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Description
Uglify version (uglifyjs -V)
3.19.3
JavaScript input
Dygraphs 2.2.1
The uglifyjs CLI command executed or minify() options used.
uglifyjs --compress --mangle --output-opts 'preamble='\''/*! @license https://github.com/danvk/dygraphs/blob/v2.2.1/LICENSE.txt (MIT) */'\' --source-map 'content='\''dygraph.min.tmp.js.map'\'',includeSources=true,url='\''dygraph.min.js.map'\' -o dygraph.min.js dygraph.min.tmp.js
JavaScript output or error produced.
2025-01-10T20:46:43.6114772Z > ./scripts/run-tests.sh min
2025-01-10T20:46:43.6114926Z
2025-01-10T20:46:44.8011713Z (node:4096) [DEP0066] DeprecationWarning: OutgoingMessage.prototype._headers is deprecated
2025-01-10T20:46:44.8012354Z (Use `node --trace-deprecation ...` to show where the warning was created)
2025-01-10T20:46:44.8496307Z SyntaxError: Parse error
This is because the tests run in PhantomJS, which is ES5 only (and the output is supposed to be usable in ES5-only browsers as well).
The actual problem is (diffing between a working output from an older uglifyjs version and the newer one):
[…] "dygraphs/src/dygraph-canvas.js":[function(t,e,a){[-"use strict";-]Object.defineProperty(a,"__esModule",{value:!0}),a.default=void 0;var T=[-function-]{+(+}(t,e){+=>+}{if(!e&&t&&t.__esModule)return t; […]
So it’s removing the “use strict” and changing a function to an arrow function. This is a hard bug, a regression and a showstopper.
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