[obvious-autobuild-staging]

Why

Global number and JSON literal parsing (Parse numbers, Parse JSON) works well for uniform tables, but real-world CSVs frequently mix numeric postal codes or numeric IDs (90210, 1001) that must stay strings alongside numeric amount columns, or contain yes/no / 1/0 columns that should emit JSON booleans. Previously, users had to toggle global Parse numbers off for the entire dataset or manually edit the JSON output.

What

• Per-column type overrides in app/src/lib/convert.ts (AC-16 / D15):
  • Exported ColumnTypeOverride = "auto" | "string" | "number" | "boolean" and extended ConverterOptions / Csv2JsonOptions with optional columnTypes?: Record<string, ColumnTypeOverride>.
  • Applied per-column overrides in applySmartValues before global pass(v) rules while preserving emptyFields: "skip" and nullLiterals: "null" precedence:
    • "string" keeps the cell as a raw string even when global parseNumbers or parseJSON is enabled.
    • "number" coerces numeric strings via toSmartNumber even when global parseNumbers is disabled.
    • "boolean" coerces case-insensitive true/false/1/0/yes/no to booleans and preserves unrecognized strings.
    • "auto" falls through to the global smart pass.
• Contextual selection toolbar pills & header badges in CsvTable.tsx:
  • When one or more columns are selected in the editable CSV → JSON input table, the selection toolbar renders Type: Auto · String · Number · Boolean (data-testid="input-table-column-type-{auto|string|number|boolean}") with aria-pressed state.
  • Pinned columns display a compact header badge ([STR], [NUM], [BOOL]) in the grid column title and surface a contextual "N column types pinned" reset chip (data-testid="input-table-column-types-reset") in the table toolbar.
  • Renaming a column header preserves its pinned type override under the new header name; clearing the input resets columnTypes.
• Recent history & changelog:
  • Preserved columnTypes in recentHistory.ts snapshots and added bundled changelog entry #18.

How to Review

• app/src/lib/convert.ts & app/src/lib/__tests__/convert.test.ts: per-column coercion logic and composition with array/hash modes, emptyFields, and nullLiterals.
• app/src/components/CsvTable.tsx & app/src/components/CsvTable.test.tsx: selection toolbar segmented control, header badge rendering, header rename migration, and reset chip.
• app/src/App.tsx, app/src/components/InputPane.tsx, & app/src/App.test.tsx: end-to-end state wiring and reset on Clear.

Test Evidence

AC-16: Per-column type overrides (Auto · String · Number · Boolean) in CsvTable selection toolbar with header badges and reset chip

• cd app && npm run lint && npx tsc -b --noEmit && npm test && npm run build (33 test suites, 562 tests passing)
• bash .github/scripts/verify-seo.sh (prerendered HTML check passing)
• Interactive agent-browser verification at 1440×900 attached via autobuild-qa.

Human author: David Boskovic (david@obvious.ai)

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