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const escRegex = /[^a-zA-Z0-9_\u0081-\uffff-]/g
function esc(string: string) {
return `${string}`.replace(escRegex, (s) => `\\${s}`)
}
const dashCaseRegex = /[A-Z]/g
function dashCase(string: string) {
return string.replace(dashCaseRegex, (match) => `-${match.toLowerCase()}`)
}
export interface CssVar {
var: string
ref: string
}
export interface CssVarOptions {
fallback?: string | undefined
prefix?: string | undefined
}
export function cssVar(name: string, options: CssVarOptions = {}): CssVar {
const { fallback = "", prefix = "" } = options
const variable = dashCase(["-", prefix, esc(name)].filter(Boolean).join("-"))
return {
var: variable,
ref: `var(${variable}${fallback ? `, ${fallback}` : ""})`,
}
}
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