need a option to treat variable defined by var as typed, not dynamic

[DartBot]

This issue was originally filed by @rinick

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people use "var" to define properties because they don't want to type the whole type name like
/Map<String, List<DivElement>>/ var map = getDivMap();
but in most cases I still want the variable to be typed, not dynamic.

there should be an option to make dartEditor and dart2js use a strict mode to check "var" if it's defined with an assignment.

var str = "hello"; // str is String
str = 123; // warning A value of type 'int' cannot be assigned to a variable of type 'String'
var str2; // this is dynamic
str2 = "hello";
str2 = 123; // no problem

[DartBot]

This comment was originally written by @zoechi

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There are already similar requests

• https://code.google.com/p/dart/issues/detail?id=20443
• https://code.google.com/p/dart/issues/detail?id=18269
• https://code.google.com/p/dart/issues/detail?id=15493

maybe also

• https://code.google.com/p/dart/issues/detail?id=19956
• https://code.google.com/p/dart/issues/detail?id=15366
• https://code.google.com/p/dart/issues/detail?id=14600
• https://code.google.com/p/dart/issues/detail?id=13004

see also this discussion

• https://groups.google.com/a/dartlang.org/forum/#!topic/misc/b65ah3sVqiM%5B101-125-false%5D

[dgrove]

Added Area-Analyzer, Triaged labels.

[bwilkerson]

Set owner to @bwilkerson.
Removed Priority-Unassigned label.
Added Priority-Medium, Duplicate labels.
Marked as being merged into #20443.

[clayberg]

Added this to the 1.7 milestone.