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- // Unique ID creation requires a high quality random # generator. In the browser we therefore
- // require the crypto API and do not support built-in fallback to lower quality random number
- // generators (like Math.random()).
- var getRandomValues;
- var rnds8 = new Uint8Array(16);
- export default function rng() {
- // lazy load so that environments that need to polyfill have a chance to do so
- if (!getRandomValues) {
- // getRandomValues needs to be invoked in a context where "this" is a Crypto implementation. Also,
- // find the complete implementation of crypto (msCrypto) on IE11.
- getRandomValues = typeof crypto !== 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto) || typeof msCrypto !== 'undefined' && typeof msCrypto.getRandomValues === 'function' && msCrypto.getRandomValues.bind(msCrypto);
- if (!getRandomValues) {
- throw new Error('crypto.getRandomValues() not supported. See https://github.com/uuidjs/uuid#getrandomvalues-not-supported');
- }
- }
- return getRandomValues(rnds8);
- }
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