Initial support for remote imports

Makefile

@@ -5,6 +5,7 @@ TS_FILES = \
 	os.ts \
 	runtime.ts \
 	timers.ts \
+	url.js \
 	util.ts
 
 deno: assets.go msg.pb.go main.go

main.go

@@ -6,9 +6,11 @@ import (
 	"github.com/golang/protobuf/proto"
 	"github.com/ry/v8worker2"
 	"io/ioutil"
+	"net/http"
 	"os"
 	"path"
 	"runtime"
+	"strings"
 	"sync"
 	"time"
 )
@@ -28,11 +30,34 @@ func CacheFileName(filename string, sourceCodeBuf []byte) string {
 	return path.Join(CompileDir, cacheKey+".js")
 }
 
+func IsRemotePath(filename string) bool {
+	return strings.HasPrefix(filename, "/$remote$/")
+}
+
+func FetchRemoteSource(remotePath string) (buf []byte, err error) {
+	url := strings.Replace(remotePath, "/$remote$/", "http://", 1)
+	// println("FetchRemoteSource", url)
+	res, err := http.Get(url)
+	if err != nil {
+		return
+	}
+	buf, err = ioutil.ReadAll(res.Body)
+	//println("FetchRemoteSource", err.Error())
+	res.Body.Close()
+	return
+}
+
 func HandleSourceCodeFetch(filename string) []byte {
 	res := &Msg{}
-	sourceCodeBuf, err := Asset("dist/" + filename)
+	var sourceCodeBuf []byte
-	if err != nil {
+	var err error
-		sourceCodeBuf, err = ioutil.ReadFile(filename)
+	if IsRemotePath(filename) {
+		sourceCodeBuf, err = FetchRemoteSource(filename)
+	} else {
+		sourceCodeBuf, err = Asset("dist/" + filename)
+		if err != nil {
+			sourceCodeBuf, err = ioutil.ReadFile(filename)
+		}
 	}
 	if err != nil {
 		res.Error = err.Error()

package.json

@@ -5,11 +5,11 @@
     "fmt": "prettier --write *.ts* *.js *.json"
   },
   "devDependencies": {
-    "@types/text-encoding": "^0.0.32",
+    "http-server": "^0.11.1",
     "parcel-bundler": "^1.8.1",
     "protobufjs": "^6.8.6",
-    "text-encoding": "^0.6.4",
     "tslint": "^5.10.0",
     "typescript": "^2.8.3"
-  }
+  },
+  "dependencies": {}
 }

runtime.ts

@@ -9,6 +9,7 @@ import * as path from "path";
 import * as util from "./util";
 import { log } from "./util";
 import * as os from "./os";
+import "./url";
 
 const EOL = "\n";
 
@@ -26,8 +27,6 @@ export class FileModule {
   private constructor(readonly fileName: string) {
     FileModule.map.set(fileName, this);
 
-    assertValidFileName(this.fileName);
-
     // Load typescript code (sourceCode) and maybe load compiled javascript
     // (outputCode) from cache. If cache is empty, outputCode will be null.
     const { sourceCode, outputCode } = os.sourceCodeFetch(this.fileName);
@@ -49,7 +48,6 @@ export class FileModule {
   }
 
   static load(fileName: string): FileModule {
-    assertValidFileName(fileName);
     let m = this.map.get(fileName);
     if (m == null) {
       m = new this(fileName);
@@ -70,12 +68,6 @@ export class FileModule {
   }
 }
 
-function assertValidFileName(fileName: string): void {
-  if (fileName !== "lib.d.ts") {
-    util.assert(fileName[0] === "/", `fileName must be absolute: ${fileName}`);
-  }
-}
-
 // tslint:disable-next-line:no-any
 type AmdFactory = (...args: any[]) => undefined | object;
 type AmdDefine = (deps: string[], factory: AmdFactory) => void;
@@ -94,8 +86,8 @@ export function makeDefine(fileName: string): AmdDefine {
       } else if (dep === "exports") {
         return localExports;
       } else {
-        dep = resolveModuleName(dep, fileName);
+        const resolved = resolveModuleName(dep, fileName);
-        const depModule = FileModule.load(dep);
+        const depModule = FileModule.load(resolved);
         depModule.compileAndRun();
         return depModule.exports;
       }
@@ -105,8 +97,26 @@ export function makeDefine(fileName: string): AmdDefine {
   return localDefine;
 }
 
