Define interface for TSConfig. Change compilerOnSave to compileOnSave (microsoft#32481)

Author: a-tarasyuk

src/compiler/commandLineParser.ts

@@ -1743,14 +1743,24 @@ namespace ts {
         return false;
     }
 
+    /** @internal */
+    export interface TSConfig {
+        compilerOptions: CompilerOptions;
+        compileOnSave: boolean | undefined;
+        exclude?: ReadonlyArray<string>;
+        files: ReadonlyArray<string> | undefined;
+        include?: ReadonlyArray<string>;
+        references: ReadonlyArray<ProjectReference> | undefined;
+    }
+
     /**
      * Generate an uncommented, complete tsconfig for use with "--showConfig"
      * @param configParseResult options to be generated into tsconfig.json
      * @param configFileName name of the parsed config file - output paths will be generated relative to this
      * @param host provides current directory and case sensitivity services
      */
     /** @internal */
-    export function convertToTSConfig(configParseResult: ParsedCommandLine, configFileName: string, host: { getCurrentDirectory(): string, useCaseSensitiveFileNames: boolean }): object {
+    export function convertToTSConfig(configParseResult: ParsedCommandLine, configFileName: string, host: { getCurrentDirectory(): string, useCaseSensitiveFileNames: boolean }): TSConfig {
         const getCanonicalFileName = createGetCanonicalFileName(host.useCaseSensitiveFileNames);
         const files = map(
             filter(
@@ -1778,13 +1788,13 @@ namespace ts {
                 build: undefined,
                 version: undefined,
             },
-            references: map(configParseResult.projectReferences, r => ({ ...r, path: r.originalPath, originalPath: undefined })),
+            references: map(configParseResult.projectReferences, r => ({ ...r, path: r.originalPath ? r.originalPath : "", originalPath: undefined })),
             files: length(files) ? files : undefined,
             ...(configParseResult.configFileSpecs ? {
                 include: filterSameAsDefaultInclude(configParseResult.configFileSpecs.validatedIncludeSpecs),
                 exclude: configParseResult.configFileSpecs.validatedExcludeSpecs
             } : {}),
-            compilerOnSave: !!configParseResult.compileOnSave ? true : undefined
+            compileOnSave: !!configParseResult.compileOnSave ? true : undefined
         };
         return config;
     }

src/testRunner/unittests/config/showConfig.ts

@@ -53,6 +53,26 @@ namespace ts {
 
         showTSConfigCorrectly("Show TSConfig with advanced options", ["--showConfig", "--declaration", "--declarationDir", "lib", "--skipLibCheck", "--noErrorTruncation"]);
 
+        showTSConfigCorrectly("Show TSConfig with compileOnSave and more", ["-p", "tsconfig.json"], {
+            compilerOptions: {
+                esModuleInterop: true,
+                target: "es5",
+                module: "commonjs",
+                strict: true,
+            },
+            compileOnSave: true,
+            exclude: [
+                "dist"
+            ],
+            files: [],
+            include: [
+                "src/*"
+            ],
+            references: [
+                { path: "./test" }
+            ],
+        });
+
         // Regression test for https://github.com/Microsoft/TypeScript/issues/28836
         showTSConfigCorrectly("Show TSConfig with paths and more", ["-p", "tsconfig.json"], {
     compilerOptions: {

tests/baselines/reference/showConfig/Show TSConfig with compileOnSave and more/tsconfig.json

@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "esModuleInterop": true,
+        "target": "es5",
+        "module": "commonjs",
+        "strict": true
+    },
+    "references": [
+        {
+            "path": "./test"
+        }
+    ],
+    "include": [
+        "src/*"
+    ],
+    "exclude": [
+        "dist"
+    ],
+    "compileOnSave": true
+}