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Load for stacks, bins, groups, rolling windows, ranks, regression, hierarchy, missing values, or reactive transform work.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},"tanstack","TanStack","https:\u002F\u002Fpexgzepcugksgbtrxkhf.supabase.co\u002Fstorage\u002Fv1\u002Fobject\u002Fpublic\u002Forg-logos\u002Ftanstack.png",[12,16,19,22],{"name":13,"slug":14,"type":15},"Data Analysis","data-analysis","tag",{"name":17,"slug":18,"type":15},"Charts","charts",{"name":20,"slug":21,"type":15},"Data Cleaning","data-cleaning",{"name":9,"slug":8,"type":15},608,"https:\u002F\u002Fgithub.com\u002FTanStack\u002Fcharts","2026-08-15T03:47:44.963239",null,40,[29,30,18,31,32,33,34,35,36,37,38,39,40,8,41,42],"accessible-charts","charting-library","d3","data-visualization","dataviz","grammar-of-graphics","javascript","octane","react","responsive-charts","ssr","svg","typescript","visualization",{"repoUrl":24,"stars":23,"forks":27,"topics":44,"description":45},[29,30,18,31,32,33,34,35,36,37,38,39,40,8,41,42],"A tiny TypeScript visualization grammar for responsive, accessible, server-rendered charts—powered by granular D3 primitives.","https:\u002F\u002Fgithub.com\u002FTanStack\u002Fcharts\u002Ftree\u002FHEAD\u002Fpackages\u002Fcharts-core\u002Fskills\u002Fprepare-chart-data","---\nname: prepare-chart-data\ndescription: >\n Order, aggregate, derive, and transform application rows for TanStack\n Charts while preserving semantic units and lineage. Load for stacks, bins,\n groups, rolling windows, ranks, regression, hierarchy, missing values, or\n reactive transform work.\nmetadata:\n type: core\n library: '@tanstack\u002Fcharts'\n library_version: '0.9.0'\nsources:\n - 'TanStack\u002Fcharts:docs\u002Fguides\u002Ftransforms-and-reactivity.md'\n - 'TanStack\u002Fcharts:docs\u002Freference\u002Ftransforms.md'\n - 'TanStack\u002Fcharts:docs\u002Freference\u002Fmarks\u002Fline-and-area.md'\n---\n\n# Prepare Chart Data\n\nUse **trigger → inspect → decide → build → verify**. Keep analytical preparation outside responsive layout and preserve the row lineage needed by tooltips, selection, tables, and drill-down.\n\n## Setup\n\nPrepare semantic rows once, then pass them to marks:\n\n```ts\nimport { groupBy, lineY, rollingWindow } from '@tanstack\u002Fcharts'\n\ninterface Order {\n day: string\n region: string\n amount: number\n}\n\nexport function prepareRevenue(orders: readonly Order[]) {\n const daily = groupBy(orders, {\n by: { region: 'region', day: 'day' },\n outputs: {\n revenue: { value: 'amount', reduce: 'sum' },\n orders: { reduce: 'count' },\n },\n })\n\n return rollingWindow(daily, {\n by: 'region',\n orderBy: 'day',\n size: 7,\n partial: false,\n outputs: { revenue7d: { value: 'revenue', reduce: 'sum' } },\n })\n}\n\nconst prepared = prepareRevenue([\n { day: '2026-08-01', region: 'West', amount: 120 },\n { day: '2026-08-02', region: 'West', amount: 160 },\n])\n\nexport const revenueMark = lineY(prepared, {\n x: 'day',\n y: 'revenue7d',\n z: 'region',\n})\n```\n\n## Core Patterns\n\n### Choose the owner by scope\n\n| Work | Owner |\n| ---------------------------------------- | ------------------------------------------ |\n| Calculation from one row | channel accessor |\n| Reusable cross-row result | eager data transform |\n| Geometry meaningful only inside one mark | `layout: stack()` or `layout: group()` |\n| Product-specific enrichment or filtering | ordinary application function |\n| Pixel-space work after margins resolve | resolved-layout mark, not a data transform |\n\n### Compose structural and analytical transforms\n\n```ts\nimport { normalize, select } from '@tanstack\u002Fcharts'\nimport { fold } from '@tanstack\u002Fcharts\u002Ftransform\u002Ffold'\n\nconst services = [\n { service: 'api', latency: 180, throughput: 820 },\n { service: 'worker', latency: 240, throughput: 510 },\n]\n\nconst folded = fold(services, {\n fields: ['latency', 'throughput'] as const,\n as: { key: 'metric', value: 'measurement' },\n})\n\nconst normalized = normalize(folded, {\n by: 'metric',\n value: 'measurement',\n basis: 'extent',\n as: 'relativeMeasurement',\n})\n\nexport const baselines = select(normalized, {\n by: 'metric',\n select: 'first',\n})\n```\n\nEach stage should have one semantic responsibility and a named output.