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const crypto = require('crypto');
/**
* Set context path
*
* @type {string}
* @private
*/
const contextPath = process.cwd();
/**
* Simple consistent hash from content.
*
* @param {Array|object|*} content
* @returns {string}
*/
const generateHash = content =>
crypto
.createHash('sha1')
.update(JSON.stringify({ value: (typeof content === 'function' && content.toString()) || content }))
.digest('hex');
/**
* Check if "is a Promise", "Promise like".
*
* @param {Promise|*} obj
* @returns {boolean}
*/
const isPromise = obj => /^\[object (Promise|Async|AsyncFunction)]/.test(Object.prototype.toString.call(obj));
/**
* Simple argument based memoize with adjustable limit, and extendable cache expire.
* Expiration expands until a pause in use happens. Also allows for promises
* and promise-like functions. For promises and promise-like functions it's the
* consumers responsibility to await or process the resolve/reject.
*
* @param {Function} func A function or promise/promise-like function to memoize
* @param {object} options
* @param {number} options.cacheLimit Number of entries to cache before overwriting previous entries
* @param {number} options.expire Expandable milliseconds until cache expires. The more you use it the longer it takes to expire.
* @returns {Function}
*/
const memo = (func, { cacheLimit = 1, expire } = {}) => {
const isFuncPromise = isPromise(func);
const updatedExpire = Number.parseInt(expire, 10) || undefined;
// eslint-disable-next-line func-names
const ized = function () {
const cache = [];
let timeout;
return (...args) => {
const isMemo = cacheLimit > 0 && args.length;
let key;
let keyIndex = -1;
Iif (typeof updatedExpire === 'number') {
clearTimeout(timeout);
timeout = setTimeout(() => {
cache.length = 0;
}, updatedExpire);
}
if (isMemo) {
key = generateHash(args);
keyIndex = cache.indexOf(key);
} else E{
cache.length = 0;
}
if (keyIndex < 0) {
cache.unshift(
key,
(isFuncPromise &&
Promise.all([func.call(null, ...args)]).then(result => {
cache[cache.indexOf(key) + 1] = result?.[0];
return result?.[0];
})) ||
func.call(null, ...args)
);
Eif (isMemo) {
cache.length = cacheLimit * 2;
}
return cache[1];
}
Iif (isFuncPromise) {
return Promise.resolve(cache[keyIndex + 1]);
}
return cache[keyIndex + 1];
};
};
return ized();
};
/**
* Set a base config for apidocs, apply apidoc-mock custom comment parser.
*
* @type {{silent: boolean, dryRun: boolean, src: undefined, parsers: {apimock: string}, dest: undefined}}
*/
const apiDocBaseConfig = {
src: undefined,
dest: undefined,
dryRun: process.env.NODE_ENV === 'test',
silent: process.env.NODE_ENV === 'test',
parsers: {
apimock: join(__dirname, './apidocConfig.js')
}
};
/**
* Global options/settings. One time _set, then freeze.
*
* @type {{contextPath: string, _set: *}}
*/
const OPTIONS = {
contextPath,
apiDocBaseConfig,
set _set(obj) {
Object.entries(obj).forEach(([key, value]) => {
if (typeof value === 'function') {
this[key] = value.call(this);
return;
}
this[key] = value;
});
delete this._set;
Object.freeze(this);
}
};
module.exports = { contextPath, generateHash, memo, OPTIONS };
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