feat: use simple program for single compilation (no watch)

src/hooks/tapStartToConnectAndRunReporter.ts

@@ -90,7 +90,7 @@ function tapStartToConnectAndRunReporter(
               await previousReport.close();
             }
 
-            const report = await reporter.getReport(change);
+            const report = await reporter.getReport(change, state.watching);
             resolve(report);
 
             report

src/reporter/AggregatedReporter.ts

@@ -12,7 +12,7 @@ function createAggregatedReporter<TReporter extends Reporter>(reporter: TReporte
 
   const aggregatedReporter: TReporter = {
     ...reporter,
-    getReport: async (change) => {
+    getReport: async (change, watching) => {
       if (!pendingPromise) {
         let resolvePending: () => void;
         pendingPromise = new Promise((resolve) => {
@@ -23,7 +23,7 @@ function createAggregatedReporter<TReporter extends Reporter>(reporter: TReporte
         });
 
         return reporter
-          .getReport(change)
+          .getReport(change, watching)
           .then((report) => ({
             ...report,
             async close() {
@@ -45,7 +45,7 @@ function createAggregatedReporter<TReporter extends Reporter>(reporter: TReporte
             const change = aggregateFilesChanges(queuedChanges);
             queuedChanges = [];
 
-            return aggregatedReporter.getReport(change);
+            return aggregatedReporter.getReport(change, watching);
           } else {
             throw new OperationCanceledError('getReport canceled - new report requested.');
           }

src/reporter/Reporter.ts

@@ -2,7 +2,7 @@ import { FilesChange } from './FilesChange';
 import { Report } from './Report';
 
 interface Reporter {
-  getReport(change: FilesChange): Promise<Report>;
+  getReport(change: FilesChange, watching: boolean): Promise<Report>;
 }
 
 export { Reporter };

src/reporter/reporter-rpc/ReporterRpcClient.ts

@@ -41,8 +41,8 @@ function createReporterRpcClient<TConfiguration extends object>(
         await channel.close();
       }
     },
-    getReport: async (change) => {
-      const reportId = await rpcClient.dispatchCall(getReport, change);
+    getReport: async (change, watching) => {
+      const reportId = await rpcClient.dispatchCall(getReport, { change, watching });
 
       return {
         getDependencies() {
@@ -65,8 +65,8 @@ function composeReporterRpcClients(clients: ReporterRpcClient[]): ReporterRpcCli
     connect: () => Promise.all(clients.map((client) => client.connect())).then(() => undefined),
     disconnect: () =>
       Promise.all(clients.map((client) => client.disconnect())).then(() => undefined),
-    getReport: (change: FilesChange) =>
-      Promise.all(clients.map((client) => client.getReport(change))).then((reports) => ({
+    getReport: (change: FilesChange, watching: boolean) =>
+      Promise.all(clients.map((client) => client.getReport(change, watching))).then((reports) => ({
         getDependencies: () =>
           Promise.all(reports.map((report) => report.getDependencies())).then((dependencies) =>
             dependencies.reduce(

src/reporter/reporter-rpc/ReporterRpcProcedure.ts

@@ -4,7 +4,7 @@ import { Issue } from '../../issue';
 import { Dependencies } from '../Dependencies';
 
 const configure: RpcProcedure<object, void> = 'configure';
-const getReport: RpcProcedure<FilesChange, void> = 'getReport';
+const getReport: RpcProcedure<{ change: FilesChange; watching: boolean }, void> = 'getReport';
 const getDependencies: RpcProcedure<void, Dependencies> = 'getDependencies';
 const getIssues: RpcProcedure<void, Issue[]> = 'getIssues';
 const closeReport: RpcProcedure<void, void> = 'closeReport';

src/reporter/reporter-rpc/ReporterRpcService.ts

@@ -29,12 +29,12 @@ function registerReporterRpcService<TConfiguration extends object>(
 
       const reporter = reporterFactory(configuration);
 