\n\n### Order path data before mark construction\n\n```ts\nimport { lineY } from '@tanstack\u002Fcharts'\n\nconst rows = [\n { date: new Date('2026-08-03'), value: 14 },\n { date: new Date('2026-08-01'), value: 10 },\n { date: new Date('2026-08-02'), value: 12 },\n]\n\nconst ordered = [...rows].sort((left, right) => +left.date - +right.date)\n\nexport const trend = lineY(ordered, { x: 'date', y: 'value' })\n```\n\nScale domains do not reorder line or area topology.\n\n### Preserve direct lineage\n\nTanStack transforms record their immediate input in `source`. If application code creates additional derived rows, preserve equivalent references when focus, drill-down, or audit must reach the original observations.\n\nRead [the transform decision table](references\u002Ftransforms.md) before combining transform families.\n\n## Common Mistakes\n\n### CRITICAL Sorting after creating the mark\n\nWrong:\n\n```ts\nconst mark = lineY(rows, { x: 'date', y: 'value' })\nrows.sort((left, right) => +left.date - +right.date)\n```\n\nCorrect:\n\n```ts\nconst ordered = [...rows].sort((left, right) => +left.date - +right.date)\nconst mark = lineY(ordered, { x: 'date', y: 'value' })\n```\n\nLine and area marks capture input order as path order.\n\nSource: `docs\u002Freference\u002Fmarks\u002Fline-and-area.md`\n\n### HIGH Running eager transforms in responsive builders\n\nWrong:\n\n```ts\ndefineChart(({ width }) => ({\n marks: [lineY(rollingWindow(rows, options), channels)],\n}))\n```\n\nCorrect:\n\n```ts\nconst prepared = rollingWindow(rows, options)\ndefineChart(({ width }) => ({ marks: [lineY(prepared, channels)] }))\n```\n\nResponsive builders may rerun for size and layout changes while source rows remain unchanged.\n\nSource: `docs\u002Fguides\u002Ftransforms-and-reactivity.md`; `API-FRICTION.md` F-128\n\n### HIGH Manually accumulating ordinary stacks\n\nWrong: maintain application running totals for each x value and series.\n\nCorrect:\n\n```ts\nbarY(rows, {\n x: 'quarter',\n y: 'revenue',\n z: 'product',\n layout: stack(),\n})\n```\n\nNative stack layout owns missing series, negative values, order, and updates. Fixed in the current API, but agents trained on early examples may still generate manual accumulation.\n\nSource: GitHub issue 9; `API-FRICTION.md` F-163\n\n### HIGH Flattening derived rows without lineage\n\nWrong: replace aggregated rows with unlabeled numeric tuples.\n\nCorrect: keep named outputs, grouping fields, and direct source references through each application-owned step.\n\nTooltips, selection, and drill-down otherwise lose the records that contributed to the value.\n\nSource: `docs\u002Freference\u002Ftransforms.md`; `docs\u002Fguides\u002Ftransforms-and-reactivity.md`\n\n### HIGH Tension: analytical honesty versus visual simplicity\n\nAggregation and normalization reduce visual noise but can hide denominators, sample sizes, uncertainty, and missing-value policy. Prepare the evidence required by `design-a-chart` before reducing row detail.\n\nSee also: `design-a-chart\u002FSKILL.md` § Common Mistakes\n\n## References\n\n- [Transform selection and output contracts](references\u002Ftransforms.md)\n\nSee also: `configure-scales-guides-color\u002FSKILL.md`, `build-chart-interactions\u002FSKILL.md`, and `coordinate-charts-with-tanstack\u002FSKILL.md` — derived values determine domains, legends, tooltip content, available lineage, and shared chart-grid projections.