Uncompress tgs files in your gulp build pipeline
$ npm install --save-dev gulp-tgs
const gulp = require('gulp')
const gunzip = require('gulp-gunzip')
const rename = require('gulp-rename')
gulp.task("lottie", function () {
return gulp.src("./tgs/*.tgs")
.pipe(gunzip())
.pipe(rename(function (path) {
path.extname = ".json";
}))
.pipe(gulp.dest("./lottie"));
});