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

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🤖 This PR is maintained by Autoloop. Each accepted iteration adds a commit to this branch.

Summary

Program goal: Build tsb — a complete TypeScript port of pandas, one feature at a time.

Current best metric: 137 pandas_features_ported (↑ from 136)

Program issue: #1

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Iteration 296 — hashPandasObject

Added hashPandasObject(obj, options?) — mirrors pandas.util.hash_pandas_object.

• src/stats/hash_pandas_object.ts — FNV-1a 64-bit hashing for Series and DataFrame.
  • Series: one hash per element (optionally including the index label)
  • DataFrame: one hash per row (all columns concatenated, optionally with index)
  • index option (default true) controls whether the index label is mixed into the hash
• tests/stats/hash_pandas_object.test.ts — 20+ unit + property-based tests
• playground/hash_pandas_object.html — interactive tutorial page
• Exported from src/stats/index.ts and src/index.ts

Metric: 137 (was 136, +1)

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[mrjf]

@copilot fix tests

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Commit pushed: c6462da

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Evergreen fix applied ✅

Fixed TypeScript error in src/stats/hash_pandas_object.ts:

• dtype: "float64" (string literal) → dtype: Dtype.float64 (proper Dtype instance)
• Added missing import { Dtype } from "../core/dtype.ts"

This resolves TS2322: Type 'string' is not assignable to type 'Dtype' at lines 186 and 208.

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[Copilot]

@copilot fix tests

The tests were failing because dependencies weren't installed (fast-check was missing). Running bun install resolved it — all 24 tests in hash_pandas_object.test.ts and all 5636 tests in the full suite now pass.

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Commit pushed: 5e55e96

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🟢 Evergreen: CI fix applied

Fixed 12 lint errors in src/stats/hash_pandas_object.ts and tests/stats/hash_pandas_object.test.ts:

• noParameterAssign (7 errors): Used local variable h instead of reassigning the hash function parameter in fnvString and fnvScalar
• noNonNullAssertion: Replaced bytes[i]! with bytes[i] ?? 0
• useImportType: DataFrame is only used as a type (overload signatures), made it import type
• organizeImports + format: Auto-fixed by Biome

Commit: 77ac4877aebe133f482b9a3d0e72945aef9c337f

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Commit pushed: 7193c02

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Evergreen fix: Rewrote playground/hash_pandas_object.html to conform to the interactive playground standards.

Root cause: The page was a static HTML documentation page lacking the required interactive playground structure that tests/playground.test.ts (from main) validates on all PR merges.

Fix: Converted the static page to a full interactive playground with:

• #playground-loading overlay
• Dark-theme CSS variables (--bg, --accent, etc.)
• Multiple .playground-block sections with .playground-editor, .playground-run button, and .playground-output elements
• playground-runtime.js ES module script tag

All 7 failing conformance checks should now pass.

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