Make sure output directories exist before writing a file

cli/asc.js

@@ -19,6 +19,7 @@ const path = require("path");
 const utf8 = require("@protobufjs/utf8");
 const colorsUtil = require("./util/colors");
 const optionsUtil = require("./util/options");
+const mkdirp = require("./util/mkdirp");
 const EOL = process.platform === "win32" ? "\r\n" : "\n";
 
 // Emscripten adds an `uncaughtException` listener to Binaryen that results in an additional
@@ -704,6 +705,7 @@ exports.main = function main(argv, options, callback) {
     try {
       stats.writeCount++;
       stats.writeTime += measure(() => {
+        mkdirp(path.dirname(filename));
         if (typeof contents === "string") {
           fs.writeFileSync(filename, contents, { encoding: "utf8" } );
         } else {

cli/util/mkdirp.d.ts

@@ -0,0 +1,5 @@
+interface Options {
+  mode?: number;
+}
+declare function mkdirp(path: string, options?: Options): string | null;
+export = mkdirp;

cli/util/mkdirp.js

@@ -0,0 +1,60 @@
+/*
+Copyright 2010 James Halliday (mail@substack.net)
+
+This project is free software released under the MIT/X11 license:
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+var path = require("path");
+var fs = require("fs");
+var _0777 = parseInt("0777", 8);
+
+module.exports = function mkdirp(p, opts, made) {
+  if (!opts || typeof opts !== "object") {
+    opts = { mode: opts };
+  }
+  var mode = opts.mode;
+  if (mode === undefined) {
+    mode = _0777 & (~process.umask());
+  }
+  if (!made) made = null;
+  p = path.resolve(p);
+  try {
+    fs.mkdirSync(p, mode);
+    made = made || p;
+  } catch (err0) {
+    switch (err0.code) {
+      case "ENOENT":
+        made = mkdirp(path.dirname(p), opts, made);
+        mkdirp(p, opts, made);
+        break;
+      default:
+        var stat;
+        try {
+          stat = fs.statSync(p);
+        } catch (err1) {
+          throw err0;
+        }
+        if (!stat.isDirectory()) throw err0;
+        break;
+    }
+  }
+  return made;
+};