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Parsing error when default export involves Array.concat #1941

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jonboiser opened this Issue Jun 15, 2018 · 0 comments

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jonboiser commented Jun 15, 2018

Steps to reproduce

// okay
export default [...foo, ...bar]

// not okay
export default [].concat(foo)
                 ^

The bottom example is how the Buble compiler transforms something like [...foo].

Demo:
http://esprima.org/demo/parse.html?code=%2F%2F%20okay%0Aexport%20default%20%5B...foo%2C%20...bar%5D%0A%0A%2F%2F%20not%20okay%0Aexport%20default%20%5B%5D.concat(foo)

Expected output

Successful parse for the bottom example.

Actual output

Error: Line 5: Unexpected token .

Relevant references

Comparison with acorn on AST Explorer

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