-function resolveModuleName(fileName: string, contextFileName: string): string {
+function resolveModuleName(moduleName: string, containingFile: string): string {
-  return path.resolve(path.dirname(contextFileName), fileName);
+  if (isUrl(moduleName)) {
+    // Remove the "http://" from the start of the string.
+    const u = new URL(moduleName);
+    const withoutProtocol = u.toString().replace(u.protocol + "//", "");
+    const name2 = "/$remote$/" + withoutProtocol;
+    return name2;
+  } else if (moduleName.startsWith("/")) {
+    throw Error("Absolute paths not supported");
+  } else {
+    // Relative import.
+    const containingDir = path.dirname(containingFile);
+    const resolvedFileName = path.join(containingDir, moduleName);
+    util.log("relative import", {
+      containingFile,
+      moduleName,
+      resolvedFileName
+    });
+    return resolvedFileName;
+  }
 }
 
 function execute(fileName: string, outputCode: string): void {
@@ -231,24 +241,19 @@ class TypeScriptHost implements ts.LanguageServiceHost {
   ): Array<ts.ResolvedModule | undefined> {
     util.log("resolveModuleNames", { moduleNames, reusedNames });
     return moduleNames.map((name: string) => {
-      if (
+      const resolvedFileName = resolveModuleName(name, containingFile);
-        name.startsWith("/") ||
+      const isExternalLibraryImport = false;
-        name.startsWith("http://") ||
+      return { resolvedFileName, isExternalLibraryImport };
-        name.startsWith("https://")
-      ) {
-        throw Error("Non-relative imports not yet supported.");
-      } else {
-        // Relative import.
-        const containingDir = path.dirname(containingFile);
-        const resolvedFileName = path.join(containingDir, name);
-        util.log("relative import", { containingFile, name, resolvedFileName });
-        const isExternalLibraryImport = false;
-        return { resolvedFileName, isExternalLibraryImport };
-      }
     });
   }
 }
 
+function isUrl(p: string): boolean {
+  return (
+    p.startsWith("//") || p.startsWith("http://") || p.startsWith("https://")
+  );
+}
+
 const formatDiagnosticsHost: ts.FormatDiagnosticsHost = {
   getCurrentDirectory(): string {
     return ".";

test.js

@@ -4,7 +4,22 @@
 
 const fs = require("fs");
 const path = require("path");
-const { execFileSync } = require("child_process");
+const { spawn, execFileSync } = require("child_process");
+
+// Some tests require an HTTP server. We start one here.
+// Because we process tests synchronously in this program we must run
+// the server as a subprocess.
+// Note that "localhost:4545" is hardcoded into the tests at the moment,
+// so if the server runs on a different port, it will fail.
+const httpServerArgs = ["node_modules/.bin/http-server", __dirname, "-p 4545"];
+const server = spawn(process.execPath, httpServerArgs, {
+  cwd: __dirname,
+  stdio: "inherit"
+});
+// TODO: For some reason the http-server doesn't exit properly
+// when this program dies. So we force it with the exit handler here.
+server.unref();
+process.on("exit", () => server.kill("SIGINT"));
 
 const testdataDir = path.join(__dirname, "testdata");
 const denoFn = path.join(__dirname, "deno");
@@ -33,3 +48,5 @@ ${outFileBuffer.toString()}
     `);
   }
 }
+
+console.log("Tests done");

testdata/006_url_imports.ts

@@ -0,0 +1,3 @@
+import { printHello } from "http://localhost:4545/testdata/subdir/print_hello.ts";
+printHello();
+console.log("success");

testdata/006_url_imports.ts.out

@@ -0,0 +1,2 @@
+Hello
+success

tsconfig.json

@@ -8,7 +8,7 @@
     "preserveConstEnums": true,
     "declaration": true,
     "target": "es2017",
-    "lib": ["es2017"],
+    "lib": ["es2017", "DOM"],
     "noEmit": true,
     "noUnusedLocals": true,
     "noImplicitReturns": true,

