flow like the river

BACK_BACK/node_modules/parcel-bundler/lib/HMRServer.js

@@ -0,0 +1,173 @@
+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));
+
+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$/.test(n)) return _arrayLikeToArray(o, minLen); }
+
+function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
+
+const http = require('http');
+
+const https = require('https');
+
+const WebSocket = require('ws');
+
+const generateCertificate = require('./utils/generateCertificate');
+
+const getCertificate = require('./utils/getCertificate');
+
+const logger = require('@parcel/logger');
+
+class HMRServer {
+  start(options = {}) {
+    var _this = this;
+
+    return (0, _asyncToGenerator2.default)(function* () {
+      yield new Promise( /*#__PURE__*/function () {
+        var _ref = (0, _asyncToGenerator2.default)(function* (resolve) {
+          if (!options.https) {
+            _this.server = http.createServer();
+          } else if (typeof options.https === 'boolean') {
+            _this.server = https.createServer(generateCertificate(options));
+          } else {
+            _this.server = https.createServer(yield getCertificate(options.https));
+          }
+
+          let websocketOptions = {
+            server: _this.server
+          };
+
+          if (options.hmrHostname) {
+            websocketOptions.origin = `${options.https ? 'https' : 'http'}://${options.hmrHostname}`;
+          }
+
+          _this.wss = new WebSocket.Server(websocketOptions);
+
+          _this.server.listen(options.hmrPort, resolve);
+        });
+
+        return function (_x) {
+          return _ref.apply(this, arguments);
+        };
+      }());
+
+      _this.wss.on('connection', ws => {
+        ws.onerror = _this.handleSocketError;
+
+        if (_this.unresolvedError) {
+          ws.send(JSON.stringify(_this.unresolvedError));
+        }
+      });
+
+      _this.wss.on('error', _this.handleSocketError);
+
+      return _this.wss._server.address().port;
+    })();
+  }
+
+  stop() {
+    this.wss.close();
+    this.server.close();
+  }
+
+  emitError(err) {
+    let _logger$formatError = logger.formatError(err),
+        message = _logger$formatError.message,
+        stack = _logger$formatError.stack; // store the most recent error so we can notify new connections
+    // and so we can broadcast when the error is resolved
+
+
+    this.unresolvedError = {
+      type: 'error',
+      error: {
+        message,
+        stack
+      }
+    };
+    this.broadcast(this.unresolvedError);
+  }
+
+  emitUpdate(assets, reload = false) {
+    if (this.unresolvedError) {
+      this.unresolvedError = null;
+      this.broadcast({
+        type: 'error-resolved'
+      });
+    }
+
+    const shouldReload = reload || assets.some(asset => asset.hmrPageReload);
+
+    if (shouldReload) {
+      this.broadcast({
+        type: 'reload'
+      });
+    } else {
+      this.broadcast({
+        type: 'update',
+        assets: assets.map(asset => {
+          let deps = {};
+
+          var _iterator = _createForOfIteratorHelper(asset.depAssets),
+              _step;
+
+          try {
+            for (_iterator.s(); !(_step = _iterator.n()).done;) {
+              let _step$value = (0, _slicedToArray2.default)(_step.value, 2),
+                  dep = _step$value[0],
+                  depAsset = _step$value[1];
+
+              deps[dep.name] = depAsset.id;
+            }
+          } catch (err) {
+            _iterator.e(err);
+          } finally {
+            _iterator.f();
+          }
+
+          return {
+            id: asset.id,
+            type: asset.type,
+            generated: asset.generated,
+            deps: deps
+          };
+        })
+      });
+    }
+  }
+
+  handleSocketError(err) {
+    if (err.error.code === 'ECONNRESET') {
+      // This gets triggered on page refresh, ignore this
+      return;
+    }
+
+    logger.warn(err);
+  }
+
+  broadcast(msg) {
+    const json = JSON.stringify(msg);
+
+    var _iterator2 = _createForOfIteratorHelper(this.wss.clients),
+        _step2;
+
+    try {
+      for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
+        let ws = _step2.value;
+        ws.send(json);
+      }
+    } catch (err) {
+      _iterator2.e(err);
+    } finally {
+      _iterator2.f();
+    }
+  }
+
+}
+
+module.exports = HMRServer;