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util.js
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util.js
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var fs = require("fs");
var path = require("path");
var createHash = require("crypto").createHash;
var assert = require("assert");
exports.mkdirp = function mkdirp(dir) {
if (! fs.existsSync(dir)) {
var parentDir = path.dirname(dir);
if (parentDir !== dir) {
mkdirp(parentDir);
}
try {
fs.mkdirSync(dir);
} catch (error) {
if (error.code !== "EEXIST") {
throw error;
}
}
}
return dir;
};
exports.deepClone = function (val) {
return deepCloneHelper(val, new Map);
};
function deepCloneHelper(val, seen) {
if (seen.has(val)) {
return seen.get(val);
}
if (Array.isArray(val)) {
const copy = new Array(val.length);
seen.set(val, copy);
val.forEach(function (child, i) {
copy[i] = deepCloneHelper(child, seen);
});
return copy;
}
if (val !== null && typeof val === "object") {
const copy = Object.create(Object.getPrototypeOf(val));
seen.set(val, copy);
const handleKey = function (key) {
const desc = Object.getOwnPropertyDescriptor(val, key);
desc.value = deepCloneHelper(val[key], seen);
Object.defineProperty(copy, key, desc);
};
Object.getOwnPropertyNames(val).forEach(handleKey);
Object.getOwnPropertySymbols(val).forEach(handleKey);
return copy;
}
return val;
}
function deepHash(val) {
return createHash("sha1").update(
JSON.stringify(val, function (key, value) {
switch (typeof value) {
case "function": return String(value);
default: return value;
}
})
).digest("hex");
}
exports.deepHash = function (val) {
var argc = arguments.length;
if (argc === 1) {
return deepHash(val);
}
var args = new Array(argc);
for (var i = 0; i < argc; ++i) {
args[i] = arguments[i];
}
return deepHash(args);
};