Added type annotation for fragmentDefinition

Author: Dan Stenmark

packages/apollo-codegen-swift/src/__tests__/__snapshots__/codeGeneration.ts.snap

@@ -916,7 +916,7 @@ exports[`Swift code generation #initializerDeclarationForProperties() should gen
 exports[`Swift code generation #structDeclarationForFragment() should generate a struct declaration for a fragment that includes a fragment spread 1`] = `
 "public struct HeroDetails: GraphQLFragment {
   /// The raw GraphQL definition of this fragment.
-  public static let fragmentDefinition =
+  public static let fragmentDefinition: String =
     \\"\\"\\"
     fragment HeroDetails on Character {
       name
@@ -996,7 +996,7 @@ exports[`Swift code generation #structDeclarationForFragment() should generate a
 exports[`Swift code generation #structDeclarationForFragment() should generate a struct declaration for a fragment with a concrete type condition 1`] = `
 "public struct DroidDetails: GraphQLFragment {
   /// The raw GraphQL definition of this fragment.
-  public static let fragmentDefinition =
+  public static let fragmentDefinition: String =
     \\"\\"\\"
     fragment DroidDetails on Droid {
       name
@@ -1046,7 +1046,7 @@ exports[`Swift code generation #structDeclarationForFragment() should generate a
 exports[`Swift code generation #structDeclarationForFragment() should generate a struct declaration for a fragment with a subselection 1`] = `
 "public struct HeroDetails: GraphQLFragment {
   /// The raw GraphQL definition of this fragment.
-  public static let fragmentDefinition =
+  public static let fragmentDefinition: String =
     \\"\\"\\"
     fragment HeroDetails on Character {
       name
@@ -1134,7 +1134,7 @@ exports[`Swift code generation #structDeclarationForFragment() should generate a
 exports[`Swift code generation #structDeclarationForFragment() should generate a struct declaration for a fragment with an abstract type condition 1`] = `
 "public struct HeroDetails: GraphQLFragment {
   /// The raw GraphQL definition of this fragment.
-  public static let fragmentDefinition =
+  public static let fragmentDefinition: String =
     \\"\\"\\"
     fragment HeroDetails on Character {
       name

packages/apollo-codegen-swift/src/codeGeneration.ts

@@ -346,7 +346,9 @@ export class SwiftAPIGenerator extends SwiftGenerator<CompilerContext> {
       () => {
         if (source) {
           this.comment("The raw GraphQL definition of this fragment.");
-          this.printOnNewline(swift`public static let fragmentDefinition =`);
+          this.printOnNewline(
+            swift`public static let fragmentDefinition: String =`
+          );
           this.withIndent(() => {
             this.multilineString(source, suppressMultilineStringLiterals);
           });