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This issue is required to integrate shift inside any editor, because editor needs to maintain a valid AST even if editor content doesn't contain valid content (when editor user is typing some content and open completion for instance)
acorn/esprima provides this feature (loose parser), and can be used in any editor. tern which uses acorn is a sample http://ternjs.net/doc/demo/
IMHO, If you can provide loose parser, a lot of IDE could use shift.