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+---
+status: proposed
+flip: 277
+authors: Supun Setunga (supun.setunga@dapperlabs.com)
+sponsor: Supun Setunga (supun.setunga@dapperlabs.com)
+updated: 2024-06-11
+---
+
+# FLIP 134: Import contracts as references
+
+## Objective
+
+Change the import statement semantics to import a reference to the contract, instead of importing the concrete value.
+Thus, accessing the fields of a contract externally would return references to fields, preventing any unintended external mutations.
+
+## Motivation
+
+In the [external mutability FLIP](https://github.com/onflow/flips/pull/89), the behaviour for accessing fields of a
+composite value was changed, to prevent external-mutation foot gun.
+You can read more about the overall vision [here](https://github.com/onflow/flips/blob/main/cadence/vision/mutability-restrictions.md).
+The essence of the change is that, if someone owns the composite value, they would have the full access (read/write/mutate) to its fields.
+Otherwise, if someone only got a reference to the composite value, then they can access the fields also as references,
+and the entitlements would kick-in to limit what they can do with those fields.
+
+Unfortunately, one edge-case we didn't realize at the time is that, contracts only have one value per network (it's a shared state),
+and by importing a contract, one could get the full access to that contract value.
+The imported contract value behaves like a reference, but is not represented using a reference in the language semantics. 
+Because of that, if the contract had an array/dictionary/composite -typed field defined as read-only (i.e: `access(all)`),
+then anyone could modify the content of that field, such as inserting/removing elements, etc.
+
+```cadence
+access(all) contract Foo {
+    access(all) var array : [Int] // Can't set a new value to the array, but can "update" the content (insert/remove/etc) 
+}
+```
+
+Here, the author of the contract may have intended it to be "read-only", however, it is not truly read only.
+
+```cadence
+import Foo from 0x1
+
+access(all) fun main() {
+    Foo.array[0] = 3
+    Foo.array.append(42)
+    Foo.array.remove(at: 0)
+}
+```
+
+This is exactly the type of foot-gun we tried to prevent using the external mutability improvements ([FLIP 89](https://github.com/onflow/flips/pull/89)).
+But unfortunately, given the contract import results in a non-reference value, the suggested changes in that FLIP
+does not get apply here.
+
+## User Benefit
+
+Prevent the foot-gun of unintended external mutations to read-only contracts fields.
+
+## Design Proposal
+
+The proposal is to change the import semantics to import contracts as a reference, instead of the concrete value.
+
+```cadence
+import Foo from 0x1
+
+access(all) fun main() {
+    var foo: &Foo = Foo  // The type of the imported contract value `Foo` will be `&Foo`
+}
+```
+
+Then, accessing a container typed field will also result in a reference (because of the changes added in [FLIP 89](https://github.com/onflow/flips/pull/89)),
+limiting the operation that can be performed on them.
+For example, mutating the `Foo.array` would result in an error.
+
+```cadence
+import Foo from 0x1
+
+access(all) fun main() {
+    var array: &[Int] = Foo.array  // Accessing field would also return a reference.
+
+    // All of the below operation would be statically rejected,
+    // since `Foo.array` would be an unauithorized reference.
+    Foo.array[0] = 3
+    Foo.array.append(42)
+    Foo.array.remove(at: 0)
+}
+```
+
+One thing to note is that, this proposal would not change the way the contract value is accessed within the contract itself.
+
+```cadence
+contract Foo {
+    access(all) array: [Int]
+
+    init() {
+        self.array = []
+    }
+    
+    access(all) fun bar() {
+        // Accessing the contract within itself would return the concrete value, not a reference.
+        
+        var foo: Foo = Foo  // Type the contract value is `Foo` (not `&Foo)`)
+        
+        var array: [Int] = Foo.array  // Accessing field would also return a copy of the concrete value.
+        
+        // Modifying fields within the contract is allowed.
+        Foo.array[0] = 3
+        Foo.array.append(42)
+        Foo.array.remove(at: 0)
+    }
+}            
+```
+### Drawbacks
+
+This is a breaking change. Certain users may have to update their code.
+
+### Alternatives Considered
+
+A non-breaking alternative solution is to keep current language semantics as-is, and warn about contract fields that
+has `access(all)` access-modifier, through a tooling like the linter.
+However, this doesn't guarantee the foot-gun would be fixed.
+
+### Performance Implications
+
+None
+
+### Dependencies
+
+None
+
+### Engineering Impact
+
+This change is trivial in the implementation.
+
+A draft implementation can be found at: https://github.com/onflow/cadence/pull/3417
+
+### Compatibility
+
+This is a breaking change.
+
+### User Impact
+
+This would impact the Cadence 1.0 staged contracts. I ran an analyzer for the updated core contracts and the
+staged-contracts, and as of 12th June 2024, only three (3) contracts out of 456 are impacted by this change.
+The changes needed for those contracts are fairly simple, and would only require changing a couple of lines of code.
+
+## Related Issues
+
+None
+
+## Prior Art
+
+None
+
+## Questions and Discussion Topics
+
+None
+