url.js

@@ -0,0 +1,671 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ * Forked from https://github.com/github/url-polyfill
+ * Version 16c1aa Feb 9 2018.
+ */
+
+(function(scope) {
+  "use strict";
+
+  // feature detect for URL constructor
+  var hasWorkingUrl = false;
+  if (!scope.forceJURL) {
+    try {
+      var u = new URL("b", "http://a");
+      u.pathname = "c%20d";
+      hasWorkingUrl = u.href === "http://a/c%20d";
+    } catch (e) {}
+  }
+
+  if (hasWorkingUrl) return;
+
+  var relative = Object.create(null);
+  relative["ftp"] = 21;
+  relative["file"] = 0;
+  relative["gopher"] = 70;
+  relative["http"] = 80;
+  relative["https"] = 443;
+  relative["ws"] = 80;
+  relative["wss"] = 443;
+
+  var relativePathDotMapping = Object.create(null);
+  relativePathDotMapping["%2e"] = ".";
+  relativePathDotMapping[".%2e"] = "..";
+  relativePathDotMapping["%2e."] = "..";
+  relativePathDotMapping["%2e%2e"] = "..";
+
+  function isRelativeScheme(scheme) {
+    return relative[scheme] !== undefined;
+  }
+
+  function invalid() {
+    clear.call(this);
+    this._isInvalid = true;
+  }
+
+  function IDNAToASCII(h) {
+    if ("" == h) {
+      invalid.call(this);
+    }
+    // XXX
+    return h.toLowerCase();
+  }
+
+  function percentEscape(c) {
+    var unicode = c.charCodeAt(0);
+    if (
+      unicode > 0x20 &&
+      unicode < 0x7f &&
+      // " # < > ? `
+      [0x22, 0x23, 0x3c, 0x3e, 0x3f, 0x60].indexOf(unicode) == -1
+    ) {
+      return c;
+    }
+    return encodeURIComponent(c);
+  }
+
+  function percentEscapeQuery(c) {
+    // XXX This actually needs to encode c using encoding and then
+    // convert the bytes one-by-one.
+
+    var unicode = c.charCodeAt(0);
+    if (
+      unicode > 0x20 &&
+      unicode < 0x7f &&
+      // " # < > ` (do not escape '?')
+      [0x22, 0x23, 0x3c, 0x3e, 0x60].indexOf(unicode) == -1
+    ) {
+      return c;
+    }
+    return encodeURIComponent(c);
+  }
+
+  var EOF = undefined,
+    ALPHA = /[a-zA-Z]/,
+    ALPHANUMERIC = /[a-zA-Z0-9\+\-\.]/;
+
+  function parse(input, stateOverride, base) {
+    function err(message) {
+      errors.push(message);
+    }
+
+    var state = stateOverride || "scheme start",
+      cursor = 0,
+      buffer = "",
+      seenAt = false,
+      seenBracket = false,
+      errors = [];
+
+    loop: while (
+      (input[cursor - 1] != EOF || cursor == 0) &&
+      !this._isInvalid
+    ) {
+      var c = input[cursor];
+      switch (state) {
+        case "scheme start":
+          if (c && ALPHA.test(c)) {
+            buffer += c.toLowerCase(); // ASCII-safe
+            state = "scheme";
+          } else if (!stateOverride) {
+            buffer = "";
+            state = "no scheme";
+            continue;
+          } else {
+            err("Invalid scheme.");
+            break loop;
+          }
+          break;
+
+        case "scheme":
+          if (c && ALPHANUMERIC.test(c)) {
+            buffer += c.toLowerCase(); // ASCII-safe
+          } else if (":" == c) {
+            this._scheme = buffer;
+            buffer = "";
+            if (stateOverride) {
+              break loop;
+            }
+            if (isRelativeScheme(this._scheme)) {
+              this._isRelative = true;
+            }
+            if ("file" == this._scheme) {
+              state = "relative";
+            } else if (
+              this._isRelative &&
+              base &&
+              base._scheme == this._scheme
+            ) {
+              state = "relative or authority";
+            } else if (this._isRelative) {
+              state = "authority first slash";
+            } else {
+              state = "scheme data";
+            }
+          } else if (!stateOverride) {
+            buffer = "";
+            cursor = 0;
+            state = "no scheme";
+            continue;
+          } else if (EOF == c) {
+            break loop;
+          } else {
+            err("Code point not allowed in scheme: " + c);
+            break loop;
+          }
+          break;
+
+        case "scheme data":
+          if ("?" == c) {
+            query = "?";
+            state = "query";
+          } else if ("#" == c) {
+            this._fragment = "#";
+            state = "fragment";
+          } else {
+            // XXX error handling
+            if (EOF != c && "\t" != c && "\n" != c && "\r" != c) {
+              this._schemeData += percentEscape(c);
+            }
+          }
+          break;
+
+        case "no scheme":
+          if (!base || !isRelativeScheme(base._scheme)) {
+            err("Missing scheme.");
+            invalid.call(this);
+          } else {
+            state = "relative";
+            continue;
+          }
+          break;
+
+        case "relative or authority":
+          if ("/" == c && "/" == input[cursor + 1]) {
+            state = "authority ignore slashes";
+          } else {
+            err("Expected /, got: " + c);
+            state = "relative";
+            continue;
+          }
+          break;
+
+        case "relative":
+          this._isRelative = true;
+          if ("file" != this._scheme) this._scheme = base._scheme;
+          if (EOF == c) {
+            this._host = base._host;
+            this._port = base._port;
+            this._path = base._path.slice();
+            this._query = base._query;
+            this._username = base._username;
+            this._password = base._password;
+            break loop;
+          } else if ("/" == c || "\\" == c) {
+            if ("\\" == c) err("\\ is an invalid code point.");
+            state = "relative slash";
+          } else if ("?" == c) {
+            this._host = base._host;
+            this._port = base._port;
+            this._path = base._path.slice();
+            this._query = "?";
+            this._username = base._username;
+            this._password = base._password;
+            state = "query";
+          } else if ("#" == c) {
+            this._host = base._host;
+            this._port = base._port;
+            this._path = base._path.slice();
+            this._query = base._query;
+            this._fragment = "#";
+            this._username = base._username;
+            this._password = base._password;
+            state = "fragment";
+          } else {
+            var nextC = input[cursor + 1];
+            var nextNextC = input[cursor + 2];
