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Showing content from https://github.com/sindresorhus/gulp-changed below:

sindresorhus/gulp-changed: Only pass through changed files

Only pass through changed files

No more wasting precious time on processing unchanged files.

By default it's only able to detect whether files in the stream changed. If you require something more advanced like knowing if imports/dependencies changed, create a custom comparator, or use another plugin.

npm install --save-dev gulp-changed

import gulp from 'gulp';
import changed from 'gulp-changed';
import ngAnnotate from 'gulp-ng-annotate'; // Just as an example

const SOURCE = 'src/*.js';
const DESTINATION = 'dist';

exports.default = () => (
	gulp.src(SOURCE)
		.pipe(changed(DESTINATION))
		// `ngAnnotate` will only get the files that
		// changed since the last time it was run
		.pipe(ngAnnotate())
		.pipe(gulp.dest(DESTINATION))
);

Type: string | Function

Destination directory. Same as you put into gulp.dest().

This is needed to be able to compare the current files with the destination files.

Can also be a function returning a destination directory path.

Type: object

Type: string
Default: process.cwd()

Working directory the folder is relative to.

Type: string

Extension of the destination files.

Useful if it differs from the original, like in the example below:

export const jade = () => (
	gulp.src('src/**/*.jade')
		.pipe(changed('app', {extension: '.html'}))
		.pipe(jade())
		.pipe(gulp.dest('app'))
);

Type: Function
Default: compareLastModifiedTime

Function that determines whether the source file is different from the destination file.

Named imports:

• compareLastModifiedTime
• compareContents

import {compareContents} from 'gulp-changed';

export const jade = () => (
	gulp.src('src/**/*.jade')
		.pipe(changed('app', {hasChanged: compareContents}))
		.pipe(jade())
		.pipe(gulp.dest('app'))
);

You can also specify a custom comparator function, which will receive the following arguments:

• sourceFile (Vinyl file object)
• destinationPath (string) - The destination for sourceFile as an absolute path

The function is expected to return sourceFile | Promise<sourceFile> if it passes some comparison or undefined | Promise<undefined>. Examples.

Type: Function

Function to transform the path to the destination file. Should return the absolute path to the (renamed) destination file.

Useful if you rename your file later on, like in the below example:

export const marked = () => (
	gulp.src('src/content/about.md')
		.pipe(changed('dist', {
			transformPath: newPath => path.join(path.dirname(newPath), path.basename(newPath, '.md'), 'index.html')
		}))
		.pipe(marked())
		.pipe(rename(newPath => path.join(path.dirname(newPath), path.basename(newPath, '.md'), 'index.html')))
		.pipe(gulp.dest('dist'))
);

If you're looking to process source files in-place without any build output (formatting, linting, etc), have a look at gulp-changed-in-place.

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