Don't implicit-any diagnostic for json module

Author: Andy Hanson

src/compiler/checker.ts

@@ -2241,7 +2241,7 @@ namespace ts {
             const sourceFile = resolvedModule && !resolutionDiagnostic && host.getSourceFile(resolvedModule.resolvedFileName);
             if (sourceFile) {
                 if (sourceFile.symbol) {
-                    if (resolvedModule.isExternalLibraryImport && !extensionIsTS(resolvedModule.extension)) {
+                    if (resolvedModule.isExternalLibraryImport && !resolutionExtensionIsTSOrJson(resolvedModule.extension)) {
                         errorOnImplicitAnyModule(/*isError*/ false, errorNode, resolvedModule, moduleReference);
                     }
                     // merged symbol is module declaration symbol combined with all augmentations

tests/cases/fourslash/codeFixCannotFindModule_suggestion_falsePositive.ts

@@ -0,0 +1,16 @@
+/// <reference path='fourslash.ts' />
+
+// @moduleResolution: node
+// @resolveJsonModule: true
+// @strict: true
+
+// @Filename: /node_modules/foo/bar.json
+////export const x = 0;
+
+// @Filename: /a.ts
+////import abs = require([|"foo/bar.json"|]);
+////abs;
+
+verify.noErrors();
+goTo.file("/a.ts");
+verify.getSuggestionDiagnostics([]);