[Autoloop] [Autoloop: build-tsb-pandas-typescript-migration]

[github-actions]

Automated optimization iteration for the build-tsb-pandas-typescript-migration program.

Iteration 264 — Add Styler (DataFrame.style API)

Ports pandas.DataFrame.style / pandas.io.formats.style.Styler to TypeScript.

Changes

• src/stats/style.ts — New Styler class + dataFrameStyle() factory (~1250 lines)

  • Full fluent chaining API mirroring pandas Styler
  • format / formatIndex / setPrecision / setNaRep
  • apply (axis-wise) / applymap / map (element-wise)
  • highlightMax / highlightMin / highlightNull / highlightBetween
  • backgroundGradient / textGradient / barChart
  • setCaption / setTableStyles / setTableAttributes / setProperties
  • hide (index or columns)
  • toHtml / render / toLatex
  • exportStyles / clearStyles
  • Color helpers: WCAG luminance/contrast, named colormaps (RdYlGn, Blues, coolwarm, etc.)
  • Lazy CSS rebuild architecture (no mutable CSS grid state)

• tests/stats/style.test.ts — 50+ test cases: unit + property-based (fast-check)

• playground/style.html — Interactive tutorial with full API reference and pandas equivalence table

• src/stats/index.ts + src/index.ts — Export wiring

• playground/index.html — Feature card added

Metric

134 → 135 exported feature files

Related

Closes #1 (ongoing — program issue for this optimization loop)

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⚠️ This PR was created by an automated agent. Review before merging.

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[github-actions]

Commit pushed: 332174e

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[github-actions]

Evergreen Fix ✅

Fixed failing Test & Lint CI check on this PR.

Root cause: src/stats/style.ts contained a duplicate, incomplete highlightMin method definition (lines 721–728) that was never closed. This opened a { without a matching }, causing TypeScript to parse all subsequent class method declarations as statements inside the unclosed function body, producing ~40 syntax errors (TS1005: ',' expected, TS1109: Expression expected, etc.).

Fix: Removed the 8-line duplicate/partial method start. The complete highlightMin implementation immediately following was unaffected.

tsc --noEmit now passes cleanly.

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Commit pushed: 6218e88

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Evergreen: CI Fix Applied 🔧

Fixed the failing Test & Lint check by resolving Biome lint/format errors introduced in the Styler iteration.

Changes made:

• src/stats/style.ts — Fixed 6 lint errors:
  • useTemplate: converted string concatenation to template literals (lines 195, 1204, 1223)
  • noUnusedTemplateLiteral: removed unnecessary template literals (lines 1187, 1232)
  • useExponentiationOperator: Math.pow(x, y) → x ** y (line 272)
  • Applied formatter to match biome's lineWidth: 100 and style rules
• tests/stats/style.test.ts — Applied biome formatter fix (format error)
• src/core/frame.ts, src/core/series.ts — rec["key"] → rec.key (literal key access)
• src/stats/resample.ts, tests/testing/testing.test.ts — Minor formatter fixes (single-line if → block form)

All fixes are safe/semantically equivalent. Biome now reports 0 errors (warnings only, which don't fail CI).

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Commit pushed: 8fcc913

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Evergreen fix applied ✅

The Test & Lint CI failure was caused by 7 TypeScript TS4111 errors — properties from index signatures being accessed with dot notation instead of bracket notation. Fixed in commit e184169:

• src/core/frame.ts:782 — rec.size, rec.at, rec.getLoc → bracket notation
• src/core/series.ts:1039 — same three properties
• src/stats/style.ts:260 — COLORMAPS.Blues → COLORMAPS["Blues"]

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[mrjf]

@copilot fix tests

[Copilot]

@copilot fix tests

Fixed in c879b3a. The mergeCss helper was stripping trailing semicolons from CSS property strings, so tests checking for e.g. "color: red;" were failing even though the CSS was otherwise correct. Updated mergeCss to preserve trailing semicolons in non-empty output — all 59 style tests now pass.

[mrjf]

@copilot fix tests

[Copilot]

@copilot fix tests

Fixed in 2477cb9. The CI "Test & Lint" job was failing due to Biome format errors in src/core/frame.ts and src/core/series.ts — a previous commit had switched to bracket notation (rec["getLoc"]) to satisfy TypeScript's noPropertyAccessFromIndexSignature, but that made those lines exceed the 100-char line limit. Broke the expressions across multiple lines to satisfy the formatter. Lint, typecheck, and all tests now pass.