framer-motion/src/utils/resolve-value.ts

An open source and production-ready motion library for React on the web

import { CustomValueType, ValueTarget, SingleTarget } from "../types"
import { isKeyframesTarget } from "../animation/utils/is-keyframes-target"

export const isCustomValue = (v: any): v is CustomValueType => {
    return Boolean(v && typeof v === "object" && v.mix && v.toValue)
}

export const resolveFinalValueInKeyframes = (v: ValueTarget): SingleTarget => {
    // TODO maybe throw if v.length - 1 is placeholder token?
    return isKeyframesTarget(v) ? v[v.length - 1] || 0 : v
}