kitten.sh
1const webCrypto = (
2 typeof window !== 'undefined'
3 ? window.crypto
4 : typeof self !== 'undefined'
5 ? self.crypto
6 : null
7) as typeof globalThis.crypto | null;
8
9let nodeCrypto: Promise<typeof import('crypto') | void> | void;
10
11const getNodeCrypto = async (): Promise<typeof import('crypto') | void> => {
12 if (!nodeCrypto) {
13 // Indirect eval'd require/import to guarantee no side-effects in module scope
14 // (optimization for minifiers)
15 try {
16 nodeCrypto = new Function('require', 'return require("crypto")')(require);
17 } catch (_error) {
18 try {
19 nodeCrypto = new Function('return import("crypto")')();
20 } catch (_error) {}
21 }
22 }
23 return nodeCrypto;
24};
25
26export const hash = async (query: string): Promise<string> => {
27 if (webCrypto && webCrypto.subtle) {
28 const digest = await webCrypto.subtle.digest(
29 { name: 'SHA-256' },
30 new TextEncoder().encode(query)
31 );
32 return new Uint8Array(digest).reduce(
33 (prev, byte) => prev + byte.toString(16).padStart(2, '0'),
34 ''
35 );
36 } else if (await getNodeCrypto()) {
37 // Node.js support
38 return (await nodeCrypto)!.createHash('sha256').update(query).digest('hex');
39 }
40
41 if (process.env.NODE_ENV !== 'production') {
42 console.warn(
43 '[@urql/exchange-persisted-fetch]: The Node Crypto and Web Crypto APIs are not available.\n' +
44 'This is an unexpected error. Please report it by filing a GitHub Issue.'
45 );
46 }
47
48 return '';
49};