gulp-memory-cache

A gulp plugin for caching files in memory with incremental build helpers.

It is aimed to be used with Gulp 4, see why: Building with Gulp 4: Incremental builds.

If you are using Gulp 3, you will need to use gulp-memory-cache in combination with gulp-cached or similar. However be aware that both modules will maintain their own cache and therefore files are cached twice.

Usage

var gulp   = require('gulp');
var jshint = require('gulp-jshint');
var concat = require('gulp-concat');
var cache  = require('gulp-memory-cache');
 
gulp.task('buildJs', function () {
    return gulp.src('src/**/*.js', {since: cache.lastMtime('js')})
        .pipe(jshint())
        .pipe(cache('js'))
        .pipe(concat('app.js'))
        .pipe(dest('build'));
});
 
gulp.task('watch', function () {
    gulp.watch('src/**/*.js', gulp.series('buildJs'))
        .on('change', cache.update('js'));
});
 
gulp.task('build', gulp.series('buildJs', 'watch'));

API

cache(name, save)

• name (required): the cache name
• save (optional, default to true): whether or not to save / update cache

If save is truthy, it will save (update) streamed files to cache with name name. cache() then returns a stream containing all files in cache in the order they were added.

cache.save(name)

• name (required): the cache name

Saves streamed files to cache with name name. Useful if you want to save in a pipeline for retrieving later (in the same or another pipeline).

cache.flush(name)

• name (required): the cache name

Flush (remove all files) cache name. Handy to force a stream to process again all its files.

cache.forget(name, filePath[, fn])

• name (required): the cache name
• filePath (required): the file path
• fn: a file path transformation function

Remove from cache name file with path filePath. fn is a file path transformation function (see below for an example with cache.update().

cache.update(name[, fn])

• name (required): the cache name
• fn: a file path transformation function

To use in watch.on('change', ...) in order to avoid boilerplate code. It will automatically remove files which have been deleted from cache name. fn is a function to transform a file path and can be useful for removing a file from cache which name has been altered by a gulp plugin.

gulp.watch('src/**/*.tpl.html', gulp.series('bundlePartials'))
    .on('change', cache.update('partials', function (filePath) {
        return filePath.replace(/.html$/, '.js')
    }));

cache.lastMtime(name)

• name (required): the cache name

Returns the most recent mtime (modified time) of all files in specified cache, can be used in lieu of gulp.lastRun().

cache.lastUpdated(name)

• name (required): the cache name

Returns the last time a cache was updated, can also be used in lieu of gulp.lastRun().

cache.get(name)

• name (optional): the cache name

Return cache named name, or all cached data if name is not supplied.

Cache API

cache.get(cacheName) returns a Cache object.