+            if (
+              "file" != this._scheme ||
+              !ALPHA.test(c) ||
+              (nextC != ":" && nextC != "|") ||
+              (EOF != nextNextC &&
+                "/" != nextNextC &&
+                "\\" != nextNextC &&
+                "?" != nextNextC &&
+                "#" != nextNextC)
+            ) {
+              this._host = base._host;
+              this._port = base._port;
+              this._username = base._username;
+              this._password = base._password;
+              this._path = base._path.slice();
+              this._path.pop();
+            }
+            state = "relative path";
+            continue;
+          }
+          break;
+
+        case "relative slash":
+          if ("/" == c || "\\" == c) {
+            if ("\\" == c) {
+              err("\\ is an invalid code point.");
+            }
+            if ("file" == this._scheme) {
+              state = "file host";
+            } else {
+              state = "authority ignore slashes";
+            }
+          } else {
+            if ("file" != this._scheme) {
+              this._host = base._host;
+              this._port = base._port;
+              this._username = base._username;
+              this._password = base._password;
+            }
+            state = "relative path";
+            continue;
+          }
+          break;
+
+        case "authority first slash":
+          if ("/" == c) {
+            state = "authority second slash";
+          } else {
+            err("Expected '/', got: " + c);
+            state = "authority ignore slashes";
+            continue;
+          }
+          break;
+
+        case "authority second slash":
+          state = "authority ignore slashes";
+          if ("/" != c) {
+            err("Expected '/', got: " + c);
+            continue;
+          }
+          break;
+
+        case "authority ignore slashes":
+          if ("/" != c && "\\" != c) {
+            state = "authority";
+            continue;
+          } else {
+            err("Expected authority, got: " + c);
+          }
+          break;
+
+        case "authority":
+          if ("@" == c) {
+            if (seenAt) {
+              err("@ already seen.");
+              buffer += "%40";
+            }
+            seenAt = true;
+            for (var i = 0; i < buffer.length; i++) {
+              var cp = buffer[i];
+              if ("\t" == cp || "\n" == cp || "\r" == cp) {
+                err("Invalid whitespace in authority.");
+                continue;
+              }
+              // XXX check URL code points
+              if (":" == cp && null === this._password) {
+                this._password = "";
+                continue;
+              }
+              var tempC = percentEscape(cp);
+              null !== this._password
+                ? (this._password += tempC)
+                : (this._username += tempC);
+            }
+            buffer = "";
+          } else if (
+            EOF == c ||
+            "/" == c ||
+            "\\" == c ||
+            "?" == c ||
+            "#" == c
+          ) {
+            cursor -= buffer.length;
+            buffer = "";
+            state = "host";
+            continue;
+          } else {
+            buffer += c;
+          }
+          break;
+
+        case "file host":
+          if (EOF == c || "/" == c || "\\" == c || "?" == c || "#" == c) {
+            if (
+              buffer.length == 2 &&
+              ALPHA.test(buffer[0]) &&
+              (buffer[1] == ":" || buffer[1] == "|")
+            ) {
+              state = "relative path";
+            } else if (buffer.length == 0) {
+              state = "relative path start";
+            } else {
+              this._host = IDNAToASCII.call(this, buffer);
+              buffer = "";
+              state = "relative path start";
+            }
+            continue;
+          } else if ("\t" == c || "\n" == c || "\r" == c) {
+            err("Invalid whitespace in file host.");
+          } else {
+            buffer += c;
+          }
+          break;
+
+        case "host":
+        case "hostname":
+          if (":" == c && !seenBracket) {
+            // XXX host parsing
+            this._host = IDNAToASCII.call(this, buffer);
+            buffer = "";
+            state = "port";
+            if ("hostname" == stateOverride) {
+              break loop;
+            }
+          } else if (
+            EOF == c ||
+            "/" == c ||
+            "\\" == c ||
+            "?" == c ||
+            "#" == c
+          ) {
+            this._host = IDNAToASCII.call(this, buffer);
+            buffer = "";
+            state = "relative path start";
+            if (stateOverride) {
+              break loop;
+            }
+            continue;
+          } else if ("\t" != c && "\n" != c && "\r" != c) {
+            if ("[" == c) {
+              seenBracket = true;
+            } else if ("]" == c) {
+              seenBracket = false;
+            }
+            buffer += c;
+          } else {
+            err("Invalid code point in host/hostname: " + c);
+          }
+          break;
+
+        case "port":
+          if (/[0-9]/.test(c)) {
+            buffer += c;
+          } else if (
+            EOF == c ||
+            "/" == c ||
+            "\\" == c ||
+            "?" == c ||
+            "#" == c ||
+            stateOverride
+          ) {
+            if ("" != buffer) {
+              var temp = parseInt(buffer, 10);
+              if (temp != relative[this._scheme]) {
+                this._port = temp + "";
+              }
+              buffer = "";
+            }
+            if (stateOverride) {
+              break loop;
+            }
+            state = "relative path start";
+            continue;
+          } else if ("\t" == c || "\n" == c || "\r" == c) {
+            err("Invalid code point in port: " + c);
+          } else {
+            invalid.call(this);
+          }
+          break;
+
+        case "relative path start":
+          if ("\\" == c) err("'\\' not allowed in path.");
+          state = "relative path";
+          if ("/" != c && "\\" != c) {
+            continue;
+          }
+          break;
+
+        case "relative path":
+          if (
+            EOF == c ||
+            "/" == c ||
+            "\\" == c ||
