Fix #4491: import- and export-specific lexing should stop#4492
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GeoffreyBooth merged 3 commits intojashkenas:masterfrom Apr 9, 2017
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GeoffreyBooth
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Apr 8, 2017
| @seenImport = no # Used to recognize IMPORT FROM? AS? tokens. | ||
| @seenExport = no # Used to recognize EXPORT FROM? AS? tokens. | ||
| @exportSpecifierList = no # Used to identify when in an EXPORT {...} FROM? ... | ||
| @importSpecifierList = no # Used to identify when in an IMPORT {...} FROM? ... |
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Please keep it consistent and always put the import stuff before the export stuff.
src/lexer.coffee
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| @exportSpecifierList = yes | ||
| else if @exportSpecifierList and value is '}' | ||
| @exportSpecifierList = no | ||
| else if value is '{' and @seenImport |
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@GeoffreyBooth ok put imports first Also updated previously merged (via #4490) fix for #4489 to follow style guide and use camelCase |
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Thanks. Looks good to me, @lydell? |
GeoffreyBooth
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Apr 8, 2017
vendethiel
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Apr 8, 2017
| if value is '{' and prev?[0] is 'EXPORT' | ||
| if value is '{' and @seenImport | ||
| @importSpecifierList = yes | ||
| else if @importSpecifierList and value is '}' |
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this doesn't handle nested objects, right?
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@vendethiel right, I didn't see any cases in the documentation or tests where an import could contain nested-object syntax?
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@vendethiel the “destructuring” in ES2015 import statements is just a similar-looking syntax:
import { a: b } from 'lib'repl: ES2015 named imports do not destructure. Use another statement for destructuring after the import. (1:12)
> 1 | import { a: b } from 'lib'
| ^
This was referenced Apr 9, 2017
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Nov 12, 2025
…ashkenas#4492) * Fix jashkenas#4491: import- and export-specific lexing should stop * split up tests * fixes from code review
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Fixes #4491 (I think)
I'm not really familiar with the
import/exportsyntax but it looks like the only the time that the import-/export-specific lexing controlled by@seenImport/@seenExport(which lexesas,from,defaultdifferently) needs to continue beyond a line break is if we're inside a{...}specifier list. So I added an@importSpecifierList(corresponding to the existing@exportSpecifierList), and unless one of these is set (indicating we're inside a specifier list) then seeing alineToken()clears@seenImportand@seenExportNot sure if I should add additional tests for any of the other various
import/exportsyntaxes?