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Issue with Spread Operator Inside JSON #1927

FlameWolf opened this Issue Apr 13, 2018 · 3 comments


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4 participants

FlameWolf commented Apr 13, 2018

When trying to parse a JSON expression containing a spread operator, we get an error, even though the code is valid.

Steps to reproduce

Try to validate the below code:

var x = {
	a: "asdf",
	b: "qwerty",
	...(1 > 0 ? { c: "zxcv" } : ""),
	d: 1234

Expected output

A message saying "Code is syntactically valid."

Actual output

Error: Line 4: Unexpected token ...


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dbryan0516 commented Aug 13, 2018

Closed #1949 and moved here

Steps to reproduce

When using recast to parse, it fails on a spread syntax object.

query = {
      ...query, // FAILS here, line 477
      $or: [
        {_id: { $in: req.jwt.var}},
        {owner: req.jwt.var2}

Expected output

Program completes parsing normally.

Actual output

                throw this.unexpectedTokenError(token, message);
Error: Line 477: Unexpected token ...
    at ErrorHandler.constructError (gitdir\node_modules\esprima\dist\esprima.js:5012:22)
    at ErrorHandler.createError (gitdir\node_modules\esprima\dist\esprima.js:5028:27)
    at Parser.unexpectedTokenError (gitdir\node_modules\esprima\dist\esprima.js:1985:39)
    at Parser.throwUnexpectedToken (gitdir\node_modules\esprima\dist\esprima.js:1995:21)
    at Parser.parseObjectPropertyKey (gitdir\node_modules\esprima\dist\esprima.js:2499:33)
    at Parser.parseObjectProperty (gitdir\node_modules\esprima\dist\esprima.js:2534:25)
    at Parser.parseObjectInitializer (gitdir\node_modules\esprima\dist\esprima.js:2602:35)
    at Parser.inheritCoverGrammar (gitdir\node_modules\esprima\dist\esprima.js:2285:37)
    at Parser.parsePrimaryExpression (gitdir\node_modules\esprima\dist\esprima.js:2354:38)
    at Parser.inheritCoverGrammar (gitdir\node_modules\esprima\dist\esprima.js:2285:37)

Commenting out that line (477), and it ran successfully


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AlekseyChepurko commented Sep 24, 2018

Hi there ! Is there any chance this to be fixed ?:) according to the test/fixtures/es2018/spread-property it should work but does not for me


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dorellang commented Nov 5, 2018

Apparently this feature is supported in master, but not in the latest official release. It would be great it were on the official release too. I am writing a JavaScript visualization platform and some projects fail because of this :S

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