+            (!stateOverride && ("?" == c || "#" == c))
+          ) {
+            if ("\\" == c) {
+              err("\\ not allowed in relative path.");
+            }
+            var tmp;
+            if ((tmp = relativePathDotMapping[buffer.toLowerCase()])) {
+              buffer = tmp;
+            }
+            if (".." == buffer) {
+              this._path.pop();
+              if ("/" != c && "\\" != c) {
+                this._path.push("");
+              }
+            } else if ("." == buffer && "/" != c && "\\" != c) {
+              this._path.push("");
+            } else if ("." != buffer) {
+              if (
+                "file" == this._scheme &&
+                this._path.length == 0 &&
+                buffer.length == 2 &&
+                ALPHA.test(buffer[0]) &&
+                buffer[1] == "|"
+              ) {
+                buffer = buffer[0] + ":";
+              }
+              this._path.push(buffer);
+            }
+            buffer = "";
+            if ("?" == c) {
+              this._query = "?";
+              state = "query";
+            } else if ("#" == c) {
+              this._fragment = "#";
+              state = "fragment";
+            }
+          } else if ("\t" != c && "\n" != c && "\r" != c) {
+            buffer += percentEscape(c);
+          }
+          break;
+
+        case "query":
+          if (!stateOverride && "#" == c) {
+            this._fragment = "#";
+            state = "fragment";
+          } else if (EOF != c && "\t" != c && "\n" != c && "\r" != c) {
+            this._query += percentEscapeQuery(c);
+          }
+          break;
+
+        case "fragment":
+          if (EOF != c && "\t" != c && "\n" != c && "\r" != c) {
+            this._fragment += c;
+          }
+          break;
+      }
+
+      cursor++;
+    }
+  }
+
+  function clear() {
+    this._scheme = "";
+    this._schemeData = "";
+    this._username = "";
+    this._password = null;
+    this._host = "";
+    this._port = "";
+    this._path = [];
+    this._query = "";
+    this._fragment = "";
+    this._isInvalid = false;
+    this._isRelative = false;
+  }
+
+  // Does not process domain names or IP addresses.
+  // Does not handle encoding for the query parameter.
+  function jURL(url, base /* , encoding */) {
+    if (base !== undefined && !(base instanceof jURL))
+      base = new jURL(String(base));
+
+    url = String(url);
+
+    this._url = url;
+    clear.call(this);
+
+    var input = url.replace(/^[ \t\r\n\f]+|[ \t\r\n\f]+$/g, "");
+    // encoding = encoding || 'utf-8'
+
+    parse.call(this, input, null, base);
+  }
+
+  jURL.prototype = {
+    toString: function() {
+      return this.href;
+    },
+    get href() {
+      if (this._isInvalid) return this._url;
+
+      var authority = "";
+      if ("" != this._username || null != this._password) {
+        authority =
+          this._username +
+          (null != this._password ? ":" + this._password : "") +
+          "@";
+      }
+
+      return (
+        this.protocol +
+        (this._isRelative ? "//" + authority + this.host : "") +
+        this.pathname +
+        this._query +
+        this._fragment
+      );
+    },
+    set href(href) {
+      clear.call(this);
+      parse.call(this, href);
+    },
+
+    get protocol() {
+      return this._scheme + ":";
+    },
+    set protocol(protocol) {
+      if (this._isInvalid) return;
+      parse.call(this, protocol + ":", "scheme start");
+    },
+
+    get host() {
+      return this._isInvalid
+        ? ""
+        : this._port
+          ? this._host + ":" + this._port
+          : this._host;
+    },
+    set host(host) {
+      if (this._isInvalid || !this._isRelative) return;
+      parse.call(this, host, "host");
+    },
+
+    get hostname() {
+      return this._host;
+    },
+    set hostname(hostname) {
+      if (this._isInvalid || !this._isRelative) return;
+      parse.call(this, hostname, "hostname");
+    },
+
+    get port() {
+      return this._port;
+    },
+    set port(port) {
+      if (this._isInvalid || !this._isRelative) return;
+      parse.call(this, port, "port");
+    },
+
+    get pathname() {
+      return this._isInvalid
+        ? ""
+        : this._isRelative
+          ? "/" + this._path.join("/")
+          : this._schemeData;
+    },
+    set pathname(pathname) {
+      if (this._isInvalid || !this._isRelative) return;
+      this._path = [];
+      parse.call(this, pathname, "relative path start");
+    },
+
+    get search() {
+      return this._isInvalid || !this._query || "?" == this._query
+        ? ""
+        : this._query;
+    },
+    set search(search) {
+      if (this._isInvalid || !this._isRelative) return;
+      this._query = "?";
+      if ("?" == search[0]) search = search.slice(1);
+      parse.call(this, search, "query");
+    },
+
+    get hash() {
+      return this._isInvalid || !this._fragment || "#" == this._fragment
+        ? ""
+        : this._fragment;
+    },
+    set hash(hash) {
+      if (this._isInvalid) return;
+      this._fragment = "#";
+      if ("#" == hash[0]) hash = hash.slice(1);
+      parse.call(this, hash, "fragment");
+    },
+
+    get origin() {
+      var host;
+      if (this._isInvalid || !this._scheme) {
+        return "";
+      }
+      // javascript: Gecko returns String(""), WebKit/Blink String("null")
+      // Gecko throws error for "data://"
+      // data: Gecko returns "", Blink returns "data://", WebKit returns "null"
+      // Gecko returns String("") for file: mailto:
+      // WebKit/Blink returns String("SCHEME://") for file: mailto:
+      switch (this._scheme) {
+        case "data":
+        case "file":
+        case "javascript":
+        case "mailto":
+          return "null";
+      }
+      host = this.host;
+      if (!host) {
+        return "";
+      }
+      return this._scheme + "://" + host;
+    }
+  };
+
+  // Copy over the static methods
+  var OriginalURL = scope.URL;
+  if (OriginalURL) {
+    jURL.createObjectURL = function(blob) {
+      // IE extension allows a second optional options argument.
+      // http://msdn.microsoft.com/en-us/library/ie/hh772302(v=vs.85).aspx
+      return OriginalURL.createObjectURL.apply(OriginalURL, arguments);
+    };
+    jURL.revokeObjectURL = function(url) {
+      OriginalURL.revokeObjectURL(url);
+    };
+  }
+
+  scope.URL = jURL;
+})(window);

