Feature Request: Declare variables as immutable

[michaelmesser]

Immutable would make a properties on an object immutable recursively.
Example:

immutable const a = ["1", "2", "3"]
a.push("4") // Error function mutates immutable variable

The would be useful with pure functions #7770

[RyanCavanaugh]

This is close enough to what's in #6532 that I don't think we would do a new feature for it.

[michaelmesser]

How do I declare a variable as readonly? The issue you linked to was taking about making a property readonly. There was a comment mentioning readonly variables but that was not implemented.

On Apr 5, 2016, at 6:20 PM, Mohamed Hegazy notifications@github.com wrote:

Closed #7796 #7796.

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[lastmjs]

Yes, what about a variable that is just a variable, not part of an interface? Do we have any solution for checking the immutability of one-off variables?