Skeleton for buildinfo program

Author: sheetalkamat

src/compiler/builder.ts

@@ -868,7 +868,7 @@ namespace ts {
                 rootNames: newProgramOrRootNames,
                 options: hostOrOptions as CompilerOptions,
                 host: oldProgramOrHost as CompilerHost,
-                oldProgram: oldProgram && oldProgram.getProgramOrUndefined(),
+                oldProgram: oldProgram?.getProgramOrProgramFromBuildInfoOrUndefined(),
                 configFileParsingDiagnostics,
                 projectReferences
             });
@@ -1210,6 +1210,8 @@ namespace ts {
             restoreState: noop,
             getProgram: notImplemented,
             getProgramOrUndefined: returnUndefined,
+            // TODO::
+            getProgramOrProgramFromBuildInfoOrUndefined: returnUndefined,
             releaseProgram: noop,
             getCompilerOptions: () => state.compilerOptions,
             getSourceFile: notImplemented,
@@ -1245,6 +1247,8 @@ namespace ts {
             restoreState: noop,
             getProgram,
             getProgramOrUndefined: () => getState().program,
+            // TODO::
+            getProgramOrProgramFromBuildInfoOrUndefined: () => getState().program,
             releaseProgram: () => getState().program = undefined,
             getCompilerOptions: () => getState().compilerOptions,
             getSourceFile: fileName => getProgram().getSourceFile(fileName),

src/compiler/builderPublic.ts

@@ -36,6 +36,11 @@ namespace ts {
          */
         /*@internal*/
         getProgramOrUndefined(): Program | undefined;
+        /**
+         * Returns current program that could be undefined if the program was released
+         */
+        /*@internal*/
+        getProgramOrProgramFromBuildInfoOrUndefined(): Program | ProgramFromBuildInfo | undefined;
         /**
          * Releases reference to the program, making all the other operations that need program to fail.
          */

src/compiler/resolutionCache.ts

@@ -362,6 +362,7 @@ namespace ts {
 
             // All the resolutions in this file are invalidated if this file wasnt resolved using same redirect
             const program = resolutionHost.getCurrentProgram();
+            // TODO later to see if we need to hydrate resolution cache and if we need to be able to answer this
             const oldRedirect = program && program.getResolvedProjectReferenceToRedirect(containingFile);
             const unmatchedRedirects = oldRedirect ?
                 !redirectedReference || redirectedReference.sourceFile.path !== oldRedirect.sourceFile.path :

src/compiler/types.ts

@@ -6060,7 +6060,7 @@ namespace ts {
     }
 
     /* @internal */
-    export type CreateProgramOptionsWithProgramFromBuildInfo = Omit<CreateProgramOptions, "oldProgram"> & { oldProgram: ProgramFromBuildInfo; };
+    export type CreateProgramOptionsWithProgramFromBuildInfo = Omit<CreateProgramOptions, "oldProgram"> & { oldProgram: ProgramFromBuildInfo | Program | undefined; };
 
     /* @internal */
     export interface CommandLineOptionBase {

src/compiler/watchUtilities.ts

@@ -388,7 +388,7 @@ namespace ts {
 
         // just check if sourceFile with the name exists
         const filePathWithoutExtension = removeFileExtension(fileOrDirectoryPath);
-        const realProgram = isBuilderProgram(program) ? program.getProgramOrUndefined() : program;
+        const realProgram = isBuilderProgram(program) ? program.getProgramOrProgramFromBuildInfoOrUndefined() : program;
         if (hasSourceFile((filePathWithoutExtension + Extension.Ts) as Path) ||
             hasSourceFile((filePathWithoutExtension + Extension.Tsx) as Path)) {
             writeLog(`Project: ${configFileName} Detected output file: ${fileOrDirectory}`);