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rng-browser.js 1.0KB

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  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", {
  3. value: true
  4. });
  5. exports.default = rng;
  6. // Unique ID creation requires a high quality random # generator. In the browser we therefore
  7. // require the crypto API and do not support built-in fallback to lower quality random number
  8. // generators (like Math.random()).
  9. // getRandomValues needs to be invoked in a context where "this" is a Crypto implementation. Also,
  10. // find the complete implementation of crypto (msCrypto) on IE11.
  11. var getRandomValues = typeof crypto != 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto) || typeof msCrypto != 'undefined' && typeof msCrypto.getRandomValues == 'function' && msCrypto.getRandomValues.bind(msCrypto);
  12. var rnds8 = new Uint8Array(16); // eslint-disable-line no-undef
  13. function rng() {
  14. if (!getRandomValues) {
  15. throw new Error('crypto.getRandomValues() not supported. See https://github.com/uuidjs/uuid#getrandomvalues-not-supported');
  16. }
  17. return getRandomValues(rnds8);
  18. }
  19. module.exports = exports.default;