gulp@4.0.0-alpha.3 breaks gulp scripts with vinyl issue "file.isSymbolic is not a function"

[dozer75]

It seems that during this night the alpha.3 package was released of gulp. But when running typescript compiling using this, i get a stacktrace that states TypeError: file.isSymbolic is not a function

The complete stacktrace for this is:

    at DestroyableTransform.normalize [as _transform] (C:\Temp\Project\node_modules\vinyl-fs\lib\dest\prepare.js:31:15)
    at DestroyableTransform.Transform._read (C:\Temp\Project\node_modules\readable-stream\lib\_stream_transform.js:182:10)
    at DestroyableTransform.Transform._write (C:\Temp\Project\node_modules\readable-stream\lib\_stream_transform.js:170:83)
    at doWrite (C:\Temp\Project\node_modules\readable-stream\lib\_stream_writable.js:406:64)
    at writeOrBuffer (C:\Temp\Project\node_modules\readable-stream\lib\_stream_writable.js:395:5)
    at DestroyableTransform.Writable.write (C:\Temp\Project\node_modules\readable-stream\lib\_stream_writable.js:322:11)
    at Pumpify.Duplexify._write (C:\Temp\Project\node_modules\duplexify\index.js:201:22)
    at doWrite (C:\Temp\Project\node_modules\readable-stream\lib\_stream_writable.js:406:64)
    at writeOrBuffer (C:\Temp\Project\node_modules\readable-stream\lib\_stream_writable.js:395:5)
    at Pumpify.Writable.write (C:\Temp\Project\node_modules\readable-stream\lib\_stream_writable.js:322:11)
    at DestroyableTransform.ondata (C:\Temp\Project\node_modules\readable-stream\lib\_stream_readable.js:612:20)
    at emitOne (events.js:96:13)
    at DestroyableTransform.emit (events.js:188:7)
    at addChunk (C:\Temp\Project\node_modules\readable-stream\lib\_stream_readable.js:284:12)
    at readableAddChunk (C:\Temp\Project\node_modules\readable-stream\lib\_stream_readable.js:271:11)
    at DestroyableTransform.Readable.push (C:\Temp\Project\node_modules\readable-stream\lib\_stream_readable.js:238:10)
    at DestroyableTransform.Transform.push (C:\Temp\Project\node_modules\readable-stream\lib\_stream_transform.js:146:32)

I install gulp using npm with the following configuration in package.json:

"gulp": "github:gulpjs/gulp#4.0"

Please post a sample of your gulpfile (preferably reduced to just the bit that's not working)

var gulp = require("gulp");
var typescript = require("gulp-typescript");
var sourcemaps = require("gulp-sourcemaps");


var typescriptCompile = function (file, done) {
    const tsProject = typescript.createProject("tsconfig.json");

    if (file === null) {
        file = srcPaths.typescript + "**/*.ts";
    } else {
        console.log(`Compiling ${ file }`);
    }

    gulp.src(file)
        .pipe(sourcemaps.init())
        .pipe(tsProject())
        .js
        .pipe(sourcemaps.write(".", {
            includeContent: true, mapSources: function (sourcePath) {
                while (sourcePath.startsWith("../")) {
                    sourcePath = sourcePath.replace("../", "");
                }

                return `/${sourcePath}`;
            } }))
        .pipe(gulp.dest(destPaths.app))
        .on("end", done);
};

gulp.task("compile.typescript", function (done) {
    typescriptCompile(null, done);
});

What version of gulp are you using?
Gulp 4.0 alpha 3

What versions of npm and node are you using?
npm version 3.10.10
node version v6.10.2

[phated]

If you are encountering this error, please see the blog post at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5

With the release of vinyl-fs 3.0.1, we've added a temporary fix that converts old Vinyl objects to new ones required by vinyl-fs. If you are having this problem, please ensure you have the very latest vinyl-fs dependency.