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rOACCT/node_modules/babel-loader/lib/cache.js
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"use strict";
function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }
function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }
/**
* Filesystem Cache
*
* Given a file and a transform function, cache the result into files
* or retrieve the previously cached files if the given file is already known.
*
* @see https://github.com/babel/babel-loader/issues/34
* @see https://github.com/babel/babel-loader/pull/41
*/
const fs = require("fs");
const os = require("os");
const path = require("path");
const zlib = require("zlib");
const crypto = require("crypto");
const findCacheDir = require("find-cache-dir");
const {
promisify
} = require("util");
const transform = require("./transform"); // Lazily instantiated when needed
let defaultCacheDirectory = null;
const readFile = promisify(fs.readFile);
const writeFile = promisify(fs.writeFile);
const gunzip = promisify(zlib.gunzip);
const gzip = promisify(zlib.gzip);
const makeDir = require("make-dir");
/**
* Read the contents from the compressed file.
*
* @async
* @params {String} filename
* @params {Boolean} compress
*/
const read = /*#__PURE__*/function () {
var _ref = _asyncToGenerator(function* (filename, compress) {
const data = yield readFile(filename + (compress ? ".gz" : ""));
const content = compress ? yield gunzip(data) : data;
return JSON.parse(content.toString());
});
return function read(_x, _x2) {
return _ref.apply(this, arguments);
};
}();
/**
* Write contents into a compressed file.
*
* @async
* @params {String} filename
* @params {Boolean} compress
* @params {String} result
*/
const write = /*#__PURE__*/function () {
var _ref2 = _asyncToGenerator(function* (filename, compress, result) {
const content = JSON.stringify(result);
const data = compress ? yield gzip(content) : content;
return yield writeFile(filename + (compress ? ".gz" : ""), data);
});
return function write(_x3, _x4, _x5) {
return _ref2.apply(this, arguments);
};
}();
/**
* Build the filename for the cached file
*
* @params {String} source File source code
* @params {Object} options Options used
*
* @return {String}
*/
const filename = function (source, identifier, options) {
const hash = crypto.createHash("md4");
const contents = JSON.stringify({
source,
options,
identifier
});
hash.update(contents);
return hash.digest("hex") + ".json";
};
/**
* Handle the cache
*
* @params {String} directory
* @params {Object} params
*/
const handleCache = /*#__PURE__*/function () {
var _ref3 = _asyncToGenerator(function* (directory, params) {
const {
source,
options = {},
cacheIdentifier,
cacheDirectory,
cacheCompression
} = params;
const file = path.join(directory, filename(source, cacheIdentifier, options));
try {
// No errors mean that the file was previously cached
// we just need to return it
return yield read(file, cacheCompression);
} catch (err) {}
const fallback = typeof cacheDirectory !== "string" && directory !== os.tmpdir(); // Make sure the directory exists.
try {
yield makeDir(directory);
} catch (err) {
if (fallback) {
return handleCache(os.tmpdir(), params);
}
throw err;
} // Otherwise just transform the file
// return it to the user asap and write it in cache
const result = yield transform(source, options);
try {
yield write(file, cacheCompression, result);
} catch (err) {
if (fallback) {
// Fallback to tmpdir if node_modules folder not writable
return handleCache(os.tmpdir(), params);
}
throw err;
}
return result;
});
return function handleCache(_x6, _x7) {
return _ref3.apply(this, arguments);
};
}();
/**
* Retrieve file from cache, or create a new one for future reads
*
* @async
* @param {Object} params
* @param {String} params.cacheDirectory Directory to store cached files
* @param {String} params.cacheIdentifier Unique identifier to bust cache
* @param {Boolean} params.cacheCompression Whether compressing cached files
* @param {String} params.source Original contents of the file to be cached
* @param {Object} params.options Options to be given to the transform fn
*
* @example
*
* const result = await cache({
* cacheDirectory: '.tmp/cache',
* cacheIdentifier: 'babel-loader-cachefile',
* cacheCompression: false,
* source: *source code from file*,
* options: {
* experimental: true,
* runtime: true
* },
* });
*/
module.exports = /*#__PURE__*/function () {
var _ref4 = _asyncToGenerator(function* (params) {
let directory;
if (typeof params.cacheDirectory === "string") {
directory = params.cacheDirectory;
} else {
if (defaultCacheDirectory === null) {
defaultCacheDirectory = findCacheDir({
name: "babel-loader"
}) || os.tmpdir();
}
directory = defaultCacheDirectory;
}
return yield handleCache(directory, params);
});
return function (_x8) {
return _ref4.apply(this, arguments);
};
}();
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