/**
  * Runs unit-tests.
  */
 @Task()
 unit() {
     chai.should();
     chai.use(require("sinon-chai"));
     return gulp.src("./build/es5/test/unit/**/*.js")
         .pipe(mocha());
 }

 /**
  * Publishes a package to npm from ./build/package directory with @next tag.
  */
 @Task()
 packagePublishNext() {
     return gulp.src("package.json", { read: false })
         .pipe(shell([
             "cd ./build/package && npm publish --tag next"
         ]));
 }

 /**
  * Publishes a package to npm from ./build/package directory.
  */
 @Task()
 npmPublish() {
     return gulp.src("package.json", { read: false })
         .pipe(shell([
             "cd ./build/package && npm publish"
         ]));
 }

 /**
  * Runs typescript files compilation.
  */
 @Task()
 compile() {
     return gulp.src("package.json", { read: false })
         .pipe(shell([
             "\"node_modules/.bin/ngc\" -p tsconfig-aot.json"
         ]));
 }

 /**
  * Removes /// <reference from compiled sources.
  */
 @Task()
 packageReplaceReferences() {
     return gulp.src("./build/package/**/*.d.ts")
         .pipe(replace(`/// <reference types="node" />`, ""))
         .pipe(replace(`/// <reference types="chai" />`, ""))
         .pipe(gulp.dest("./build/package"));
 }

 /**
  * Runs unit-tests.
  */
 @Task()
 unit() {
     chai.should();
     chai.use(require("sinon-chai"));
     chai.use(require("chai-as-promised"));
     return gulp.src("./build/compiled/test/**/*.js")
         .pipe(mocha());
 }

    // -------------------------------------------------------------------------
    // General tasks
    // -------------------------------------------------------------------------

    /**
     * Cleans build folder.
     */
    @Task()
    clean(cb: Function) {
        return del([
            "build/**",
            "!build",
            "!build/package",
            "!build/package/node_modules",
            "!build/package/node_modules/**"
        ], cb);
    }

    // -------------------------------------------------------------------------
    // Run tests tasks
    // -------------------------------------------------------------------------

    /**
     * Runs ts linting to validate source code.
     */
    @Task()
    tslint() {
        return gulp.src(["./src/**/*.ts", "./test/**/*.ts", "./sample/**/*.ts"])
            .pipe(tslint())
            .pipe(tslint.report(stylish, {
                emitError: true,
                sort: true,
                bell: true
            }));
    }

 /**
  * Runs post coverage operations.
  */
 @Task("coveragePost", ["coveragePre"])
 coveragePost() {
     chai.should();
     chai.use(require("sinon-chai"));
     chai.use(require("chai-as-promised"));
     
     return gulp.src(["./build/es5/test/**/*.js"])
         .pipe(mocha())
         .pipe(istanbul.writeReports());
 }

    // -------------------------------------------------------------------------
    // Build and packaging for browser
    // -------------------------------------------------------------------------

    /**
     * Copies all source files into destination folder in a correct structure.
     */
    @Task()
    browserCopySources() {
        return gulp.src([
            "./src/**/*.ts",
            "!./src/commands/*.ts",
            "!./src/cli.ts",
            "!./src/typeorm.ts",
            "!./src/typeorm-model-shim.ts",
            "!./src/platform/PlatformTools.ts"
        ])
        .pipe(gulp.dest("./build/browser/src"));
    }