• grid: render y grid when the y axis is hidden (86468cb), closes #4229 #4230

The detailed new feature description can be found at:

billboard.js 4.1.0: Live resizing, configurable subchart, React subpath & CSP-safe worker (dev.to link)

• bar: prevent invalid SVG arc flags on load() with bar.radius (f195b91), closes #4166
• boost: harden worker fallback paths (b4fe41a)
• grid: guard optional grid focus handlers (ce448fb), closes #4205
• plugin-tableview: validate constructor options and warn on invalid input (b98bb3f), closes #4140 by @Loksly
• selection: honor multiple=false and point.focus.only in select API (0b7255c)
• util: Correctly detect empty objects with polluted prototype (78d47ff), closes #4193 by @piotrp

• boost: pre-bundle the worker source and add workerUrl (79aa7ec)
• canvas: support grid line class selectors (61cb9b7), closes #4164
• react: add react subpath export (e801ccf)
• resize: add resize.live to follow the container while resizing (e0309c8), closes #4219
• subchart: add focus grid toggle (2762d02), closes #4176
• subchart: support configurable subchart rendering (37ec4b7), closes #4175

• resize: add resize.live to follow the container while resizing (e0309c8), closes #4219

• grid: guard optional grid focus handlers (ce448fb), closes #4205
• util: Correctly detect empty objects with polluted prototype (78d47ff), closes #4193

• bar: prevent invalid SVG arc flags on load() with bar.radius (f195b91), closes #4166
• boost: harden worker fallback paths (b4fe41a)
• plugin-tableview: validate constructor options and warn on invalid input (b98bb3f), closes #4140
• selection: honor multiple=false and point.focus.only in select API (0b7255c)

• boost: pre-bundle the worker source and add workerUrl (79aa7ec)
• canvas: support grid line class selectors (61cb9b7), closes #4164
• subchart: add focus grid toggle (2762d02), closes #4176
• subchart: support configurable subchart rendering (37ec4b7), closes #4175

• security: escape attribute context in text background filter (ff22a37)

• canvas: skip line points in subchart (3831ec6)
• legend: prevent hidden legend hover from dimming visible legends on canvas (3ae8438), closes #4158 #4159
• tooltip: fix focus point and tooltip for single x-axis (d7cba7f), closes #3968 #4156

• types: add canvas subpath mapping (a6b180a)

The detailed new feature description can be found at:

billboard.js 4.0 release: Canvas rendering mode, 94.3% faster overall in benchmark! (dev.to link)

• background: Correct background image position in canvas (34009de)
• boost: Correct rootSelector typo in CSS scope initialization (a0673ee), closes #4123
• boost: Reuse Worker and Object URL to prevent memory leak (fc812fb), closes #3720
• canvas: address canvas render review issues (70df3f6)
• canvas: align candlestick labels with wick endpoints (b328da4)
• canvas: align rendering and touch interaction parity (5944cab)
• data: Add type check before 'in' operator in JSON dot-notation path resolver (67c00b9), closes #4116
• data: Handle non-array value for data.json (dc5d04c), closes #4103
• types: Add file extensions to types (02c7bf6), closes #4097
• types: Export shape option types from main entry point (#4109) (f4a236a), closes #4104
• util: camelCase SVG tag/attribute matching in sanitizer (631ddc5), closes #4078 #4106
• util: update sanitization function (#4105) (d492644)
• zoom: fix drag zoom boundary release and circle transition desync (00f6859), closes #4131 #4131

• canvas: add canvas rendering mode (200c99e)
• esm: tree-shakable grid, regions, category modules (678e761)
• funnel: Rotate and spline option (7a7bf25), closes #4024
• plugin-tableview: add numberFormat configuration option (2abe355), closes #4140 #4141 by @Loksly

• esm: chart.export() and chart.flow() are no longer included automatically in the ESM build. Explicit import required:

  import bb, { bar, exportApi, flow } from "billboard.js";
  bb.generate({ ...bar(), ...exportApi(), ...flow(), data: { ... } });

UMD bundle users are not affected.

• refactor(esm): remove prototype stubs for export and flow modules

Remove the stub implementations and delete calls that were added as fallbacks — they are unnecessary now that the resolver pattern handles lazy loading directly without stub cleanup.

• feat(esm): make grid, regions, category APIs tree-shakable

• Introduce grid(), regions(), category() resolver modules for opt-in ESM import
• Remove apiGrid, apiRegion, apiCategory from axis resolver
• Remove internal grid/region renderers from axis resolver
• Extend Chart/api/stubs with xgrids/ygrids/regions/category/categories stubs
• Add optional chaining in redraw/eventrect/flow/ChartInternal for grid/region methods
• Update UMD entry to auto-invoke new resolvers
• Update ESM entry to export new resolvers
• Point runtime error docs to new MODULE_IMPORTS.md guide
• Add tests for new optional modules

Add CHANGELOG-v4.md for release notes and MODULE_IMPORTS.md as the canonical module import guide referenced from runtime error messages.

• esm: In ESM builds, chart.xgrids()/ygrids(), chart.regions(), chart.category()/categories() now require explicit import:

  import bb, {bar, grid, regions, category} from "billboard.js";
  grid(); regions(); category();  // run once per app

UMD bundle users are not affected — the UMD entry auto-invokes all resolvers.

• canvas: align candlestick labels with wick endpoints (b328da4)

• plugin-tableview: add numberFormat configuration option (2abe355), closes #4140 #4141