Missing property fix

src/compiler/checker.ts

@@ -83,6 +83,8 @@ namespace ts {
             getSignaturesOfType,
             getIndexTypeOfType,
             getBaseTypes,
+            getBaseTypeOfLiteralType,
+            getWidenedType,
             getTypeFromTypeNode,
             getParameterType: getTypeAtPosition,
             getReturnTypeOfSignature,

src/compiler/diagnosticMessages.json

@@ -3315,6 +3315,14 @@
         "category": "Message",
         "code": 90015
     },
+    "Add declaration for missing property '{0}'": {
+        "category": "Message",
+        "code": 90016
+    },
+    "Add index signature for missing property '{0}'": {
+        "category": "Message",
+        "code": 90017
+    },
     "Octal literal types must use ES2015 syntax. Use the syntax '{0}'.": {
         "category": "Error",
         "code": 8017

src/compiler/types.ts

@@ -2388,6 +2388,8 @@
         getSignaturesOfType(type: Type, kind: SignatureKind): Signature[];
         getIndexTypeOfType(type: Type, kind: IndexKind): Type;
         getBaseTypes(type: InterfaceType): BaseType[];
+        getBaseTypeOfLiteralType(type: Type): Type;
+        getWidenedType(type: Type): Type;
         getReturnTypeOfSignature(signature: Signature): Type;
         /**
          * Gets the type of a parameter at a given position in a signature.

src/harness/fourslash.ts

@@ -2122,15 +2122,15 @@ namespace FourSlash {
          * Because codefixes are only applied on the working file, it is unsafe
          * to apply this more than once (consider a refactoring across files).
          */
-        public verifyRangeAfterCodeFix(expectedText: string, errorCode?: number, includeWhiteSpace?: boolean) {
+        public verifyRangeAfterCodeFix(expectedText: string, includeWhiteSpace?: boolean, errorCode?: number, index?: number) {
             const ranges = this.getRanges();
             if (ranges.length !== 1) {
                 this.raiseError("Exactly one range should be specified in the testfile.");
             }
 
             const fileName = this.activeFile.fileName;
 
-            this.applyCodeFixActions(fileName, this.getCodeFixActions(fileName, errorCode));
+            this.applyCodeAction(fileName, this.getCodeFixActions(fileName, errorCode), index);
 
             const actualText = this.rangeText(ranges[0]);
 
@@ -2155,7 +2155,7 @@ namespace FourSlash {
         public verifyFileAfterCodeFix(expectedContents: string, fileName?: string) {
             fileName = fileName ? fileName : this.activeFile.fileName;
 
-            this.applyCodeFixActions(fileName, this.getCodeFixActions(fileName));
+            this.applyCodeAction(fileName, this.getCodeFixActions(fileName));
 
             const actualContents: string = this.getFileContent(fileName);
             if (this.removeWhitespace(actualContents) !== this.removeWhitespace(expectedContents)) {
@@ -2193,12 +2193,20 @@ namespace FourSlash {
             return actions;
         }
 
-        private applyCodeFixActions(fileName: string, actions: ts.CodeAction[]): void {
-            if (!(actions && actions.length === 1)) {
-                this.raiseError(`Should find exactly one codefix, but ${actions ? actions.length : "none"} found.`);
+        private applyCodeAction(fileName: string, actions: ts.CodeAction[], index?: number): void {
+            if (index === undefined) {
+                if (!(actions && actions.length === 1)) {
+                    this.raiseError(`Should find exactly one codefix, but ${actions ? actions.length : "none"} found.`);
+                }
+                index = 0;
+            }
+            else {
+                if (!(actions && actions.length >= index + 1)) {
+                    this.raiseError(`Should find at least ${index + 1} codefix(es), but ${actions ? actions.length : "none"} found.`);
+                }
             }
 
-            const fileChanges = ts.find(actions[0].changes, change => change.fileName === fileName);
+            const fileChanges = ts.find(actions[index].changes, change => change.fileName === fileName);
             if (!fileChanges) {
                 this.raiseError("The CodeFix found doesn't provide any changes in this file.");
             }
@@ -3535,8 +3543,8 @@ namespace FourSlashInterface {
             this.DocCommentTemplate(/*expectedText*/ undefined, /*expectedOffset*/ undefined, /*empty*/ true);
         }
 
-        public rangeAfterCodeFix(expectedText: string, errorCode?: number, includeWhiteSpace?: boolean): void {
-            this.state.verifyRangeAfterCodeFix(expectedText, errorCode, includeWhiteSpace);
+        public rangeAfterCodeFix(expectedText: string, includeWhiteSpace?: boolean, errorCode?: number, index?: number): void {
+            this.state.verifyRangeAfterCodeFix(expectedText, includeWhiteSpace, errorCode, index);
         }
 
         public importFixAtPosition(expectedTextArray: string[], errorCode?: number): void {