-      rpcService.addCallHandler(getReport, async (change) => {
+      rpcService.addCallHandler(getReport, async ({ change, watching }) => {
         if (report) {
           throw new Error(`Close previous report before opening the next one.`);
         }
 
-        report = await reporter.getReport(change);
+        report = await reporter.getReport(change, watching);
       });
       rpcService.addCallHandler(getDependencies, () => {
         if (!report) {

src/typescript-reporter/reporter/ControlledCompilerHost.ts

@@ -0,0 +1,34 @@
+import * as ts from 'typescript';
+import { TypeScriptHostExtension } from '../extension/TypeScriptExtension';
+import { ControlledTypeScriptSystem } from './ControlledTypeScriptSystem';
+
+function createControlledCompilerHost(
+  typescript: typeof ts,
+  parsedCommandLine: ts.ParsedCommandLine,
+  system: ControlledTypeScriptSystem,
+  hostExtensions: TypeScriptHostExtension[] = []
+): ts.CompilerHost {
+  const baseCompilerHost = typescript.createCompilerHost(parsedCommandLine.options);
+
+  let controlledCompilerHost: ts.CompilerHost = {
+    ...baseCompilerHost,
+    fileExists: system.fileExists,
+    readFile: system.readFile,
+    directoryExists: system.directoryExists,
+    getDirectories: system.getDirectories,
+    realpath: system.realpath,
+  };
+
+  hostExtensions.forEach((hostExtension) => {
+    if (hostExtension.extendCompilerHost) {
+      controlledCompilerHost = hostExtension.extendCompilerHost(
+        controlledCompilerHost,
+        parsedCommandLine
+      );
+    }
+  });
+
+  return controlledCompilerHost;
+}
+
+export { createControlledCompilerHost };

src/typescript-reporter/reporter/TypeScriptReporter.ts

@@ -17,6 +17,7 @@ import {
 } from './TypeScriptConfigurationParser';
 import { createPerformance } from '../../profile/Performance';
 import { connectTypeScriptPerformance } from '../profile/TypeScriptPerformance';
+import { createControlledCompilerHost } from './ControlledCompilerHost';
 
 // write this type as it's available only in the newest TypeScript versions (^4.1.0)
 interface Tracing {
@@ -30,12 +31,14 @@ function createTypeScriptReporter(configuration: TypeScriptReporterConfiguration
   let parseConfigurationDiagnostics: ts.Diagnostic[] = [];
   let dependencies: Dependencies | undefined;
   let configurationChanged = false;
+  let compilerHost: ts.CompilerHost | undefined;
   let watchCompilerHost:
     | ts.WatchCompilerHostOfFilesAndCompilerOptions<ts.SemanticDiagnosticsBuilderProgram>
     | undefined;
   let watchSolutionBuilderHost:
     | ts.SolutionBuilderWithWatchHost<ts.SemanticDiagnosticsBuilderProgram>
     | undefined;
+  let program: ts.Program | undefined;
   let watchProgram:
     | ts.WatchOfFilesAndCompilerOptions<ts.SemanticDiagnosticsBuilderProgram>
     | undefined;
@@ -69,27 +72,27 @@ function createTypeScriptReporter(configuration: TypeScriptReporterConfiguration
     return (typescript as any).tracing;
   }
 
-  function getDiagnosticsOfBuilderProgram(builderProgram: ts.BuilderProgram) {
+  function getDiagnosticsOfProgram(program: ts.Program | ts.BuilderProgram) {
     const diagnostics: ts.Diagnostic[] = [];
 
