Upgrade to TypeScript 6, enable strict mode, remove leetcode folders#253
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- Remove all leetcode/ folders (10 directories)
- Bump typescript 5.9.2 -> 6.0.3
- Add @types/node for Node.js globals (console, process, etc.)
- Enable strict: true in tsconfig.json (was commented out)
- Add types: ["node"] to tsconfig.json
- Fix TS2300/TS2451: add export {} to script-style files that had
duplicate global identifiers (08-typescript.ts, 11-array-chunking.ts,
13-remove-duplicates.ts, 14-array-rotation.ts)
- Fix TS2345: type reduceRight initial value in 05-transforming-array.ts
- Fix TS2322/TS7006: add explicit types in 07-multidimensional-arrays.ts
- Fix TS2538/TS2532: guard pop() result before use in decimal-to-base.ts
and decimal-to-binary.ts
- Fix TS2339: replace .toString() with String() on unconstrained generics
in stack.ts, queue.ts, deque.ts, linked-list.ts, doubly-linked-list.ts,
hash-table.ts
- Fix TS7034/TS7005: type queue variable in queue.test.ts
- Fix TS2564/TS18047/TS2322: unify node pointers on null (not undefined),
initialize head/tail/next to null, add null guards in linked-list.ts,
doubly-linked-list.ts, circular-linked-list.ts
- Fix TS7006/TS7015: type hash function parameters in hash-table.ts
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Summary
Adopts TypeScript 6 properly — no shortcuts, no
@ts-ignore, noanycasts.Changes
Removed
leetcode/folders (26 files deleted)Dependencies
typescript5.9.2→6.0.3@types/nodeadded (providesconsole,process, etc. for Node.js)tsconfig.json"strict": true— uncommented (was commented out; TS 6 enables it by default anyway, now it's explicit)"types": ["node"]— added for Node.js globalsoutDirlineSource fixes (by error category)
export {}to script-style files (08-typescript.ts,11-array-chunking.ts,13-remove-duplicates.ts,14-array-rotation.ts) to give each file its own module scopeanylet queue: Queue<unknown>, typed lambda params inhash-table.ts, typed array param inmultidimensional-arrays.ts).toString()on unconstrained genericT.toString()calls withString()instack.ts,queue.ts,deque.ts,linked-list.ts,doubly-linked-list.ts,hash-table.ts—String()works on any valuehead,tail,nexttonullin all three linked-list classesnullnullvsundefinedmismatch| null(was inconsistently mixingnullandundefined)undefinedbefore index/callpop()result guards indecimal-to-base.tsanddecimal-to-binary.tsreduceRightinitial value type in05-transforming-array.ts; fixed array type annotations in07-multidimensional-arrays.tsand13-remove-duplicates.tsNumber()on hash key before indexing inhash-table.tsVerification