\n",{"data":49,"body":58},{"name":4,"description":6,"metadata":50,"sources":54},{"type":51,"library":52,"library_version":53},"core","@tanstack\u002Fcharts","0.9.0",[55,56,57],"TanStack\u002Fcharts:docs\u002Fguides\u002Ftransforms-and-reactivity.md","TanStack\u002Fcharts:docs\u002Freference\u002Ftransforms.md","TanStack\u002Fcharts:docs\u002Freference\u002Fmarks\u002Fline-and-area.md",{"type":59,"children":60},"root",[61,69,83,90,95,1185,1191,1198,1303,1309,2027,2032,2038,2529,2534,2540,2553,2567,2573,2579,2584,2756,2761,2950,2955,2966,2972,2976,3092,3096,3209,3214,3234,3240,3245,3249,3396,3401,3413,3419,3424,3429,3434,3450,3456,3469,3482,3488,3501,3529],{"type":62,"tag":63,"props":64,"children":65},"element","h1",{"id":4},[66],{"type":67,"value":68},"text","Prepare Chart Data",{"type":62,"tag":70,"props":71,"children":72},"p",{},[73,75,81],{"type":67,"value":74},"Use ",{"type":62,"tag":76,"props":77,"children":78},"strong",{},[79],{"type":67,"value":80},"trigger → inspect → decide → build → verify",{"type":67,"value":82},". 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Load for facet counts, numeric ranges, own-filter exclusion, or server-page facet completeness.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[3693,3694,3695],{"name":3573,"slug":32,"type":15},{"name":3545,"slug":3546,"type":15},{"name":9,"slug":8,"type":15},"2026-08-11T04:05:21.505333",{"slug":3698,"name":3698,"fn":3699,"description":3700,"org":3701,"tags":3702,"stars":3638,"repoUrl":3639,"updatedAt":3706},"column-filtering","implement column filtering in TanStack Table","Filter columns with columnFilteringFeature, filteredRowModel, filterFns, filterMeta, nested-row direction, and manualFiltering. 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Load for RTL offsets, z-index, backgrounds, overflow, widths, gaps, or overlaps.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[3723,3726,3727,3728],{"name":3724,"slug":3725,"type":15},"CSS","css",{"name":3545,"slug":3546,"type":15},{"name":9,"slug":8,"type":15},{"name":3562,"slug":3563,"type":15},"2026-08-11T04:05:35.453858",{"slug":3731,"name":3731,"fn":3732,"description":3733,"org":3734,"tags":3735,"stars":3638,"repoUrl":3639,"updatedAt":3739},"column-resizing","implement column resizing in TanStack Table","Wire columnResizingFeature, header.getResizeHandler, resize mode and direction, pointer or touch events, and performant CSS-variable updates. Load when resize state changes but widths do not, or large tables resize slowly.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[3736,3737,3738],{"name":3545,"slug":3546,"type":15},{"name":9,"slug":8,"type":15},{"name":3562,"slug":3563,"type":15},"2026-08-11T04:05:31.46447",{"slug":3741,"name":3741,"fn":3742,"description":3743,"org":3744,"tags":3745,"stars":3638,"repoUrl":3639,"updatedAt":3750},"column-sizing","configure column sizing in TanStack Table","Use columnSizingFeature numeric size, minSize, maxSize, getSize, getStart, getAfter, and total-size APIs in table, grid, or flex CSS. Load for auto or percentage misconceptions and sizing\u002Fpinning layout mismatch.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[3746,3747,3748,3749],{"name":3724,"slug":3725,"type":15},{"name":3545,"slug":3546,"type":15},{"name":9,"slug":8,"type":15},{"name":3562,"slug":3563,"type":15},"2026-08-11T04:05:28.559861",{"slug":3752,"name":3752,"fn":3753,"description":3754,"org":3755,"tags":3756,"stars":3638,"repoUrl":3639,"updatedAt":3760},"column-visibility","manage column visibility in TanStack Table","Hide columns with columnVisibilityFeature while rendering visibility-aware header, column, and cell collections. Load when hidden columns remain in the DOM, false-versus-absent state is confused, or enableHiding is misunderstood.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[3757,3758,3759],{"name":3545,"slug":3546,"type":15},{"name":9,"slug":8,"type":15},{"name":3562,"slug":3563,"type":15},"2026-08-11T04:05:27.479925",139]