Question

我正在使用google-closure-compiler和gulp-watch来编译js文件，只要它们中的任何一个被更改。

这是代码;

var closureCompiler = require('google-closure-compiler').gulp();
var flatmap = require('gulp-flatmap');    
var watch = require('gulp-watch');

gulp.task('js-closure', function () {
    return watch(['app/js/*.js', 'dist/single.js'], function()
    {
        gulp.src(['app/js/*.js', 'dist/single.js'], {base: './'})
            .pipe(flatmap(function(stream, file) {
                return stream.pipe(closureCompiler({
                    compilation_level: 'SIMPLE_OPTIMIZATIONS',
                    warning_level: 'QUIET',
                    language_in: 'ECMASCRIPT6_STRICT',
                    language_out: 'ECMASCRIPT5_STRICT',
                    output_wrapper: '(function(){\n%output%\n}).call(this)',
                    js_output_file: path.basename(file.path).replace(/js$/, 'min.js')
                }))
            }))
            .pipe(gulp.dest('./dist/js'));
    });
});

工作正常。但是，当检测到js文件已更改并重新编译时，我想将新消息打印到终端。新消息应该提供这样的信息;

1201hrs - file XXX was changed and recompiled

任何形式的伐木都会受到欢迎。

Answer 1

使用gulp-changed-in-place，它只传递已更改的源文件。 gulp-logger是基本的流记录器。

var gulp = require("gulp"),
    changedInPlace = require("gulp-changed-in-place"),
    logger = require("gulp-logger");

gulp.task("default", function () {
  return gulp.src("app/js/**/*.js")
    .pipe(changedInPlace())
    // the pipe now contains the files
    // that have changed since the last run
    .pipe(logger({
      before: "Closure compiler task",
      after: "Compiling complete!",
      showChange: true
    }))
    // your own gulp task goes here


    // then pipe to the destination
    .pipe(gulp.dest("./dist/js"));
});

Answer 2

以下是问题中提供的源代码所需的修改。感谢Dan Nagle，他提供了使用gulp-changed-in-place和gulp-logger的提示。

var closureCompiler = require('google-closure-compiler').gulp();
var flatmap = require('gulp-flatmap');
var watch = require('gulp-watch');
var changedInPlace = require("gulp-changed-in-place");
var logger = require("gulp-logger");

gulp.task('js-closure', function () {
    return watch(['app/js/*.js', 'dist/single.js'], function()
    {
        gulp.src(['app/js/*.js', 'dist/single.js'], {base: './'})
            .pipe(changedInPlace())
            .pipe(flatmap(function(stream, file) {
                return stream.pipe(closureCompiler({
                    compilation_level: 'SIMPLE_OPTIMIZATIONS',
                    warning_level: 'QUIET',
                    language_in: 'ECMASCRIPT6_STRICT',
                    language_out: 'ECMASCRIPT5_STRICT',
                    output_wrapper: '(function(){\n%output%\n}).call(this)',
                    js_output_file: path.basename(file.path).replace(/js$/, 'min.js')
                }))
            }))
            .pipe(logger({
                before: "file was changed",
                after: "file has been recompiled",
                showChange: true
            }))
            .pipe(gulp.dest('./dist/js'));
    });
});

gulp-watch检测到文件更改时打印新邮件

2 个答案: