• Fix circumcenters when the hull is collinear. d3/d3-delaunay#142

• Fix precision error calculating voronoi.neighbors. d3/d3-delaunay#138 d3/d3-delaunay#139
• Fix broken polygon. d3/d3-delaunay#140
• Fix threshold generation when input is empty or has no deviation. d3/d3-array#271

• d3.ticks now tries harder to generate at least one tick. d3/d3-array#264

• Tolerate invalid input values when generating contours. #61
• Tolerate invalid input weights when generating density contours. #65
• Fix missing contours at extrema when using default thresholds. #68

• Add d3.pathRound.
• Add configurable precision when generating path data via path.digits.
• Add likewise shape.digits method to d3.arc, d3.area, d3.line, d3.link, and d3.symbol.
• Improve the performance of d3.geoPath’s string concatenation.
• Fix arc rendering for small arcs with rounded corners.
• Fix BumpRadial implementation to support multiple points.
• Fix projection when lambda is outside the range ±3π.
• Rename d3.symbolX to d3.symbolTimes; d3.symbolX is now deprecated.

• Add d3.unixDay and d3.unixDays. d3/d3-time#58
• Adopt d3.unixDay in place of d3.utcDay for d3.utcTicks to ensure uniform tick spacing.
• Fix mutation of user-owned thresholds in d3.bin. d3/d3-array#263
• Fix infinite loop when d3.quantile or d3.quickselect is called with invalid arguments. d3/d3-array#262

• density.bandwidth now supports fractional (non-integer) values.

• Add d3.blur.
• Add d3.blur2.
• Add d3.blurImage.
• Add d3.medianIndex.
• Add d3.quantileIndex.

• Add density.contours.

• Fix the interpretation of an array of numbers passed to density.thresholds.

• Fix incorrect behavior of d3.bisector when given an asymmetric comparator.

• Fix crash in d3.bin. Thanks, @weiglemc!

• Fix off-by-one bin assignment due to rounding error in d3.bin.

• Significantly improve the performance of d3.bin.
• Fix the implementation of d3.thresholdScott.
• d3.pack and d3.packEnclose are now fully deterministic.
• d3.pack and d3.packEnclose now handle certain floating point errors better.

• Add rgb.clamp and hsl.clamp.
• Add color.formatHex8.
• Fix color.formatHsl to clamp values to the expected range.
• Fix catastrophic backtracking when parsing colors. SNYK-JS-D3COLOR-1076592

• Add d3.symbolsStroke. Thanks, @hemanrobinson!
• Add d3.symbolsFill, replacing (deprecating) d3.symbols.
• Add d3.symbolAsterisk.
• Add d3.symbolDiamond2.
• Add d3.symbolPlus.
• Add d3.symbolSquare2.
• Add d3.symbolTriangle2.
• Add d3.symbolX.
• Add d3.link.

• Fix stratify.path when the top-level directory is only a single character.
• Fix stratify.path when paths contain multiple trailing slashes.

• Add stratify.path.

• d3.rank can now take a comparator in addition to an accessor.
• d3.rank, d3.sort, d3.bisector, and d3.groupSort now require comparators to have exactly two arguments.

• Add d3.rank.

• Default the base-10 log tick format to ~s (SI) instead of .0e (exponential).

• Don’t mangle InternMap or InternSet in the generated UMD bundle.

• Adopt interning for set operations. #231
• Fix InternSet and InternMap’s delete operation. mbostock/internmap@2.0.2
• Fix log.ticks to return exact values for integer bases. #253
• Fix log.tickFormat to trim trailing zeroes by default if no precision is specified. #254

• Fix d3.sort, d3.bisector, and related methods to handle undefined order. #217

Breaking changes:

• Adopt type: module. #3501
• Adopt InternMap for ordinal scale domains.
• d3.ascending and d3.descending no longer consider null comparable.
• d3.bin now ignores nulls.
• Convert array-likes (e.g., live NodeList) to arrays in d3.selectAll and selection.selectAll.

Non-breaking changes:

• Add d3.mode.
• Add d3.flatGroup and d3.flatRollup.
• Add transition.selectChild.
• Add transition.selectChildren.
• Adopt robust predicates for Delaunay triangulation.
• Fix delaunay.voronoi’s computed circumcenters for collinear points on the hull.
• Allow brush.move and brush.clear to take an optional event.
• Allow selection.merge to take a transition.
• Allow selection.join to take transitions.
• Apply linear binning for d3.contourDensity.
• Generate contours.thresholds at nicer round tick values.
• Fix axis.tickArguments to accept an iterable.
• Fix axis.tickValues to accept an iterable.
• Fix undefined event during brush.move.
• Fix drag event listeners to be explicitly non-passive where necessary (#78).
• Fix zoom event listeners to be explicitly non-passive where necessary.
• Fix variable initialization error in d3-zoom.
• Expose d3.ZoomTransform constructor.
• Update dependencies.
• Make build reproducible.

D3 now requires Node.js 12 or higher. For more, please read Sindre Sorhus’s FAQ.

• Add d3.timeTicks and d3.utcTicks.
• Add d3.timeTickInterval and d3.utcTickInterval.

• Fix handling of null with quantitative scales; null is now considered an “unknown” value, not zero.

• Fix rounding error in d3.ticks.

• Add d3.fcumsum. Thanks, @Fil!
• Add d3.curveBumpX and d3.curveBumpY. Thanks, @Fil!
• Add axis.offset.
• Only offset the axis by 0.5px on low-resolution devices (devicePixelRatio ≤ 1).
• Update dependencies.

• Add d3.groupSort.
• Allow d3.sort to take multiple accessors.

• Add d3.InternMap.
• Add d3.InternSet.
• Change d3.group, d3.rollup et al. to use InternMap.

