frontend/node_modules/@emotion/react/src/keyframes.ts

import { CSSInterpolation } from '@emotion/serialize'
import css from './css'

type Keyframes = {
  name: string
  styles: string
  anim: 1
  toString: () => string
} & string

export function keyframes(
  template: TemplateStringsArray,
  ...args: CSSInterpolation[]
): Keyframes
export function keyframes(...args: CSSInterpolation[]): Keyframes
export function keyframes(...args: CSSInterpolation[]) {
  let insertable = css(...args)
  const name = `animation-${insertable.name}`
  return {
    name,
    styles: `@keyframes ${name}{${insertable.styles}}`,
    anim: 1,
    toString() {
      return `_EMO_${this.name}_${this.styles}_EMO_`
    }
  }
}