chore(ts-sdk): migrate to eslint 10 and @typescript-eslint v8

[adnanrhussain]

Summary

Dependabot opened three PRs that individually can't merge because they share a peer-dep conflict (@typescript-eslint/eslint-plugin@6 only supports eslint@^7 || ^8, blocking the ESLint 10 bump):

• chore: bump eslint from 8.57.1 to 10.4.0 in /sdks/typescript #69
• chore: bump @typescript-eslint/eslint-plugin from 6.21.0 to 8.59.4 in /sdks/typescript #68
• chore: bump @typescript-eslint/parser from 6.21.0 to 8.59.4 in /sdks/typescript #67

ESLint 10 also removes the legacy .eslintrc config format entirely, so the bump requires a flat-config migration as well. This PR does all four pieces in one coordinated change so the upgrade can actually land.

(Older variants of the same bumps — #45, #54, #55, #56 — are superseded and will close out automatically.)

Changes

• Bumped eslint 8.56 → 10.4, @typescript-eslint/{eslint-plugin,parser} 6.19 → 8.59 (latest stable for all)
• Added @eslint/js and globals (required by flat config)
• Replaced .eslintrc.cjs with eslint.config.js (flat config)
• Updated lint script: eslint src tests --ext .ts → eslint "src/**/*.ts" "tests/**/*.ts" (--ext removed in ESLint 9+)
• Disabled the base no-redeclare rule (doesn't understand TS type/value pattern used in zod schemas)
• Removed two stale eslint-disable directives that v10 correctly reports as unused

Testing

All gates green locally:

• npm run lint
• npm run typecheck
• npm run build
• npm run test:unit
• npm run test:coverage

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR consolidates the TypeScript SDK’s linting-toolchain upgrades by migrating to ESLint v10 and @typescript-eslint v8, including the required move from legacy .eslintrc to ESLint flat config so dependency/peer-dep conflicts can be resolved cleanly.

Changes:

• Upgraded eslint to v10 and @typescript-eslint/{eslint-plugin,parser} to v8, adding flat-config dependencies (@eslint/js, globals).
• Replaced .eslintrc.cjs with eslint.config.js and updated the lint script for ESLint 9+ CLI semantics.
• Removed now-unused eslint-disable directives that ESLint v10 flags as unused; disabled base no-redeclare to avoid TS type/value false positives.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sdks/typescript/src/batch/evaluator.ts	Removes an unused eslint-disable directive now reported by ESLint v10.
sdks/typescript/src/batch/csv.ts	Removes an unused eslint-disable directive now reported by ESLint v10.
sdks/typescript/package.json	Bumps ESLint + TypeScript-ESLint deps, adds flat-config deps, updates lint script.
sdks/typescript/package-lock.json	Lockfile updates for the dependency upgrades.
sdks/typescript/eslint.config.js	Introduces ESLint flat config for TS + Node globals and TS-eslint rules.
sdks/typescript/.eslintrc.cjs	Removes legacy ESLint config (flat-config migration).

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