@graphql-tools/load
Version:
A set of utils for faster development of GraphQL tools
42 lines (41 loc) • 1.11 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.stringToHash = stringToHash;
exports.useStack = useStack;
exports.useLimit = useLimit;
const tslib_1 = require("tslib");
const p_limit_1 = tslib_1.__importDefault(require("p-limit"));
/**
* Converts a string to 32bit integer
*/
function stringToHash(str) {
let hash = 0;
if (str.length === 0) {
return hash;
}
let char;
for (let i = 0; i < str.length; i++) {
char = str.charCodeAt(i);
// tslint:disable-next-line: no-bitwise
hash = (hash << 5) - hash + char;
// tslint:disable-next-line: no-bitwise
hash = hash & hash;
}
return hash;
}
function useStack(...fns) {
return (input) => {
function createNext(i) {
if (i >= fns.length) {
return () => { };
}
return function next() {
fns[i](input, createNext(i + 1));
};
}
fns[0](input, createNext(1));
};
}
function useLimit(concurrency) {
return (0, p_limit_1.default)(concurrency);
}