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samples/packages/node_preamble/preamble.js

116 lines
3.3 KiB

// make sure to keep this as 'var'
// we don't want block scoping
var dartNodePreambleSelf = typeof global !== "undefined" ? global : window;
var self = Object.create(dartNodePreambleSelf);
self.scheduleImmediate = typeof setImmediate !== "undefined"
? function (cb) {
setImmediate(cb);
}
: function(cb) {
setTimeout(cb, 0);
};
// CommonJS globals.
self.require = require;
self.exports = exports;
// Node.js specific exports, check to see if they exist & or polyfilled
if (typeof process !== "undefined") {
self.process = process;
}
if (typeof __dirname !== "undefined") {
self.__dirname = __dirname;
}
if (typeof __filename !== "undefined") {
self.__filename = __filename;
}
if (typeof Buffer !== "undefined") {
self.Buffer = Buffer;
}
// if we're running in a browser, Dart supports most of this out of box
// make sure we only run these in Node.js environment
var dartNodeIsActuallyNode = !dartNodePreambleSelf.window
try {
// Check if we're in a Web Worker instead.
if ("undefined" !== typeof WorkerGlobalScope && dartNodePreambleSelf instanceof WorkerGlobalScope) {
dartNodeIsActuallyNode = false;
}
// Check if we're in Electron, with Node.js integration, and override if true.
if ("undefined" !== typeof process && process.versions && process.versions.hasOwnProperty('electron') && process.versions.hasOwnProperty('node')) {
dartNodeIsActuallyNode = true;
}
} catch(e) {}
if (dartNodeIsActuallyNode) {
// This line is to:
// 1) Prevent Webpack from bundling.
// 2) In Webpack on Node.js, make sure we're using the native Node.js require, which is available via __non_webpack_require__
// https://github.com/mbullington/node_preamble.dart/issues/18#issuecomment-527305561
var url = ("undefined" !== typeof __webpack_require__ ? __non_webpack_require__ : require)("url");
self.location = {
get href() {
if (url.pathToFileURL) {
return url.pathToFileURL(process.cwd()).href + "/";
} else {
// This isn't really a correct transformation, but it's the best we have
// for versions of Node <10.12.0 which introduced `url.pathToFileURL()`.
// For example, it will fail for paths that contain characters that need
// to be escaped in URLs.
return "file://" + (function() {
var cwd = process.cwd();
if (process.platform != "win32") return cwd;
return "/" + cwd.replace(/\\/g, "/");
})() + "/"
}
}
};
(function() {
function computeCurrentScript() {
try {
throw new Error();
} catch(e) {
var stack = e.stack;
var re = new RegExp("^ *at [^(]*\\((.*):[0-9]*:[0-9]*\\)$", "mg");
var lastMatch = null;
do {
var match = re.exec(stack);
if (match != null) lastMatch = match;
} while (match != null);
return lastMatch[1];
}
}
var cachedCurrentScript = null;
self.document = {
get currentScript() {
if (cachedCurrentScript == null) {
cachedCurrentScript = {src: computeCurrentScript()};
}
return cachedCurrentScript;
}
};
})();
self.dartDeferredLibraryLoader = function(uri, successCallback, errorCallback) {
try {
load(uri);
successCallback();
} catch (error) {
errorCallback(error);
}
};
}