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@johnsoncodehk johnsoncodehk released this 29 Apr 05:05
· 48 commits to master since this release
v3.1.0
3c3cf1e

A from-the-ground-up reimplementation of @tsslint/compat-eslint and
a perf overhaul of the @tsslint/core hot path. Public API is unchanged;
you should see meaningfully faster lint and lower memory without
touching your config.

📝 Writeup: Running ESLint rules at 16× speed in TSSLint — https://gist.github.com/johnsoncodehk/dcd318b51b9102da97032abb73b11975
📊 Bench: tsslint-dify-bench

Performance

On Dify web/ (5860 .ts/.tsx, single type-aware rule, shared
ts.Program):

Wall (min of 3) Peak RSS
TSSLint 3.0.4 23.0 s 7.0 GB
TSSLint 3.1 1.5 s 3.75 GB
ESLint Linter 25.0 s 7.0 GB

≈15× faster than the previous release, ≈16× faster than ESLint Linter,
~50% lower peak memory than both.

Architecture

  • @tsslint/compat-eslint no longer depends on the eslint package
    at runtime. CodePathAnalyzer vendored under lib/code-path-analysis/;
    SourceCode reimplemented as LazySourceCode; scope-manager
    rewritten on top of ts.TypeChecker; visitor-keys inlined.
  • Lazy-materialized ESTree shim driven by direct walks over
    ts.SourceFile; most ts.Nodes never become ESTree objects.
  • @tsslint/cli runs on the main thread (dropped worker_threads,
    dropped the live progress spinner).
  • @tsslint/config importESLintRules lazy-loads individual rules
    instead of importing the whole plugin module graph.

Diagnostic accuracy

  • no-undef false positives on cross-file declaration merging cut
    ~92% on TypeScript-repo measurement (lib redeclarations,
    declare module augmentations, interface+namespace merges).
  • Phantom VariableDeclarator on catch (e) params removed.
  • JSX entity decoding parity restored across the full 252-entry
    xhtml table (  → U+00A0 not 0x20, etc.).
  • ~15 lazy-estree shape parity gaps closed.

Internal API

  • @tsslint/core: removed the syntax-only fast path. Only matters
    if you consume @tsslint/core directly. CLI / typescript-plugin
    / VSCode extension users see no change.

Known gaps

A small set of baselined divergences vs ESLint upstream remain — see
packages/compat-eslint/test/bench/baseline.json.
Most are cases where TSSLint follows TypeScript semantics and ESLint
is wrong for TS code (no-redeclare on declaration merging,
enum + interface, etc.).

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