还有其他方法可以在Gulp中编写Watch函数，我试图在gulp中执行命令，但它显示了错误

Question

我正在尝试安装node.js。安装过程成功。但是，当我在终端中运行gulp命令时，出现此错误。

PS C:\Users\Gayatree\test-widget> gulp
[15:32:28] Using gulpfile ~\test-widget\gulpfile.js
[15:32:28] Starting 'default'...
[15:32:28] Starting 'build'...   
[15:32:28] Starting 'compress'...
[15:32:28] Starting 'clean'...   
[15:32:28] Finished 'clean' after 23 ms
[15:32:28] Starting '<anonymous>'...   
[15:32:29] Finished '<anonymous>' after 127 ms
[15:32:29] Finished 'compress' after 157 ms
[15:32:29] Finished 'build' after 165 ms
[15:32:29] Starting '<anonymous>'...
[15:32:29] '<anonymous>' errored after 3.01 ms
[15:32:29] Error: watching ./src/**/***: watch task has to be a function (optionally generated by 
using gulp.parallel or gulp.series)
at Gulp.watch (C:\Users\Gayatree\test-widget\node_modules\gulp\index.js:31:11)        
at C:\Users\Gayatree\test-widget\gulpfile.js:47:14
at bound (domain.js:419:14)
at runBound (domain.js:432:12)
at asyncRunner (C:\Users\Gayatree\test-widget\node_modules\async-done\index.js:55:18) 
at processTicksAndRejections (internal/process/task_queues.js:76:11)
[15:32:29] 'default' errored after 377 ms
PS C:\Users\Gayatree\test-widget>

[我在某些网站上看到它说要更改watch功能的书写格式，我也曾尝试过，但是没有用。显示错误的页面如下。

var gulp = require("gulp"),
zip = require("gulp-zip"),
del = require("del"),
newer = require("gulp-newer"),
log = require('fancy-log'),
colors = require('ansi-colors'), 
plumber = require("gulp-plumber"),
gulpif = require("gulp-if"),
jsonTransform = require("gulp-json-transform"),
intercept = require("gulp-intercept"),
argv = require("yargs").argv,
widgetBuilderHelper = require("widgetbuilder-gulp-helper"),
jsValidate = require("gulp-jsvalidate");

var pkg = require("./package.json"),
paths = widgetBuilderHelper.generatePaths(pkg),
xmlversion = widgetBuilderHelper.xmlversion;

gulp.task("clean", function () {
    return del([
        paths.WIDGET_TEST_DEST,
        paths.WIDGET_DIST_DEST
    ], { force: true });
});

gulp.task("compress", gulp.series(["clean"], function () {
    return gulp.src("src/**/*")
        .pipe(zip(pkg.name + ".mpk"))
        .pipe(gulp.dest(paths.TEST_WIDGETS_FOLDER))
        .pipe(gulp.dest("dist"));
}));

gulp.task("build", gulp.series(["compress"]));

gulp.task("default", gulp.series(['build'], function() {
    gulp.watch("./src/**/*", ["compress"]);
    gulp.watch("./src/**/*.js", ["copy:js"]);
    gulp.watch("./src/**/*.html", ["copy:html"])
}));

gulp.task("compress", gulp.series(["clean"], function () {
    return gulp.src("src/**/*")
        .pipe(zip(pkg.name + ".mpk"))
        .pipe(gulp.dest(paths.TEST_WIDGETS_FOLDER))
        .pipe(gulp.dest("dist"));
}));

gulp.task("copy:js", function () {
    return gulp.src(["./src/**/*.js"])
        .pipe(plumber(function (error) {
            var msg = colors.red("Error");
            if (error.fileName) {
                msg += colors.red(" in ") + colors.cyan(error.fileName);
            }
            msg += " : " + colors.cyan(error.message);
            log(msg);
            this.emit("end");
        }))
        .pipe(jsValidate())
        .pipe(newer(paths.TEST_WIDGETS_DEPLOYMENT_FOLDER))
        .pipe(gulp.dest(paths.TEST_WIDGETS_DEPLOYMENT_FOLDER));
});

gulp.task("copy:html", function () {
    return gulp.src(["./src/**/*.html"])
        .pipe(newer(paths.TEST_WIDGETS_DEPLOYMENT_FOLDER))
        .pipe(gulp.dest(paths.TEST_WIDGETS_DEPLOYMENT_FOLDER));
});

gulp.task("version:xml", function () {
    return gulp.src(paths.PACKAGE_XML)
        .pipe(xmlversion(argv.n))
        .pipe(gulp.dest("./src/"));
});

gulp.task("version:json", function () {
    return gulp.src("./package.json")
        .pipe(gulpif(typeof argv.n !== "undefined", jsonTransform(function(data) {
            data.version = argv.n;
            return data;
        }, 2)))
        .pipe(gulp.dest("./"));
});

gulp.task("icon", function (cb) {
    var icon = (typeof argv.file !== "undefined") ? argv.file : "./icon.png";
    console.log("\nUsing this file to create a base64 string: " + colors.cyan(icon));
    gulp.src(icon)
        .pipe(intercept(function (file) {
            console.log("\nCopy the following to your " + pkg.name + ".xml (after description):\n\n" + colors.cyan("<icon>") + file.contents.toString("base64") + colors.cyan("<\/icon>") + "\n");
            cb();
        }));
});

gulp.task("folders", function () {
    paths.showPaths(); return;
});

gulp.task("modeler", function (cb) {
    widgetBuilderHelper.runmodeler(MODELER_PATH, MODELER_ARGS, paths.TEST_PATH, cb);
});

gulp.task("version", gulp.parallel(["version:xml", "version:json"]));

有人可以帮助我调试此代码吗？我已经检查了代码，但不知道问题出在哪里。

Answer 1

您有many行代码如下：

gulp.parallel(["version:xml", "version:json"])

和

gulp.task("compress", gulp.series(["clean"], function () {

将它们全部更改为以下形式：

gulp.parallel("version:xml", "version:json")

和

gulp.task("compress", gulp.series("clean", function () {

series和parallel不将数组作为参数。参见https://gulpjs.com/docs/en/api/series#parameters

也更改这些，从

gulp.watch("./src/**/*", ["compress"]);
  gulp.watch("./src/**/*.js", ["copy:js"]);
  gulp.watch("./src/**/*.html", ["copy:html"])
  gulp.watch("./src/**/*.html", ["copy:html"])

to

gulp.watch("./src/**/*", gulp.series("compress"));
  gulp.watch("./src/**/*.js", gulp.series("copy:js"));
  gulp.watch("./src/**/*.html", gulp.series("copy:html"))
  gulp.watch("./src/**/*.html", gulp.series("copy:html"))