src/services/codefixes/fixAddMissingMember.ts

@@ -0,0 +1,67 @@
+/* @internal */
+namespace ts.codefix {
+    registerCodeFix({
+        errorCodes: [Diagnostics.Property_0_does_not_exist_on_type_1.code],
+        getCodeActions: getActionsForAddMissingMember
+    });
+
+    function getActionsForAddMissingMember(context: CodeFixContext): CodeAction[] | undefined {
+
+        const sourceFile = context.sourceFile;
+        const start = context.span.start;
+        // This is the identifier of the missing property. eg:
+        // this.missing = 1;
+        //      ^^^^^^^
+        const token = getTokenAtPosition(sourceFile, start);
+
+        if (token.kind != SyntaxKind.Identifier) {
+            return undefined;
+        }
+
+        const classDeclaration = getContainingClass(token);
+        if (!classDeclaration) {
+            return undefined;
+        }
+
+        if (!(token.parent && token.parent.kind === SyntaxKind.PropertyAccessExpression)) {
+            return undefined;
+        }
+
+        if ((token.parent as PropertyAccessExpression).expression.kind !== SyntaxKind.ThisKeyword) {
+            return undefined;
+        }
+
+        let typeString = "any";
+
+        if (token.parent.parent.kind === SyntaxKind.BinaryExpression) {
+            const binaryExpression = token.parent.parent as BinaryExpression;
+
+            const checker = context.program.getTypeChecker();
+            const widenedType = checker.getWidenedType(checker.getBaseTypeOfLiteralType(checker.getTypeAtLocation(binaryExpression.right)));
+            typeString = checker.typeToString(widenedType);
+        }
+
+        const startPos = classDeclaration.members.pos;
+
+        return [{
+            description: formatStringFromArgs(getLocaleSpecificMessage(Diagnostics.Add_declaration_for_missing_property_0), [token.getText()]),
+            changes: [{
+                fileName: sourceFile.fileName,
+                textChanges: [{
+                    span: { start: startPos, length: 0 },
+                    newText: `${token.getFullText(sourceFile)}: ${typeString};`
+                }]
+            }]
+        },
+        {
+            description: formatStringFromArgs(getLocaleSpecificMessage(Diagnostics.Add_index_signature_for_missing_property_0), [token.getText()]),
+            changes: [{
+                fileName: sourceFile.fileName,
+                textChanges: [{
+                    span: { start: startPos, length: 0 },
+                    newText: `[name: string]: ${typeString};`
+                }]
+            }]
+        }];
+    }
+}

src/services/codefixes/fixes.ts

@@ -1,4 +1,5 @@
 /// <reference path="fixClassIncorrectlyImplementsInterface.ts" />
+/// <reference path="fixAddMissingMember.ts" />
 /// <reference path="fixClassDoesntImplementInheritedAbstractMember.ts" />
 /// <reference path="fixClassSuperMustPrecedeThisAccess.ts" />
 /// <reference path="fixConstructorForDerivedNeedSuperCall.ts" />

src/services/codefixes/helpers.ts

@@ -32,7 +32,7 @@ namespace ts.codefix {
 
         const declaration = declarations[0] as Declaration;
         const name = declaration.name ? declaration.name.getText() : undefined;
-        const visibility = getVisibilityPrefix(getModifierFlags(declaration));
+        const visibility = getVisibilityPrefixWithSpace(getModifierFlags(declaration));
 
         switch (declaration.kind) {
             case SyntaxKind.GetAccessor:
@@ -58,7 +58,7 @@ namespace ts.codefix {
                 if (declarations.length === 1) {
                     Debug.assert(signatures.length === 1);
                     const sigString = checker.signatureToString(signatures[0], enclosingDeclaration, TypeFormatFlags.SuppressAnyReturnType, SignatureKind.Call);
-                    return `${visibility}${name}${sigString}${getMethodBodyStub(newlineChar)}`;
+                    return getStubbedMethod(visibility, name, sigString, newlineChar);
                 }
 
                 let result = "";
@@ -78,7 +78,7 @@ namespace ts.codefix {
                     bodySig = createBodySignatureWithAnyTypes(signatures, enclosingDeclaration, checker);
                 }
                 const sigString = checker.signatureToString(bodySig, enclosingDeclaration, TypeFormatFlags.SuppressAnyReturnType, SignatureKind.Call);
-                result += `${visibility}${name}${sigString}${getMethodBodyStub(newlineChar)}`;
+                result += getStubbedMethod(visibility, name, sigString, newlineChar);
 
                 return result;
             default:
@@ -138,11 +138,15 @@ namespace ts.codefix {
         }
     }
 
-    function getMethodBodyStub(newLineChar: string) {
-        return ` {${newLineChar}throw new Error('Method not implemented.');${newLineChar}}${newLineChar}`;
+    export function getStubbedMethod(visibility: string, name: string, sigString = "()", newlineChar: string): string {
+        return `${visibility}${name}${sigString}${getMethodBodyStub(newlineChar)}`;
     }
 
