报错：

error TS1219: Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option in your 'tsconfig' or 'jsconfig' to remove this warning.

原文：

1.gulpfile.js内容如下：

var gulp = require("gulp"),
    tsc = require("gulp-typescript"),
    typescript = require("typescript");

var tsProject = tsc.createProject({
    removeComments: false,
    noImplicitAny: false,
    target: "es5",
    module: "commonjs",
    declarationFiles: false,
    emitDecoratorMetadata: true,
    typescript: typescript
});

gulp.task("build-source", function () {
    return gulp.src(__dirname + "/file.ts")
    .pipe(tsc(tsProject))
    .js.pipe(gulp.dest(__dirname +"/"))
});

2.file.ts内容如下：

@logClass
class Person {
    
    public name: string;
    public surname: string;

    constructor(name: string, surname: string) {
        this.name = name;
        this.surname = surname;
    }

    public saySomething(something: string): string {
        return this.name + " " + this.surname + " says:" + something;
    }
}

function logClass(target: any) {
    var original = target;
    
    function construct(constructor, args) {
        var c: any = function() {
            return constructor.apply(this, args);
        }
        c.prototype = constructor.prototype;
        return new c();
    }

    var f:any = function(...args) {
        console.log("NEW: " + original.name);
        return construct(original, args);
    }

    f.prototype = original.prototype;

    return f;
}

解决方法：

gulpfile.js文件添加experimentalDecorators并设置为true.

var tsProject = tsc.createProject({
     ... ...
    experimentalDecorators: true,
});