# vega-functions > Custom functions for the Vega expression language. Latest version **6.2.0** (published 2026-08-14) · BSD-3-Clause license · 0 weekly downloads ## Install ```sh npm install vega-functions pnpm add vega-functions yarn add vega-functions bun add vega-functions ``` ## Health **Score 65/100 (B)** — status: active. Positive: esm support; no vulnerabilities; recently updated; high maintenance score; popular repo. Warnings: low downloads; no types. ## Facts | | | |---|---| | Version | 6.2.0 | | Published | 2026-08-14 | | First published | 2019-02-18 | | Weekly downloads | 0 | | License | BSD-3-Clause | | TypeScript types | none | | Module format | ESM | | Dependencies | 12 | | Unpacked size | 133.8 KB | | Known vulnerabilities | 0 | | Install scripts | no | | GitHub stars | 12009 | | Author | Vega | | Maintainers | domoritz, hydrosquall, jheer, arvindsatya1, lhermann | | Keywords | vega, expression, functions | ## Links - npm: https://www.npmjs.com/package/vega-functions - Repository: https://github.com/vega/vega - Homepage: https://github.com/vega/vega/tree/main/packages/vega-functions#readme - Issues: https://github.com/vega/vega/issues - npm.io page: https://npm.io/package/vega-functions ## Dependencies (12) - [d3-geo](https://npm.io/package/d3-geo.md) ^3.1.1 - [d3-ease](https://npm.io/package/d3-ease.md) ^3.0.1 - [d3-array](https://npm.io/package/d3-array.md) ^3.2.4 - [d3-color](https://npm.io/package/d3-color.md) ^3.1.0 - [vega-time](https://npm.io/package/vega-time.md) ^3.3.0 - [vega-util](https://npm.io/package/vega-util.md) ^2.1.3 - [vega-scale](https://npm.io/package/vega-scale.md) ^8.1.3 - [vega-dataflow](https://npm.io/package/vega-dataflow.md) ^6.1.3 - [vega-expression](https://npm.io/package/vega-expression.md) ^6.2.2 - [vega-scenegraph](https://npm.io/package/vega-scenegraph.md) ^5.3.0 - [vega-selections](https://npm.io/package/vega-selections.md) ^6.1.5 - [vega-statistics](https://npm.io/package/vega-statistics.md) ^2.0.0 ## Recent versions - 6.2.0 (latest) — 2026-08-14 - 6.1.3 — 2026-07-22 - 6.1.2 — 2026-07-21 - 6.1.1 — 2025-12-05 - 5.18.1 — 2025-10-23 - 6.1.0 — 2025-09-16 - 6.0.0 — 2025-03-27 - 5.18.0 — 2025-03-16 - 5.17.0 — 2025-02-25 - 5.16.0 — 2025-01-24 - 5.15.0 — 2024-06-14 - 5.14.0 — 2023-11-07 - 5.13.2 — 2023-04-26 - 5.13.1 — 2023-03-01 - 5.13.0 — 2022-03-11 - … 23 more at https://npm.io/package/vega-functions/versions ## README # vega-functions Function implementations for the [Vega expression language](https://vega.github.io/vega/docs/expressions/). Unlike the basic utility functions included in the [vega-expression](https://github.com/vega/vega/tree/master/packages/vega-expression) package, this package includes custom expression functions, many of which are specific to Vega dataflows. ## Provided Functions This package provides the following expression functions. All other constants and functions are provided by the base [vega-expression](https://github.com/vega/vega/tree/master/packages/vega-expression) package. **Type Checking Functions** - [isArray](https://vega.github.io/vega/docs/expressions/#isArray) - [isBoolean](https://vega.github.io/vega/docs/expressions/#isBoolean) - [isDate](https://vega.github.io/vega/docs/expressions/#isDate) - [isNumber](https://vega.github.io/vega/docs/expressions/#isNumber) - [isObject](https://vega.github.io/vega/docs/expressions/#isObject) - [isRegExp](https://vega.github.io/vega/docs/expressions/#isRegExp) - [isString](https://vega.github.io/vega/docs/expressions/#isString) - [isTuple](https://vega.github.io/vega/docs/expressions/#isTuple) **Type Coercion Functions** - [toBoolean](https://vega.github.io/vega/docs/expressions/#toBoolean) - [toDate](https://vega.github.io/vega/docs/expressions/#toDate) - [toNumber](https://vega.github.io/vega/docs/expressions/#toNumber) - [toString](https://vega.github.io/vega/docs/expressions/#toString) **Math Functions** - [random](https://vega.github.io/vega/docs/expressions/#random) **Easing Functions** Each family below is also provided in `In`, `Out` and `InOut` variants (for example, `easeQuadIn`), except for `easeLinear`. - [easeLinear](https://vega.github.io/vega/docs/expressions/#easeLinear) - [easeQuad](https://vega.github.io/vega/docs/expressions/#easeQuad) - [easeCubic](https://vega.github.io/vega/docs/expressions/#easeCubic) - [easePoly](https://vega.github.io/vega/docs/expressions/#easePoly) - [easeSin](https://vega.github.io/vega/docs/expressions/#easeSin) - [easeExp](https://vega.github.io/vega/docs/expressions/#easeExp) - [easeCircle](https://vega.github.io/vega/docs/expressions/#easeCircle) - [easeBounce](https://vega.github.io/vega/docs/expressions/#easeBounce) - [easeBack](https://vega.github.io/vega/docs/expressions/#easeBack) - [easeElastic](https://vega.github.io/vega/docs/expressions/#easeElastic) **Date/Time