     if (configuration.diagnosticOptions.syntactic) {
       performance.markStart('Syntactic Diagnostics');
-      diagnostics.push(...builderProgram.getSyntacticDiagnostics());
+      diagnostics.push(...program.getSyntacticDiagnostics());
       performance.markEnd('Syntactic Diagnostics');
     }
     if (configuration.diagnosticOptions.global) {
       performance.markStart('Global Diagnostics');
-      diagnostics.push(...builderProgram.getGlobalDiagnostics());
+      diagnostics.push(...program.getGlobalDiagnostics());
       performance.markEnd('Global Diagnostics');
     }
     if (configuration.diagnosticOptions.semantic) {
       performance.markStart('Semantic Diagnostics');
-      diagnostics.push(...builderProgram.getSemanticDiagnostics());
+      diagnostics.push(...program.getSemanticDiagnostics());
       performance.markEnd('Semantic Diagnostics');
     }
     if (configuration.diagnosticOptions.declaration) {
       performance.markStart('Declaration Diagnostics');
-      diagnostics.push(...builderProgram.getDeclarationDiagnostics());
+      diagnostics.push(...program.getDeclarationDiagnostics());
       performance.markEnd('Declaration Diagnostics');
     }
 
@@ -221,7 +224,7 @@ function createTypeScriptReporter(configuration: TypeScriptReporterConfiguration
   }
 
   return {
-    getReport: async ({ changedFiles = [], deletedFiles = [] }) => {
+    getReport: async ({ changedFiles = [], deletedFiles = [] }, watching) => {
       // clear cache to be ready for next iteration and to free memory
       system.clearCache();
 
@@ -233,8 +236,10 @@ function createTypeScriptReporter(configuration: TypeScriptReporterConfiguration
         // we need to re-create programs
         parsedConfiguration = undefined;
         dependencies = undefined;
+        compilerHost = undefined;
         watchCompilerHost = undefined;
         watchSolutionBuilderHost = undefined;
+        program = undefined;
         watchProgram = undefined;
         solutionBuilder = undefined;
 
@@ -346,7 +351,7 @@ function createTypeScriptReporter(configuration: TypeScriptReporterConfiguration
                 undefined,
                 (builderProgram) => {
                   const projectName = getProjectNameOfBuilderProgram(builderProgram);
-                  const diagnostics = getDiagnosticsOfBuilderProgram(builderProgram);
+                  const diagnostics = getDiagnosticsOfProgram(builderProgram);
 
                   // update diagnostics
                   diagnosticsPerProject.set(projectName, diagnostics);
@@ -379,7 +384,7 @@ function createTypeScriptReporter(configuration: TypeScriptReporterConfiguration
               solutionBuilder.build();
               performance.markEnd('Build Solutions');
             }
-          } else {
+          } else if (watching) {
             // watch compiler case
             // ensure watch compiler host exists
             if (!watchCompilerHost) {
@@ -412,7 +417,7 @@ function createTypeScriptReporter(configuration: TypeScriptReporterConfiguration
                 undefined,
                 (builderProgram) => {
                   const projectName = getProjectNameOfBuilderProgram(builderProgram);
-                  const diagnostics = getDiagnosticsOfBuilderProgram(builderProgram);
+                  const diagnostics = getDiagnosticsOfProgram(builderProgram);
 
                   // update diagnostics
                   diagnosticsPerProject.set(projectName, diagnostics);
@@ -440,6 +445,28 @@ function createTypeScriptReporter(configuration: TypeScriptReporterConfiguration
               watchProgram.updateRootFileNames(dependencies.files);
               shouldUpdateRootFiles = false;
             }
+          } else {
+            if (!compilerHost) {
+              compilerHost = createControlledCompilerHost(
+                typescript,
+                parsedConfiguration,
+                system,
+                extensions
+              );
+            }
+            if (!program) {
+              program = ts.createProgram({
+                rootNames: parsedConfiguration.fileNames,
+                options: parsedConfiguration.options,
+                projectReferences: parsedConfiguration.projectReferences,
+                host: compilerHost,
+              });
+            }
+            const diagnostics = getDiagnosticsOfProgram(program);
+            const projectName = getConfigFilePathFromCompilerOptions(program.getCompilerOptions());
+
+            // update diagnostics
+            diagnosticsPerProject.set(projectName, diagnostics);
           }
 
           changedFiles.forEach((changedFile) => {