Question 1

How to use gulp-if to conditionally minify based on environment variables?

Accepted Answer

Set a boolean condition from environment variables, e.g., `var condition = process.env.NODE_ENV === 'production';`, then pipe to uglify only when true, as shown in the basic usage example where all files still flow downstream.

Question 2

gulp-if vs gulp-ignore: which one should I use?

Accepted Answer

gulp-if is for general conditional routing within streams, supporting ternary logic, while gulp-ignore is specifically for excluding files from the stream. They can be combined; gulp-if integrates with gulp-ignore for more precise control, as demonstrated in the 'Remove from here on' example.

Question 3

Can gulp-if handle async conditions?

Accepted Answer

No, gulp-if conditions must be synchronous functions returning booleans. For async logic, you need to handle it upstream or use other patterns, as gulp-if doesn't natively support promises or callbacks, which can limit dynamic file processing.

Question 4

How to chain multiple conditions with gulp-if?

Accepted Answer

Chain multiple gulp-if calls in sequence or use a complex condition function that evaluates multiple criteria. For instance, define a function checking file extensions and metadata, then pipe accordingly, but this can make pipelines harder to debug.

Question 5

Is gulp-if compatible with Gulp 4?

Accepted Answer

Yes, gulp-if works with Gulp 4 as it relies on vinyl streams, but ensure all plugins in your pipeline are updated for compatibility. The README's Travis CI badge indicates ongoing maintenance, but test thoroughly due to potential plugin issues.

Question 6

How to integrate gulp-if with lazypipe for reusable build steps?

Accepted Answer

Wrap gulp-if in a function when adding to a lazypipe, as shown in the README: `.pipe(function () { return gulpif(condition, uglify()); })`. This ensures proper instantiation but adds complexity compared to static pipe chains.

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