba24-9ca283995934

📥 Commits

Reviewing files that changed from the base of the PR and between a7ac898 and 0072a3c.

⛔ Files ignored due to path filters (2)

• solidity/ecdsa/yarn.lock is excluded by !**/yarn.lock, !**/*.lock
• solidity/random-beacon/yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (4)

• solidity/ecdsa/package.json
• solidity/ecdsa/tsconfig.json
• solidity/random-beacon/package.json
• solidity/random-beacon/tsconfig.json

---

📝 Walkthrough

Walkthrough

The ECDSA and random-beacon Solidity workspaces upgrade their TypeScript development dependency to 5.9.3 and enable skipLibCheck in their TypeScript configurations.

Changes

Solidity TypeScript configuration

Layer / File(s)	Summary
TypeScript tooling and compiler checks solidity/ecdsa/package.json, solidity/ecdsa/tsconfig.json, solidity/random-beacon/package.json, solidity/random-beacon/tsconfig.json	Both workspaces use TypeScript 5.9.3 and enable skipLibCheck. Existing compiler options remain configured.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Mergeability Score: ⚪ Minimal · up to 0072a

This is a localized build-tooling update with unchanged passing test suites and no actionable merge-blocking risk remaining after normal checks and review.

Possibly related PRs

• threshold-network/keep-core#3999: Both PRs modify Solidity workspace package and TypeScript configuration files.

Suggested reviewers: piotr-roslaniec

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the TypeScript upgrade in both Solidity packages.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/solidity-typescript-5

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