util.ts

@@ -9,6 +9,8 @@ export const globalEval = eval;
 // TODO The underscore is because it's conflicting with @types/node.
 export const _global = globalEval("this");
 
+_global["window"] = _global; // Create a window object.
+
 const print = V8Worker2.print;
 
 // To control internal logging output

yarn.lock

@@ -53,10 +53,6 @@
   version "8.10.14"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-8.10.14.tgz#a24767cfa22023f1bf7e751c0ead56a14c07ed45"
 
-"@types/text-encoding@^0.0.32":
-  version "0.0.32"
-  resolved "https://registry.yarnpkg.com/@types/text-encoding/-/text-encoding-0.0.32.tgz#52289b320a406850b14f08f48b475ca021218048"
-
 abbrev@1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
@@ -153,6 +149,10 @@ async-limiter@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.0.tgz#78faed8c3d074ab81f22b4e985d79e8738f720f8"
 
+async@^1.5.2:
+  version "1.5.2"
+  resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
+
 atob@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.1.tgz#ae2d5a729477f289d60dd7f96a6314a22dd6c22a"
@@ -983,6 +983,10 @@ colormin@^1.0.5:
     css-color-names "0.0.4"
     has "^1.0.1"
 
+colors@1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/colors/-/colors-1.0.3.tgz#0433f44d809680fdeb60ed260f1b0c262e82a40b"
+
 colors@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/colors/-/colors-1.1.2.tgz#168a4701756b6a7f51a12ce0c97bfa28c084ed63"
@@ -1053,6 +1057,10 @@ core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
+corser@~2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/corser/-/corser-2.0.1.tgz#8eda252ecaab5840dcd975ceb90d9370c819ff87"
+
 create-ecdh@^4.0.0:
   version "4.0.3"
   resolved "https://registry.yarnpkg.com/create-ecdh/-/create-ecdh-4.0.3.tgz#c9111b6f33045c4697f144787f9254cdc77c45ff"
@@ -1213,6 +1221,12 @@ debug@2.6.9, debug@^2.1.2, debug@^2.2.0, debug@^2.3.3, debug@^2.6.8, debug@^2.6.
   dependencies:
     ms "2.0.0"
 
