Empty minified output when input is a single plain string

[JeanSamGirard]

I'm using uglifyjs to minify user code transpiled in javascript by another algorythm that produces javascript expressions.

Everything works until the generated javascript is a plain string with no other operations.

Trying to minify a plain string result in an empty string output.

Uglify version (3.15.1)

JavaScript input : "my string"

minify(js, { mangle: false, compress: { expression: true } })

Output : ""

Expected Output : "my string"

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My current workaround is injecting + "" before minifying generated javascript when the output is a plain string

[alexlamsl]

Thanks for the detailed report.

Confirmed as a regression since uglify-js@3.4.3 caused by 76df77c − investigating.

[alexlamsl]

Fix released in uglify-js@3.15.2