gulpfile.js

const gulp = require("gulp");
const zip = require("gulp-zip");
const fs = require("fs");
const babel = require("gulp-babel");
const sourcemaps = require("gulp-sourcemaps");
const manifest = require("./src/manifest.json");
const replace = require('gulp-replace');
const concat = require('gulp-concat');
gulp.task("clean", (cb) => {
  fs.rmSync("dist", { recursive: true, force: true });
  cb();
});

gulp.task("firefox-copy", () => {
  return gulp.src(["src/**/**"]).pipe(gulp.dest("dist/firefox"));
});

gulp.task("firefox-babel", () => {
  return gulp
    .src(["dist/firefox/background/*.js"])
    .pipe(sourcemaps.init())
    .pipe(
      babel({
        presets: ["@babel/preset-env"],
      })
    )
    .pipe(sourcemaps.write())
    .pipe(gulp.dest("dist/firefox/background"));
});

gulp.task("firefox-zip", () => {
  return gulp
    .src(["dist/firefox/**/*"])
    .pipe(zip("firefox.zip"))
    .pipe(gulp.dest("dist"));
});

gulp.task("chrome-copy", () => {
  return gulp.src(["src/**/**"]).pipe(gulp.dest("dist/chrome"));
});

gulp.task("chrome-rename", (cb) => {
  fs.renameSync(
    "dist/chrome/manifest.json",
    "dist/chrome/firefox_manifest.json"
  );
  fs.renameSync(
    "dist/chrome/chrome_manifest.json",
    "dist/chrome/manifest.json"
  );
  cb();
});

gulp.task("chrome-babel", () => {
  return gulp
    .src(["dist/chrome/background/*.js"])
    .pipe(sourcemaps.init())
    .pipe(
      babel({
        presets: ["@babel/preset-env"],
      })
    )
    .pipe(sourcemaps.write())
    .pipe(gulp.dest("dist/chrome/background"));
});

gulp.task("chrome-concat-background",()=>{
  return gulp.src(["/lib/languages.js", "/lib/config.js", "/lib/platformInfo.js","/lib/util.js", "/background/translationCache.js", "/background/translationService.js", "/background/chrome_background.js"].map(item=>"dist/chrome"+item))
  .pipe(concat('background-entry.js'))
  .pipe(gulp.dest('dist/chrome/background'));
})

gulp.task("chrome-zip", () => {
  return gulp
    .src(["dist/chrome/**/**"])
    .pipe(zip("chrome.zip"))
    .pipe(gulp.dest("dist"));
});

gulp.task("chrome-replace",()=>{
  return gulp.src(["dist/chrome/**/*.html"])
  .pipe(replace("__IMMERSIVE_TRANSLATE_VERSION__",manifest.version))
  .pipe(gulp.dest("dist/chrome/"));
})

gulp.task("firefox-replace",()=>{
  return gulp.src(["dist/firefox/**/*.html"])
  .pipe(replace("__IMMERSIVE_TRANSLATE_VERSION__",manifest.version))
  .pipe(gulp.dest("dist/firefox"));
})
gulp.task(
  "firefox-build",
  gulp.series("firefox-copy", "firefox-babel", "firefox-replace","firefox-zip")
);
gulp.task(
  "chrome-build",
  gulp.series("chrome-copy", "chrome-rename", "chrome-babel", "chrome-replace","chrome-concat-background","chrome-zip")
);

gulp.task("default", gulp.series("clean", "firefox-build", "chrome-build"));