flow like the river

BACK_BACK/node_modules/parcel-bundler/lib/utils/config.js

@@ -0,0 +1,97 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+var _asyncToGenerator2 = _interopRequireDefault(require("@babel/runtime/helpers/asyncToGenerator"));
+
+function _createForOfIteratorHelper(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
+
+function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
+
+const fs = require('@parcel/fs');
+
+const path = require('path');
+
+const clone = require('clone');
+
+const PARSERS = {
+  json: require('json5').parse,
+  toml: require('@iarna/toml').parse
+};
+const existsCache = new Map();
+
+function resolve(_x, _x2) {
+  return _resolve.apply(this, arguments);
+}
+
+function _resolve() {
+  _resolve = (0, _asyncToGenerator2.default)(function* (filepath, filenames, root = path.parse(filepath).root) {
+    filepath = path.dirname(filepath); // Don't traverse above the module root
+
+    if (filepath === root || path.basename(filepath) === 'node_modules') {
+      return null;
+    }
+
+    var _iterator = _createForOfIteratorHelper(filenames),
+        _step;
+
+    try {
+      for (_iterator.s(); !(_step = _iterator.n()).done;) {
+        const filename = _step.value;
+        let file = path.join(filepath, filename);
+        let exists = existsCache.has(file) ? existsCache.get(file) : yield fs.exists(file);
+
+        if (exists) {
+          existsCache.set(file, true);
+          return file;
+        }
+      }
+    } catch (err) {
+      _iterator.e(err);
+    } finally {
+      _iterator.f();
+    }
+
+    return resolve(filepath, filenames, root);
+  });
+  return _resolve.apply(this, arguments);
+}
+
+function load(_x3, _x4) {
+  return _load.apply(this, arguments);
+}
+
+function _load() {
+  _load = (0, _asyncToGenerator2.default)(function* (filepath, filenames, root = path.parse(filepath).root) {
+    let configFile = yield resolve(filepath, filenames, root);
+
+    if (configFile) {
+      try {
+        let extname = path.extname(configFile).slice(1);
+
+        if (extname === 'js') {
+          return clone(require(configFile));
+        }
+
+        let configContent = (yield fs.readFile(configFile)).toString();
+        let parse = PARSERS[extname] || PARSERS.json;
+        return configContent ? parse(configContent) : null;
+      } catch (err) {
+        if (err.code === 'MODULE_NOT_FOUND' || err.code === 'ENOENT') {
+          existsCache.delete(configFile);
+          return null;
+        }
+
+        throw err;
+      }
+    }
+
+    return null;
+  });
+  return _load.apply(this, arguments);
+}
+
+exports.resolve = resolve;
+exports.load = load;