[blink-dev: FYI]
Lexical declarations ('let' and 'const') are part of ES6. The spec for them
in Editor's draft is stable.
The are available in IE11 [1]. Firefox plans to ship them in 35 (Jan 2015)
[2].
Lexical declarations has been available in V8 under --harmony-scoping flag
for quite some time.
Our current implementation is up-to-date with the latest ES6 spec.
To mitigate possible web-incompatibility, in particular conflicts with
legacy 'const' declarations, we are limiting support for lexical
declarations to strict mode code for now. (Sloppy mode support for lexical
declarations will be done as a distinct language feature process-wise).
Owners: [email protected], [email protected]
[1] https://status.modern.ie/blockbindingsletconstfunction
[2] https://developer.mozilla.org/en-US/Firefox/Releases/35
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