ES6 module-syntax export default errors

[davidtheclark]

When I try a file with ES6 syntax export default function() { .. } I get the following error:

assert.js:86
  throw new assert.AssertionError({
        ^
AssertionError: did not recognize object of type "ExportDefaultDeclaration"
    at Object.getFieldNames (/home/dclark/dev/documentation/node_modules/ast-types/lib/types.js:595:16)
    at visitChildren (/home/dclark/dev/documentation/node_modules/ast-types/lib/path-visitor.js:203:32)
    at Visitor.PVp.visitWithoutReset (/home/dclark/dev/documentation/node_modules/ast-types/lib/path-visitor.js:188:16)
    at NodePath.each (/home/dclark/dev/documentation/node_modules/ast-types/lib/path.js:96:22)
    at visitChildren (/home/dclark/dev/documentation/node_modules/ast-types/lib/path-visitor.js:199:14)
    at Visitor.PVp.visitWithoutReset (/home/dclark/dev/documentation/node_modules/ast-types/lib/path-visitor.js:188:16)
    at visitChildren (/home/dclark/dev/documentation/node_modules/ast-types/lib/path-visitor.js:226:21)
    at Context.traverse (/home/dclark/dev/documentation/node_modules/ast-types/lib/path-visitor.js:343:12)
    at Context.types.visit.visitNode (/home/dclark/dev/documentation/streams/parse.js:130:14)
    at Context.invokeVisitorMethod (/home/dclark/dev/documentation/node_modules/ast-types/lib/path-visitor.js:306:43)

Because Espree-powered ESLint supports this syntax I thought documentation would ... What do you think?

I could try submitting a PR with a failing test if you'd like that.

[tmcw]

This is likely a lack in ast-types rather than espree: benjamn/ast-types#111

[davidtheclark]

Seems like you found the culprit.

[gajus]

benjamn/ast-types#111 issue has been closed, but this remains an issue.

/**
 * Extracts date from a string using provided format.
 * 
 * The supplied format must include 
 * 
 * @param {string} subject
 * @param {string} format
 * @param {string} locale
 * @returns {string} YYYY-MM-DD
 */
export default (subject, format, explicitLocale) => {

};

produces:

curiosity:src gajus$ documentation ./extractDate.js

assert.js:89
  throw new assert.AssertionError({
  ^
AssertionError: did not recognize object of type "ExportDefaultDeclaration"
    at Object.getFieldNames (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/types.js:602:16)
    at visitChildren (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:203:32)
    at Visitor.PVp.visitWithoutReset (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:188:16)
    at NodePath.each (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/path.js:96:22)
    at visitChildren (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:199:14)
    at Visitor.PVp.visitWithoutReset (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:188:16)
    at visitChildren (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:226:21)
    at Context.traverse (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:343:12)
    at Context.types.visit.visitNode (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/streams/parse.js:155:14)
    at Context.invokeVisitorMethod (/Users/gajus/.nvm/versions/node/v4.2.0/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:306:43)

[gajus]

This issue is not present in the master, though.

[kulakowka]

I have the same error.

» documentation

assert.js:89
  throw new assert.AssertionError({
  ^
AssertionError: did not recognize object of type "ExportDefaultDeclaration"
    at Object.getFieldNames (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/types.js:602:16)
    at visitChildren (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:203:32)
    at Visitor.PVp.visitWithoutReset (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:188:16)
    at NodePath.each (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/path.js:96:22)
    at visitChildren (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:199:14)
    at Visitor.PVp.visitWithoutReset (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:188:16)
    at visitChildren (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:226:21)
    at Context.traverse (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:343:12)
    at Context.types.visit.visitNode (/usr/local/lib/node_modules/documentation/streams/parse.js:155:14)
    at Context.invokeVisitorMethod (/usr/local/lib/node_modules/documentation/node_modules/ast-types/lib/path-visitor.js:306:43)

I suspect that it is because such structures

export default (req, res, next) => {
  res.render('homepage/index')
}

Who knows how to solve this problem?