Functions** - [quarter](https://vega.github.io/vega/docs/expressions/#quarter) - [utcquarter](https://vega.github.io/vega/docs/expressions/#utcquarter) **Array Functions** - [clampRange](https://vega.github.io/vega/docs/expressions/#clampRange) - [extent](https://vega.github.io/vega/docs/expressions/#extent) - [inrange](https://vega.github.io/vega/docs/expressions/#inrange) - [interpolateLinear](https://vega.github.io/vega/docs/expressions/#interpolateLinear) - [lerp](https://vega.github.io/vega/docs/expressions/#lerp) - [peek](https://vega.github.io/vega/docs/expressions/#peek) - [sequence](https://vega.github.io/vega/docs/expressions/#sequence) - [span](https://vega.github.io/vega/docs/expressions/#span) **String Functions** - [pad](https://vega.github.io/vega/docs/expressions/#pad) - [truncate](https://vega.github.io/vega/docs/expressions/#truncate) **Object Functions** - [merge](https://vega.github.io/vega/docs/expressions/#merge) **Formatting Functions** - [format](https://vega.github.io/vega/docs/expressions/#format) - [utcFormat](https://vega.github.io/vega/docs/expressions/#utcFormat) - [utcParse](https://vega.github.io/vega/docs/expressions/#utcParse) - [timeFormat](https://vega.github.io/vega/docs/expressions/#timeFormat) - [timeParse](https://vega.github.io/vega/docs/expressions/#timeParse) - [monthFormat](https://vega.github.io/vega/docs/expressions/#monthFormat) - [monthAbbrevFormat](https://vega.github.io/vega/docs/expressions/#monthAbbrevFormat) - [dayFormat](https://vega.github.io/vega/docs/expressions/#dayFormat) - [dayAbbrevFormat](https://vega.github.io/vega/docs/expressions/#dayAbbrevFormat) **Color Functions** - [rgb](https://vega.github.io/vega/docs/expressions/#rgb) - [lab](https://vega.github.io/vega/docs/expressions/#lab) - [hcl](https://vega.github.io/vega/docs/expressions/#hcl) - [hsl](https://vega.github.io/vega/docs/expressions/#hsl) **Event Functions** - [pinchDistance](https://vega.github.io/vega/docs/expressions/#pinchDistance) - [pinchAngle](https://vega.github.io/vega/docs/expressions/#pinchAngle) - [inScope](https://vega.github.io/vega/docs/expressions/#inScope) **Scale and Projection Functions** - [bandspace](https://vega.github.io/vega/docs/expressions/#bandspace) - [bandwidth](https://vega.github.io/vega/docs/expressions/#bandwidth) - [copy](https://vega.github.io/vega/docs/expressions/#copy) - [domain](https://vega.github.io/vega/docs/expressions/#domain) - [gradient](https://vega.github.io/vega/docs/expressions/#gradient) - [invert](https://vega.github.io/vega/docs/expressions/#invert) - [range](https://vega.github.io/vega/docs/expressions/#range) - [scale](https://vega.github.io/vega/docs/expressions/#scale) - [panLinear](https://vega.github.io/vega/docs/expressions/#panLinear) - [panLog](https://vega.github.io/vega/docs/expressions/#panLog) - [panPow](https://vega.github.io/vega/docs/expressions/#panPow) - [panSymlog](https://vega.github.io/vega/docs/expressions/#panSymlog) - [zoomLinear](https://vega.github.io/vega/docs/expressions/#zoomLinear) - [zoomLog](https://vega.github.io/vega/docs/expressions/#zoomLog) - [zoomPow](https://vega.github.io/vega/docs/expressions/#zoomPow) - [zoomSymlog](https://vega.github.io/vega/docs/expressions/#zoomSymlog) - flush (used internally for axis and legend label layout) **Geographic Functions** - [geoArea](https://vega.github.io/vega/docs/expressions/#geoArea) - [geoBounds](https://vega.github.io/vega/docs/expressions/#geoBounds) - [geoCentroid](https://vega.github.io/vega/docs/expressions/#geoCentroid) - [geoScale](https://vega.github.io/vega/docs/expressions/#geoScale) - [geoTranslate](https://vega.github.io/vega/docs/expressions/#geoTranslate) **Shape Functions** - geoShape (used internally for mark clipping) - pathShape (used internally for mark clipping) **Data Functions** - [indata](https://vega.github.io/vega/docs/expressions/#indata) - [data](https://vega.github.io/vega/docs/expressions/#data) - setdata (used internally for scale domain data) - modify (used internally for trigger updates) **Dataflow Functions** - encode (used internally for signal updates) **Tree (Hierarchy) Functions** - [treePath](https://vega.github.io/vega/docs/expressions/#treePath) - [treeAncestors](https://vega.github.io/vega/docs/expressions/#treeAncestors) **Browser Functions** - [screen](https://vega.github.io/vega/docs/expressions/#screen) - [containerSize](https://vega.github.io/vega/docs/expressions/#containerSize) - [windowSize](https://vega.github.io/vega/docs/expressions/#windowSize) **Logging Functions** - [warn](https://vega.github.io/vega/docs/expressions/#warn) - [info](https://vega.github.io/vega/docs/expressions/#info) - [debug](https://vega.github.io/vega/docs/expressions/#debug) --- _Source: https://npm.io/package/vega-functions · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._