process-update.js
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/**
* Based heavily on https://github.com/webpack/webpack/blob/
* c0afdf9c6abc1dd70707c594e473802a566f7b6e/hot/only-dev-server.js
* Original copyright Tobias Koppers @sokra (MIT license)
*/
/* global window __webpack_hash__ */
if (!module.hot) {
throw new Error("[HMR] Hot Module Replacement is disabled.");
}
var hmrDocsUrl = "http://webpack.github.io/docs/hot-module-replacement-with-webpack.html"; // eslint-disable-line max-len
var lastHash;
var failureStatuses = { abort: 1, fail: 1 };
var applyOptions = { ignoreUnaccepted: true };
function upToDate(hash) {
if (hash) lastHash = hash;
return lastHash == __webpack_hash__;
}
module.exports = function(hash, moduleMap, options) {
var reload = options.reload;
if (!upToDate(hash) && module.hot.status() == "idle") {
if (options.log) console.log("[HMR] Checking for updates on the server...");
check();
}
function check() {
var cb = function(err, updatedModules) {
if (err) return handleError(err);
if(!updatedModules) {
if (options.warn) {
console.warn("[HMR] Cannot find update (Full reload needed)");
console.warn("[HMR] (Probably because of restarting the server)");
}
performReload();
return null;
}
var applyCallback = function(applyErr, renewedModules) {
if (applyErr) return handleError(applyErr);
if (!upToDate()) check();
logUpdates(updatedModules, renewedModules);
};
var applyResult = module.hot.apply(applyOptions, applyCallback);
// webpack 2 promise
if (applyResult && applyResult.then) {
// HotModuleReplacement.runtime.js refers to the result as `outdatedModules`
applyResult.then(function(outdatedModules) {
applyCallback(null, outdatedModules);
});
applyResult.catch(applyCallback);
}
};
var result = module.hot.check(false, cb);
// webpack 2 promise
if (result && result.then) {
result.then(function(updatedModules) {
cb(null, updatedModules);
});
result.catch(cb);
}
}
function logUpdates(updatedModules, renewedModules) {
var unacceptedModules = updatedModules.filter(function(moduleId) {
return renewedModules && renewedModules.indexOf(moduleId) < 0;
});
if(unacceptedModules.length > 0) {
if (options.warn) {
console.warn(
"[HMR] The following modules couldn't be hot updated: " +
"(Full reload needed)\n" +
"This is usually because the modules which have changed " +
"(and their parents) do not know how to hot reload themselves. " +
"See " + hmrDocsUrl + " for more details."
);
unacceptedModules.forEach(function(moduleId) {
console.warn("[HMR] - " + moduleMap[moduleId]);
});
}
performReload();
return;
}
if (options.log) {
if(!renewedModules || renewedModules.length === 0) {
console.log("[HMR] Nothing hot updated.");
} else {
console.log("[HMR] Updated modules:");
renewedModules.forEach(function(moduleId) {
console.log("[HMR] - " + moduleMap[moduleId]);
});
}
if (upToDate()) {
console.log("[HMR] App is up to date.");
}
}
}
function handleError(err) {
if (module.hot.status() in failureStatuses) {
if (options.warn) {
console.warn("[HMR] Cannot check for update (Full reload needed)");
console.warn("[HMR] " + err.stack || err.message);
}
performReload();
return;
}
if (options.warn) {
console.warn("[HMR] Update check failed: " + err.stack || err.message);
}
}
function performReload() {
if (reload) {
if (options.warn) console.warn("[HMR] Reloading page");
window.location.reload();
}
}
};