Function getResolutionDiagnostic

test/fixtures/snapshot/typescript.js:119487–119512

* Returns a DiagnosticMessage if we won't include a resolved module due to its extension. * The DiagnosticMessage's parameters are the imported module name, and the filename it resolved to. * This returns a diagnostic even if the module will be an untyped module.

(options, _a)

     * This returns a diagnostic even if the module will be an untyped module.
     */
    function getResolutionDiagnostic(options, _a) {
        var extension = _a.extension;
        switch (extension) {
            case ".ts" /* Extension.Ts */:
            case ".d.ts" /* Extension.Dts */:
                // These are always allowed.
                return undefined;
            case ".tsx" /* Extension.Tsx */:
                return needJsx();
            case ".jsx" /* Extension.Jsx */:
                return needJsx() || needAllowJs();
            case ".js" /* Extension.Js */:
                return needAllowJs();
            case ".json" /* Extension.Json */:
                return needResolveJsonModule();
        }
        function needJsx() {
            return options.jsx ? undefined : ts.Diagnostics.Module_0_was_resolved_to_1_but_jsx_is_not_set;
        }
        function needAllowJs() {
            return ts.getAllowJSCompilerOption(options) || !ts.getStrictOptionValue(options, "noImplicitAny") ? undefined : ts.Diagnostics.Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type;
        }
        function needResolveJsonModule() {
            return options.resolveJsonModule ? undefined : ts.Diagnostics.Module_0_was_resolved_to_1_but_resolveJsonModule_is_not_used;
        }
    }
    ts.getResolutionDiagnostic = getResolutionDiagnostic;
    function getModuleNames(_a) {
        var imports = _a.imports, moduleAugmentations = _a.moduleAugmentations;