+debug@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
+  dependencies:
+    ms "2.0.0"
+
 decamelize@^1.1.2:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
@@ -1349,6 +1363,15 @@ duplexer2@~0.1.4:
   dependencies:
     readable-stream "^2.0.2"
 
+ecstatic@^3.0.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/ecstatic/-/ecstatic-3.2.0.tgz#1b1aee1ca7c6b99cfb5cf6c9b26b481b90c4409f"
+  dependencies:
+    he "^1.1.1"
+    mime "^1.4.1"
+    minimist "^1.1.0"
+    url-join "^2.0.2"
+
 editorconfig@^0.13.2:
   version "0.13.3"
   resolved "https://registry.yarnpkg.com/editorconfig/-/editorconfig-0.13.3.tgz#e5219e587951d60958fd94ea9a9a008cdeff1b34"
@@ -1448,6 +1471,10 @@ etag@~1.8.1:
   version "1.8.1"
   resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
 
+eventemitter3@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/eventemitter3/-/eventemitter3-3.1.0.tgz#090b4d6cdbd645ed10bf750d4b5407942d7ba163"
+
 events@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/events/-/events-1.1.1.tgz#9ebdb7635ad099c70dcc4c2a1f5004288e8bd924"
@@ -1527,6 +1554,12 @@ flatten@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/flatten/-/flatten-1.0.2.tgz#dae46a9d78fbe25292258cc1e780a41d95c03782"
 
+follow-redirects@^1.0.0:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.4.1.tgz#d8120f4518190f55aac65bb6fc7b85fcd666d6aa"
+  dependencies:
+    debug "^3.1.0"
+
 for-in@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
@@ -1685,6 +1718,10 @@ hash.js@^1.0.0, hash.js@^1.0.3:
     inherits "^2.0.3"
     minimalistic-assert "^1.0.0"
 
+he@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/he/-/he-1.1.1.tgz#93410fd21b009735151f8868c2f271f3427e23fd"
+
 hmac-drbg@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
@@ -1735,6 +1772,27 @@ http-errors@~1.6.2:
     setprototypeof "1.1.0"
     statuses ">= 1.4.0 < 2"
 
+http-proxy@^1.8.1:
+  version "1.17.0"
+  resolved "https://registry.yarnpkg.com/http-proxy/-/http-proxy-1.17.0.tgz#7ad38494658f84605e2f6db4436df410f4e5be9a"
+  dependencies:
+    eventemitter3 "^3.0.0"
+    follow-redirects "^1.0.0"
+    requires-port "^1.0.0"
+
+http-server@^0.11.1:
+  version "0.11.1"
+  resolved "https://registry.yarnpkg.com/http-server/-/http-server-0.11.1.tgz#2302a56a6ffef7f9abea0147d838a5e9b6b6a79b"
+  dependencies:
+    colors "1.0.3"
+    corser "~2.0.0"
+    ecstatic "^3.0.0"
+    http-proxy "^1.8.1"
+    opener "~1.4.0"
+    optimist "0.6.x"
+    portfinder "^1.0.13"
+    union "~0.4.3"
+
 https-browserify@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/https-browserify/-/https-browserify-1.0.0.tgz#ec06c10e0a34c0f2faf199f7fd7fc78fffd03c73"
@@ -2149,6 +2207,10 @@ mime@1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/mime/-/mime-1.4.1.tgz#121f9ebc49e3766f311a76e1fa1c8003c4b03aa6"
 
+mime@^1.4.1:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/mime/-/mime-1.6.0.tgz#32cd9e5c64553bd58d19a568af452acff04981b1"
+
 minimalistic-assert@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz#2e194de044626d4a10e7f7fbc00ce73e83e4d5c7"
@@ -2167,10 +2229,14 @@ minimist@0.0.8:
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
-minimist@^1.1.3, minimist@^1.2.0:
+minimist@^1.1.0, minimist@^1.1.3, minimist@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
+minimist@~0.0.1:
+  version "0.0.10"
+  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.10.tgz#de3f98543dbf96082be48ad1a0c7cda836301dcf"
+
 minipass@^2.2.1, minipass@^2.2.4:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/minipass/-/minipass-2.3.0.tgz#2e11b1c46df7fe7f1afbe9a490280add21ffe384"
@@ -2191,7 +2257,7 @@ mixin-deep@^1.2.0:
     for-in "^1.0.2"
     is-extendable "^1.0.1"
 
-mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0, mkdirp@~0.5.1:
+mkdirp@0.5.x, mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.0, mkdirp@~0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies:
@@ -2407,12 +2473,23 @@ once@^1.3.0:
   dependencies:
     wrappy "1"
 
