Remove shims.ts and related infra (#55868)

Author: jakebailey

src/harness/fourslashImpl.ts

@@ -10,8 +10,6 @@ import ArrayOrSingle = FourSlashInterface.ArrayOrSingle;
 
 export const enum FourSlashTestType {
     Native,
-    Shims,
-    ShimsWithPreprocess,
     Server,
 }
 
@@ -202,6 +200,32 @@ const enum CallHierarchyItemDirection {
     Outgoing,
 }
 
+interface RealizedDiagnostic {
+    message: string;
+    start: number;
+    length: number;
+    category: string;
+    code: number;
+    reportsUnnecessary?: {};
+    reportsDeprecated?: {};
+}
+
+function realizeDiagnostics(diagnostics: readonly ts.Diagnostic[], newLine: string): RealizedDiagnostic[] {
+    return diagnostics.map(d => realizeDiagnostic(d, newLine));
+}
+
+function realizeDiagnostic(diagnostic: ts.Diagnostic, newLine: string): RealizedDiagnostic {
+    return {
+        message: ts.flattenDiagnosticMessageText(diagnostic.messageText, newLine),
+        start: diagnostic.start!, // TODO: GH#18217
+        length: diagnostic.length!, // TODO: GH#18217
+        category: ts.diagnosticCategoryName(diagnostic),
+        code: diagnostic.code,
+        reportsUnnecessary: diagnostic.reportsUnnecessary,
+        reportsDeprecated: diagnostic.reportsDeprecated,
+    };
+}
+
 export class TestState {
     // Language service instance
     private languageServiceAdapterHost: Harness.LanguageService.LanguageServiceAdapterHost;
@@ -267,10 +291,6 @@ export class TestState {
         switch (testType) {
             case FourSlashTestType.Native:
                 return new Harness.LanguageService.NativeLanguageServiceAdapter(cancellationToken, compilationOptions);
-            case FourSlashTestType.Shims:
-                return new Harness.LanguageService.ShimLanguageServiceAdapter(/*preprocessToResolve*/ false, cancellationToken, compilationOptions);
-            case FourSlashTestType.ShimsWithPreprocess:
-                return new Harness.LanguageService.ShimLanguageServiceAdapter(/*preprocessToResolve*/ true, cancellationToken, compilationOptions);
             case FourSlashTestType.Server:
                 return new Harness.LanguageService.ServerLanguageServiceAdapter(cancellationToken, compilationOptions);
             default:
@@ -1764,8 +1784,8 @@ export class TestState {
 
     private testDiagnostics(expected: readonly FourSlashInterface.Diagnostic[], diagnostics: readonly ts.Diagnostic[], category: string) {
         assert.deepEqual(
-            ts.realizeDiagnostics(diagnostics, "\n"),
-            expected.map((e): ts.RealizedDiagnostic => {
+            realizeDiagnostics(diagnostics, "\n"),
+            expected.map((e): RealizedDiagnostic => {
                 const range = e.range || this.getRangesInFile()[0];
                 if (!range) {
                     this.raiseError("Must provide a range for each expected diagnostic, or have one range in the fourslash source.");

src/harness/harnessLanguageService.ts

@@ -7,7 +7,7 @@ import * as ts from "./_namespaces/ts";
 
 export type TestRunnerKind = CompilerTestKind | FourslashTestKind | "project";
 export type CompilerTestKind = "conformance" | "compiler";
-export type FourslashTestKind = "fourslash" | "fourslash-shims" | "fourslash-shims-pp" | "fourslash-server";
+export type FourslashTestKind = "fourslash" | "fourslash-server";
 
 export let shards = 1;
 export let shardId = 1;

src/harness/runnerbase.ts

@@ -16,7 +16,6 @@ export * from "../suggestionDiagnostics";
 export * from "../transpile";
 export * from "../services";
 export * from "../transform";
-export * from "../shims";
 import * as BreakpointResolver from "./ts.BreakpointResolver";
 export { BreakpointResolver };
 import * as CallHierarchy from "./ts.CallHierarchy";