-    function getVisibilityPrefix(flags: ModifierFlags): string {
+    function getMethodBodyStub(newlineChar: string) {
+        return ` {${newlineChar}throw new Error('Method not implemented.');${newlineChar}}${newlineChar}`;
+    }
+
+    function getVisibilityPrefixWithSpace(flags: ModifierFlags): string {
         if (flags & ModifierFlags.Public) {
             return "public ";
         }

src/services/tsconfig.json

@@ -78,6 +78,7 @@
         "formatting/smartIndenter.ts",
         "formatting/tokenRange.ts",
         "codeFixProvider.ts",
+        "codefixes/fixAddMissingMember.ts",
         "codefixes/fixExtendsInterfaceBecomesImplements.ts",
         "codefixes/fixClassIncorrectlyImplementsInterface.ts",
         "codefixes/fixClassDoesntImplementInheritedAbstractMember.ts",

tests/cases/fourslash/codeFixUndeclaredClassInstance.ts

@@ -0,0 +1,22 @@
+/// <reference path='fourslash.ts' />
+
+//// class A {
+////     a: number;
+////     b: string;
+////     constructor(public x: any) {}
+//// }
+//// [|class B {
+////     constructor() {
+////         this.x = new A(3);
+////     }
+//// }|]
+
+verify.rangeAfterCodeFix(`
+class B {
+    x: A;
+
+    constructor() {
+        this.x = new A(3);
+    }
+}
+`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);

tests/cases/fourslash/codeFixUndeclaredClassInstanceWithTypeParams.ts

@@ -0,0 +1,22 @@
+/// <reference path='fourslash.ts' />
+
+//// class A<T> {
+////     a: number;
+////     b: string;
+////     constructor(public x: T) {}
+//// }
+//// [|class B {
+////     constructor() {
+////         this.x = new A(3);
+////     }
+//// }|]
+
+verify.rangeAfterCodeFix(`
+class B {
+    x: A<number>;
+
+    constructor() {
+        this.x = new A(3);
+    }
+}
+`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);

tests/cases/fourslash/codeFixUndeclaredIndexSignatureNumericLiteral.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+//// [|class A {
+////     constructor() {
+////         this.x = 10;
+////     }
+//// }|]
+
+verify.rangeAfterCodeFix(`
+class A {
+    [name: string]: number;
+
+    constructor() {
+        this.x = 10;
+    }
+}
+`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 1);

tests/cases/fourslash/codeFixUndeclaredPropertyFunctionEmptyClass.ts

@@ -0,0 +1,20 @@
+/// <reference path='fourslash.ts' />
+
+//// [|class A {
+////     constructor() {
+////         this.x = function(x: number, y?: A){
+////             return x > 0 ? x : y;
+////         }
+////     }
+//// }|]
+
+verify.rangeAfterCodeFix(`
+class A {
+    x: (x: number, y?: A) => A;
+    constructor() {
+        this.x = function(x: number, y?: A){
+            return x > 0 ? x : y;
+        }
+    }
+}
+`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);

tests/cases/fourslash/codeFixUndeclaredPropertyFunctionNonEmptyClass.ts

@@ -0,0 +1,22 @@
+/// <reference path='fourslash.ts' />
+
+//// [|class A {
+////     y: number;
+////     constructor(public a: number) {
+////         this.x = function(x: number, y?: A){
+////             return x > 0 ? x : y;
+////         }
+////     }
+//// }|]
+
+verify.rangeAfterCodeFix(`
+class A {
+    x: (x: number, y?: A) => number | A;
+    y: number;
+    constructor(public a: number) {
+        this.x = function(x: number, y?: A){
+            return x > 0 ? x : y;
+        }
+    }
+}
+`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);

tests/cases/fourslash/codeFixUndeclaredPropertyNumericLiteral.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+//// [|class A {
+////     constructor() {
+////         this.x = 10;
+////     }
+//// }|]
+
+verify.rangeAfterCodeFix(`
+class A {
+    x: number;
+
+    constructor() {
+        this.x = 10;
+    }
+}
+`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);

tests/cases/fourslash/codeFixUndeclaredPropertyObjectLiteral.ts

@@ -0,0 +1,19 @@
+/// <reference path='fourslash.ts' />
+
+//// [|class A {
+////     constructor() {
+////         let e: any = 10;
+////         this.x = { a: 10, b: "hello", c: undefined, d: null, e: e };
+////     }
+//// }|]
+
+verify.rangeAfterCodeFix(`
+class A {
+    x: { a: number; b: string; c: any; d: any; e: any; };
+
+    constructor() {
+        let e: any = 10;
+        this.x = { a: 10, b: "hello", c: undefined, d: null, e: e };
+    }
+}
+`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);

tests/cases/fourslash/codeFixUndeclaredPropertyObjectLiteralStrictNullChecks.ts

@@ -0,0 +1,21 @@
+/// <reference path='fourslash.ts' />
+
+// @strictNullChecks: true
+
+//// [|class A {
+////     constructor() {
+////         let e: any = 10;
+////         this.x = { a: 10, b: "hello", c: undefined, d: null, e: e };
+////     }
+//// }|]
+
+verify.rangeAfterCodeFix(`
+class A {
+    x: { a: number; b: string; c: undefined; d: null; e: any; };
+
+    constructor() {
+        let e: any = 10;
+        this.x = { a: 10, b: "hello", c: undefined, d: null, e: e };
+    }
+}
+`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);