+opener@~1.4.0:
+  version "1.4.3"
+  resolved "https://registry.yarnpkg.com/opener/-/opener-1.4.3.tgz#5c6da2c5d7e5831e8ffa3964950f8d6674ac90b8"
+
 opn@^5.1.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/opn/-/opn-5.3.0.tgz#64871565c863875f052cfdf53d3e3cb5adb53b1c"
   dependencies:
     is-wsl "^1.1.0"
 
+optimist@0.6.x:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/optimist/-/optimist-0.6.1.tgz#da3ea74686fa21a19a111c326e90eb15a0196686"
+  dependencies:
+    minimist "~0.0.1"
+    wordwrap "~0.0.2"
+
 optionator@^0.8.1:
   version "0.8.2"
   resolved "https://registry.yarnpkg.com/optionator/-/optionator-0.8.2.tgz#364c5e409d3f4d6301d6c0b4c05bba50180aeb64"
@@ -2558,6 +2635,14 @@ physical-cpu-count@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/physical-cpu-count/-/physical-cpu-count-2.0.0.tgz#18de2f97e4bf7a9551ad7511942b5496f7aba660"
 
+portfinder@^1.0.13:
+  version "1.0.13"
+  resolved "https://registry.yarnpkg.com/portfinder/-/portfinder-1.0.13.tgz#bb32ecd87c27104ae6ee44b5a3ccbf0ebb1aede9"
+  dependencies:
+    async "^1.5.2"
+    debug "^2.2.0"
+    mkdirp "0.5.x"
+
 posix-character-classes@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
@@ -2816,10 +2901,6 @@ prepend-http@^1.0.0:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
 
-prettier@^1.12.1:
-  version "1.12.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.12.1.tgz#c1ad20e803e7749faf905a409d2367e06bbe7325"
-
 private@^0.1.6, private@^0.1.8:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"
@@ -2880,6 +2961,10 @@ q@^1.1.2:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.1.tgz#7e32f75b41381291d04611f1bf14109ac00651d7"
 
+qs@~2.3.3:
+  version "2.3.3"
+  resolved "https://registry.yarnpkg.com/qs/-/qs-2.3.3.tgz#e9e85adbe75da0bbe4c8e0476a086290f863b404"
+
 query-string@^4.1.0:
   version "4.3.4"
   resolved "https://registry.yarnpkg.com/query-string/-/query-string-4.3.4.tgz#bbb693b9ca915c232515b228b1a02b609043dbeb"
@@ -3023,6 +3108,10 @@ repeating@^2.0.0:
   dependencies:
     is-finite "^1.0.0"
 
+requires-port@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/requires-port/-/requires-port-1.0.0.tgz#925d2601d39ac485e091cf0da5c6e694dc3dcaff"
+
 resolve-url@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
@@ -3404,10 +3493,6 @@ tar@^4:
     safe-buffer "^5.1.2"
     yallist "^3.0.2"
 
-text-encoding@^0.6.4:
-  version "0.6.4"
-  resolved "https://registry.yarnpkg.com/text-encoding/-/text-encoding-0.6.4.tgz#e399a982257a276dae428bb92845cb71bdc26d19"
-
 through2@^2.0.0, through2@~2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/through2/-/through2-2.0.3.tgz#0004569b37c7c74ba39c43f3ced78d1ad94140be"
@@ -3535,6 +3620,12 @@ union-value@^1.0.0:
     is-extendable "^0.1.1"
     set-value "^0.4.3"
 
+union@~0.4.3:
+  version "0.4.6"
+  resolved "https://registry.yarnpkg.com/union/-/union-0.4.6.tgz#198fbdaeba254e788b0efcb630bc11f24a2959e0"
+  dependencies:
+    qs "~2.3.3"
+
 uniq@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/uniq/-/uniq-1.0.1.tgz#b31c5ae8254844a3a8281541ce2b04b865a734ff"
@@ -3568,6 +3659,10 @@ urix@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/urix/-/urix-0.1.0.tgz#da937f7a62e21fec1fd18d49b35c2935067a6c72"
 
+url-join@^2.0.2:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/url-join/-/url-join-2.0.5.tgz#5af22f18c052a000a48d7b82c5e9c2e2feeda728"
+
 url@^0.11.0:
   version "0.11.0"
   resolved "https://registry.yarnpkg.com/url/-/url-0.11.0.tgz#3838e97cfc60521eb73c525a8e55bfdd9e2e28f1"
@@ -3632,6 +3727,10 @@ wide-align@^1.1.0:
   dependencies:
     string-width "^1.0.2"
 
+wordwrap@~0.0.2:
+  version "0.0.3"
+  resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-0.0.3.tgz#a3d5da6cd5c0bc0008d37234bbaf1bed63059107"
+
 wordwrap@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-1.0.0.tgz#27584810891456a4171c8d0226441ade90cbcaeb"