Add quick fix to disable error checking in a .js file

src/compiler/diagnosticMessages.json

@@ -3355,6 +3355,16 @@
         "category": "Message",
         "code": 90017
     },
+    "Disable checking for this file.": {
+        "category": "Message",
+        "code": 90018
+    },
+    "Suppress this error message.": {
+        "category": "Message",
+        "code": 90019
+    },
+
+
     "Octal literal types must use ES2015 syntax. Use the syntax '{0}'.": {
         "category": "Error",
         "code": 8017

src/services/codefixes/disableJsDiagnostics.ts

@@ -0,0 +1,67 @@
+/* @internal */
+namespace ts.codefix {
+    registerCodeFix({
+        errorCodes: getApplicableDiagnosticCodes(),
+        getCodeActions: getDisableJsDiagnosticsCodeActions
+    });
+
+    function getApplicableDiagnosticCodes(): number[] {
+        const allDiagnostcs = <MapLike<DiagnosticMessage>>Diagnostics;
+        return Object.keys(allDiagnostcs)
+            .filter(d => allDiagnostcs[d] && allDiagnostcs[d].category === DiagnosticCategory.Error)
+            .map(d => allDiagnostcs[d].code);
+    }
+
+    function shouldCheckJsFile(sourceFile: SourceFile, compilerOptions: CompilerOptions) {
+        return sourceFile.checkJsDirective ? sourceFile.checkJsDirective.enabled : compilerOptions.checkJs;
+    }
+
+    function getSuppressCommentLocationForLocation(sourceFile: SourceFile, position: number, newLineCharacter: string) {
+        let { line } = getLineAndCharacterOfPosition(sourceFile, position);
+        const lineStartPosition = getStartPositionOfLine(line, sourceFile);
+        const startPosition = getFirstNonSpaceCharacterPosition(sourceFile.text, lineStartPosition);
+        if (!isInComment(sourceFile, startPosition) && !isInString(sourceFile, startPosition) && !isInTemplateString(sourceFile, startPosition)) {
+            const token = getTouchingToken(sourceFile, startPosition);
+            const tokenLeadingCommnets = getLeadingCommentRangesOfNode(token, sourceFile)
+            if (!tokenLeadingCommnets || !tokenLeadingCommnets.length || tokenLeadingCommnets[0].pos >= startPosition) {
+                return {
+                    span: { start: startPosition, length: 0 },
+                    newText: `// @ts-suppress${newLineCharacter}`
+                };
+            }
+        }
+        return {
+            span: { start: position, length: 0 },
+            newText: `${position === startPosition ? "" : newLineCharacter}// @ts-suppress${newLineCharacter}`
+        };
+    }
+
+    function getDisableJsDiagnosticsCodeActions(context: CodeFixContext): CodeAction[] | undefined {
+        const { sourceFile, program, newLineCharacter, span } = context;
+
+        if (!isInJavaScriptFile(sourceFile) || !shouldCheckJsFile(sourceFile, program.getCompilerOptions())) {
+            return undefined;
+        }
+
+        return [{
+            description: getLocaleSpecificMessage(Diagnostics.Suppress_this_error_message),
+            changes: [{
+                fileName: sourceFile.fileName,
+                textChanges: [getSuppressCommentLocationForLocation(sourceFile, span.start, newLineCharacter)]
+            }]
+        },
+        {
+            description: getLocaleSpecificMessage(Diagnostics.Disable_checking_for_this_file),
+            changes: [{
+                fileName: sourceFile.fileName,
+                textChanges: [{
+                    span: {
+                        start: sourceFile.checkJsDirective ? sourceFile.checkJsDirective.pos : 0,
+                        length: sourceFile.checkJsDirective ? sourceFile.checkJsDirective.end - sourceFile.checkJsDirective.pos : 0
+                    },
+                    newText: `// @ts-nocheck${newLineCharacter}`
+                }]
+            }]
+        }];
+    }
+}

src/services/codefixes/fixes.ts

@@ -7,4 +7,5 @@
 /// <reference path="fixForgottenThisPropertyAccess.ts" />
 /// <reference path='unusedIdentifierFixes.ts' />
 /// <reference path='importFixes.ts' />
+/// <reference path='disableJsDiagnostics.ts' />
 /// <reference path='helpers.ts' />

src/services/codefixes/unusedIdentifierFixes.ts

@@ -105,9 +105,10 @@ namespace ts.codefix {
                             else {
                                 // import |d,| * as ns from './file'
                                 const start = importClause.name.getStart();
-                                let end = findFirstNonSpaceCharPosStarting(importClause.name.end);
+                                const text = sourceFile.text;
+                                let end = getFirstNonSpaceCharacterPosition(text, importClause.name.end);
                                 if (sourceFile.text.charCodeAt(end) === CharacterCodes.comma) {
-                                    end = findFirstNonSpaceCharPosStarting(end + 1);
+                                    end = getFirstNonSpaceCharacterPosition(text, end + 1);
                                 }
 
