Depends on path you given at gulp.dest('...'); if folder not created by ng build then gulp will auto create the folder at specific path including converted images and if folder already present like you said then it will replace those images with current ( converted ) images.
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Depends on path you given at gulp.dest('...'); if folder not created by ng build then gulp will auto create the folder at specific path including converted images and if folder already present like you said then it will replace those images with current ( converted ) images.