signal.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
/*globals __resourceQuery */
if (module.hot) {
var log = require("./log");
var checkForUpdate = function checkForUpdate(fromUpdate) {
module.hot
.check()
.then(function(updatedModules) {
if (!updatedModules) {
if (fromUpdate) log("info", "[HMR] Update applied.");
else log("warning", "[HMR] Cannot find update.");
return;
}
return module.hot
.apply({
ignoreUnaccepted: true,
onUnaccepted: function(data) {
log(
"warning",
"Ignored an update to unaccepted module " +
data.chain.join(" -> ")
);
}
})
.then(function(renewedModules) {
require("./log-apply-result")(updatedModules, renewedModules);
checkForUpdate(true);
return null;
});
})
.catch(function(err) {
var status = module.hot.status();
if (["abort", "fail"].indexOf(status) >= 0) {
log("warning", "[HMR] Cannot apply update.");
log("warning", "[HMR] " + log.formatError(err));
log("warning", "[HMR] You need to restart the application!");
} else {
log("warning", "[HMR] Update failed: " + (err.stack || err.message));
}
});
};
process.on(__resourceQuery.substr(1) || "SIGUSR2", function() {
if (module.hot.status() !== "idle") {
log(
"warning",
"[HMR] Got signal but currently in " + module.hot.status() + " state."
);
log("warning", "[HMR] Need to be in idle state to start hot update.");
return;
}
checkForUpdate();
});
} else {
throw new Error("[HMR] Hot Module Replacement is disabled.");
}