• Fix last bin with d3.bin when the values are not numbers.
• Fix last bin with d3.bin when the tick increment is fractional.

• d3.sort now may accept an accessor.
• Fix zero-width last bin with d3.bin.

• Add d3.nice.
• Add d3.every.
• Add d3.some.
• Add d3.filter.
• Add d3.map.
• Add d3.reduce.
• Add d3.reverse.
• Add d3.sort.
• Add d3.difference.
• Add d3.disjoint.
• Add d3.intersection.
• Add d3.superset.
• Add d3.subset.
• Add d3.union.
• Fix d3.bin to nice the domain by default, ensuring uniform bin widths.
• Fix d3.scaleQuantile performance regression. Thanks @ilijapuaca!

• Fix imprecision with bin.thresholds(count).

• Add d3.shuffler.
• Add d3.bisectCenter.
• Fix off-by-one with bisector.center.
• Accept any integer seed with d3.randomLcg.

• Adopt ES2015, including support for iterables and collections (Map and Set).
• Remove d3.event; selection.on now passes events directly to listeners.
• Remove d3.mouse, d3.touch, d3.touches, d3.clientPoint; add d3.pointer and d3.pointers.
• Remove d3.nest; add d3.group and d3.rollup.
• Remove d3-collection; see d3-array.
• Remove d3-voronoi; add d3-delaunay.
• Remove support for Bower.

For more on what’s new, see CHANGES.

To upgrade from D3 5.x, see the migration guide.

• Add projection.reflectX.
• Add projection.reflectY.
• Fix achromatic hexadecimal colors.

• Fix sign of near-zero negative values when using the + sign directive.

• Add d3.interpolateNumberArray.
• Add support for typed arrays to d3.interpolate.
• Add support for typed arrays to d3.interpolateArray.
• Fix numeric interpolation to return exact values for t = 0 and t = 1.
• Fix trimming of trailing zeroes in exponents.

• Expose brush.touchable.

• Propagate the this context to interpolators in transition.styleTween, transition.attrTween and transition.textTween.

• Add transition.textTween.
• Fix handling of zero values in d3.stackOffsetDiverging.

• Fix crash initializing d3.brush.

• Add d3.csvFormatRow.
• Add d3.csvFormatValue.
• Add d3.tsvFormatRow.
• Add d3.tsvFormatValue.
• Add dsv.formatRow.
• Add dsv.formatValue.
• Add support for parsing 4- and 8-digit hexadecimal colors in d3.color. Thanks, @zerovox!
• Allow shorthand for current time intervals (e.g., d3.timeDay() returns today’s midnight).
• Disallow whitespace and periods in type names passed to d3.dispatch.
• Add fa-IR d3-time-format locale. Thanks, @mohsentaleb!
• Add %q directive for quarter of the year as a decimal number. Thanks, @jheer!
• Fix off-by-one error formatting %U when the year starts with Sunday.
• Fix off-by-one error formatting %W when the year starts with Monday.
• Fix off-by-one error parsing week and weekday numbers with d3.utcParse.
• Fix string coercion of specifier passed to d3.utcParse.
• Fix parsing of %L or %f in conjunction with %s.

• Add d3.FormatSpecifier.
• Allow minus sign to be localized in d3.format. Thanks, @benib!
• Allow NaN to be localized in d3.format.

• Add d3.interpolateTurbo.
• Add d3.interpolateCividis.

• Fix broken brush corner resizers.
• Fix brush multitouch filtering.

d3-brush

• Add brush.touchable.
• Add brush.clear.
• Add brush.keyModifiers.
• Fix default brush.extent to consider the SVG viewBox, if any.
• Fix scroll prevention on touch devices.
• Fix coercion of selection and extent inputs.
• Fix order of handles in the DOM.
• Fix brush.move when selection is empty.
• Fix Space key immediately after clicking on a handle.
• Fix missing brush event on parallel start.
• Fix handling of orphaned input gestures.
• Fix default brush.touchable if navigator.maxTouchPoints.
• Fix multitouch gestures.
• Fix click consumption when brush is not empty.
• Fix default brush.filter on control-click.

d3-color

• Add color.copy.
• Add color.formatHex.
• Add color.formatHsl.
• Add color.formatRgb.
• Deprecate color.hex; use color.formatHex instead.

d3-drag

• Fix default drag.filter on control-click.
• Fix default drag.touchable if navigator.maxTouchPoints.

d3-path

• Fix coercion of anticlockwise argument to path.arc. Thanks, @Fil!

d3-scale-chromatic

• Add d3.schemeTableau10. Thanks @akngs!

d3-zoom

• Fix default zoom.extent to consider the SVG viewBox.
• Fix default zoom.filter to ignore control-click.
• Fix default zoom.touchable if navigator.maxTouchPoints.
• Fix default zoom.wheelDelta if deltaMode !== 0. Thanks, @Dakkaron!
• Fix handling of filtered multitouch gestures. Thanks, @robinhouston and @testower!
• Fix handling of orphaned gestures.
• Fix emitting of zoom events during dbltap gestures. Thanks, @cambecc!
• Add optional point to zoom.transform and related methods.
• Fix d3.zoomTransform to inherit the transform from the closest ancestor, if any.

• Revert chroma clamping in hcl.toString.

• Account for rounding when determining whether a color is displayable.

• Implement chroma clamping in hcl.toString.
• Fix achromatic representation of white in d3.hcl (again).

• Fix achromatic representation of black and white in d3.hcl.

• Fix d3.stackDivergingOffset when there is only one series.
• Fix achromatic representation of black and white in d3.hcl.
• Fix d3.geoContains for LineStrings. Thanks, @ondras!
• Fix d3.geoContains for longitudes outside of ±180°.
• Fix d3.geoBounds for sphers.