gulp-babel shown Syntax-error on comments

Question

I help on developping a Foss tool , but i have error in gulp on Fedora29. Other dev use debian based system and seems it's OK. It was OK with the previopus version of Fedora

The gulp files are at github and it seems gulp-babel throw SyntaxError on comment :

[15:02:50] SyntaxError in plugin "run-sequence(babelify)"
Message:
    /var/www/master/assets/packages/adminbasics/build/adminbasics.js: Unexpected token (26258:37)
Details:
    pos: 811003
    loc: [object Object]
    _babel: true
    codeFrame:   26256 | 
  26257 |           if (context.method === "throw") {
> 26258 |             // If maybeInvokeDelegate
        |                                      ^
    fileName: /var/www/master/assets/packages/adminbasics/build/adminbasics.js

Here the complete result of gulp default

[adminbasics]$ gulp --no-color default
[15:02:42] Using gulpfile /var/www/master/assets/packages/adminbasics/gulpfile.js
[15:02:42] Starting 'default'...
[15:02:42] Starting 'compile:production'...
[15:02:42] Starting 'sass:production'...
[15:02:42] Starting 'webpack:production'...
[15:02:42] Finished 'sass:production' after 154 ms
[15:02:42] Version: webpack 3.12.0
             Asset     Size  Chunks                    Chunk Names
    adminbasics.js   871 kB       0  [emitted]  [big]  main
adminbasics.js.map  1.12 MB       0  [emitted]         main
[15:02:42] Finished 'webpack:production' after 894 ms
[15:02:42] Starting 'compress'...
[BABEL] Note: The code generator has deoptimised the styling of "/var/www/master/assets/packages/adminbasics/build/adminbasics.js" as it exceeds the max of "500KB".
[15:02:49] Finished 'compress' after 6.85 s
[15:02:49] Starting 'compresslibs'...
[15:02:49] Finished 'compresslibs' after 4.19 ms
[15:02:49] Finished 'compile:production' after 7.75 s
[15:02:49] Starting 'sass'...
[15:02:49] Starting 'webpack'...
[15:02:49] Starting 'babelify'...
[15:02:49] Finished 'sass' after 59 ms
[15:02:50] Version: webpack 3.12.0
             Asset     Size  Chunks                    Chunk Names
    adminbasics.js   871 kB       0  [emitted]  [big]  main
adminbasics.js.map  1.12 MB       0  [emitted]         main
[15:02:50] 'babelify' errored after 889 ms
[15:02:50] SyntaxError in plugin "gulp-babel"
Message:
    /var/www/master/assets/packages/adminbasics/build/adminbasics.js: Unexpected token (26258:37)
[15:02:50] 'default' errored after 8.65 s
[15:02:50] SyntaxError in plugin "run-sequence(babelify)"
Message:
    /var/www/master/assets/packages/adminbasics/build/adminbasics.js: Unexpected token (26258:37)
Details:
    pos: 811003
    loc: [object Object]
    _babel: true
    codeFrame:   26256 | 
  26257 |           if (context.method === "throw") {
> 26258 |             // If maybeInvokeDelegate
        |                                      ^
    fileName: /var/www/master/assets/packages/adminbasics/build/adminbasics.js

Stack:
SyntaxError: /var/www/master/assets/packages/adminbasics/build/adminbasics.js: Unexpected token (26258:37)
  26256 | 
  26257 |           if (context.method === "throw") {
> 26258 |             // If maybeInvokeDelegate
        |                                      ^
    at Parser.pp$5.raise (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:4454:13)
    at Parser.pp.unexpected (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:1761:8)
    at Parser.pp$3.parseExprAtom (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:3750:12)
    at Parser.pp$3.parseExprSubscripts (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:3494:19)
    at Parser.pp$3.parseMaybeUnary (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:3474:19)
    at Parser.pp$3.parseExprOps (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:3404:19)
    at Parser.pp$3.parseMaybeConditional (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:3381:19)
    at Parser.pp$3.parseMaybeAssign (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:3344:19)
    at Parser.pp$3.parseExpression (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:3306:19)
    at Parser.pp$1.parseStatement (/var/www/master/assets/packages/adminbasics/node_modules/babylon/lib/index.js:1906:19)
[15:02:50] Finished 'webpack' after 905 ms

My version

$ gulp -v
[16:09:58] CLI version 2.0.1
[16:09:58] Local version 3.9.1

Thanks if anyone can give advice.