framer-motion
Version:
A simple and powerful JavaScript animation library
14 lines (12 loc) • 703 B
JavaScript
const checkStringStartsWith = (token) => (key) => typeof key === "string" && key.startsWith(token);
const isCSSVariableName = checkStringStartsWith("--");
const startsAsVariableToken = checkStringStartsWith("var(--");
const isCSSVariableToken = (value) => {
const startsWithToken = startsAsVariableToken(value);
if (!startsWithToken)
return false;
// Ensure any comments are stripped from the value as this can harm performance of the regex.
return singleCssVariableRegex.test(value.split("/*")[0].trim());
};
const singleCssVariableRegex = /var\(--(?:[\w-]+\s*|[\w-]+\s*,(?:\s*[^)(\s]|\s*\((?:[^)(]|\([^)(]*\))*\))+\s*)\)$/iu;
export { isCSSVariableName, isCSSVariableToken };