                                 return createCodeFix("", start, end - start);
@@ -166,13 +167,6 @@ namespace ts.codefix {
                 return createCodeFix("", start, end - start);
             }
 
-            function findFirstNonSpaceCharPosStarting(start: number) {
-                while (isWhiteSpace(sourceFile.text.charCodeAt(start))) {
-                    start += 1;
-                }
-                return start;
-            }
-
             function createCodeFix(newText: string, start: number, length: number): CodeAction[] {
                 return [{
                     description: formatStringFromArgs(getLocaleSpecificMessage(Diagnostics.Remove_declaration_for_Colon_0), { 0: token.getText() }),

src/services/tsconfig.json

@@ -90,6 +90,7 @@
         "codefixes/fixes.ts",
         "codefixes/helpers.ts",
         "codefixes/importFixes.ts",
-        "codefixes/unusedIdentifierFixes.ts"
+        "codefixes/unusedIdentifierFixes.ts",
+        "codefixes/disableJsDiagnostics.ts"
     ]
 }

src/services/utilities.ts

@@ -1388,4 +1388,11 @@ namespace ts {
         // First token is the open curly, this is where we want to put the 'super' call.
         return constructor.body.getFirstToken(sourceFile).getEnd();
     }
+
+    export function getFirstNonSpaceCharacterPosition(text: string, position: number) {
+        while (isWhiteSpace(text.charCodeAt(position))) {
+            position += 1;
+        }
+        return position;
+    }
 }

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile.ts

@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @noEmit: true
+
+// @Filename: a.js
+////[|// @ts-check|]
+////var x = "";
+////x = 1;
+
+verify.rangeAfterCodeFix("// @ts-nocheck", /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 1);

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile2.ts

@@ -0,0 +1,15 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @noEmit: true
+// @checkJs: true
+
+// @Filename: a.js
+////[|var x = "";
+////x = 1;|]
+
+// Disable checking for the whole file
+verify.rangeAfterCodeFix(`// @ts-nocheck
+var x = "";
+x = 1;`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 1);
+

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile3.ts

@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @noEmit: true
+// @checkJs: true
+
+// @Filename: a.js
+////[|var x = "";
+////x = 1;|]
+
+// Disable checking for next line
+verify.rangeAfterCodeFix(`var x = "";
+// @ts-suppress
+x = 1;`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile4.ts

@@ -0,0 +1,18 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @noEmit: true
+// @checkJs: true
+
+// @Filename: a.js
+////var x = "";
+////
+////[|"test \
+////"; x = 1;|]
+
+// Disable checking for next line
+verify.rangeAfterCodeFix(`"test \\
+";
+// @ts-suppress
+x = 1;`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);
+

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile5.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @noEmit: true
+// @checkJs: true
+
+// @Filename: a.js
+////var x = "";
+////
+////[|/** comment */
+////x = 1;|]
+
+// Disable checking for next line
+verify.rangeAfterCodeFix(`/** comment */
+// @ts-suppress
+x = 1;`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);
+

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile6.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @noEmit: true
+// @checkJs: true
+
+// @Filename: a.js
+////var x = 0;
+////
+////function f(_a) {
+////    [|f(x());|]
+////}
+
+// Disable checking for next line
+verify.rangeAfterCodeFix(`// @ts-suppress
+    f(x());`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);
+

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile7.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @noEmit: true
+// @checkJs: true
+
+// @Filename: a.js
+////var x = 0;
+////
+////function f(_a) {
+////    [|x();|]
+////}
+
+// Disable checking for next line
+verify.rangeAfterCodeFix(`// @ts-suppress
+    x();`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);
+

tests/cases/fourslash/codeFixDisableJsDiagnosticsInFile8.ts

@@ -0,0 +1,19 @@
+/// <reference path='fourslash.ts' />
+
+// @allowjs: true
+// @noEmit: true
+// @checkJs: true
+
+// @Filename: a.js
+////var x = 0;
+////
+////function f(_a) {
+////    /** comment for f */
+////    [|f(x());|]
+////}
+
+// Disable checking for next line
+verify.rangeAfterCodeFix(`f(
+    // @ts-suppress
+    x());`, /*includeWhiteSpace*/ false, /*errorCode*/ undefined, /*index*/ 0);
+