Store information in buildInfo to repopulate mode mismatch based on status of package.json (#59286)

src/compiler/builder.ts

@@ -21,6 +21,7 @@ import {
     concatenate,
     convertToOptionsWithAbsolutePaths,
     createGetCanonicalFileName,
+    createModeMismatchDetails,
     createModuleNotFoundChain,
     createProgram,
     CustomTransformers,
@@ -70,7 +71,6 @@ import {
     ReadBuildProgramHost,
     ReadonlyCollection,
     RepopulateDiagnosticChainInfo,
-    RepopulateModuleNotFoundDiagnosticChain,
     returnFalse,
     returnUndefined,
     sameMap,
@@ -111,8 +111,8 @@ export interface ReusableDiagnosticRelatedInformation {
 }
 
 /** @internal */
-export interface ReusableRepopulateModuleNotFoundChain {
-    info: RepopulateModuleNotFoundDiagnosticChain;
+export interface ReusableRepopulateInfoChain {
+    info: RepopulateDiagnosticChainInfo;
     next?: ReusableDiagnosticMessageChain[];
 }
 
@@ -122,7 +122,7 @@ export type SerializedDiagnosticMessageChain = Omit<DiagnosticMessageChain, "nex
 };
 
 /** @internal */
-export type ReusableDiagnosticMessageChain = SerializedDiagnosticMessageChain | ReusableRepopulateModuleNotFoundChain;
+export type ReusableDiagnosticMessageChain = SerializedDiagnosticMessageChain | ReusableRepopulateInfoChain;
 
 /**
  * Signature (Hash of d.ts emitted), is string if it was emitted using same d.ts.map option as what compilerOptions indicate, otherwise tuple of string
@@ -538,7 +538,13 @@ function convertOrRepopulateDiagnosticMessageChain<T extends DiagnosticMessageCh
     repopulateInfo: (chain: T) => RepopulateDiagnosticChainInfo | undefined,
 ): DiagnosticMessageChain {
     const info = repopulateInfo(chain);
-    if (info) {
+    if (info === true) {
+        return {
+            ...createModeMismatchDetails(sourceFile!),
+            next: convertOrRepopulateDiagnosticMessageChainArray(chain.next as T[], sourceFile, newProgram, repopulateInfo),
+        };
+    }
+    else if (info) {
         return {
             ...createModuleNotFoundChain(sourceFile!, newProgram, info.moduleReference, info.mode, info.packageName || info.moduleReference),
             next: convertOrRepopulateDiagnosticMessageChainArray(chain.next as T[], sourceFile, newProgram, repopulateInfo),
@@ -600,7 +606,7 @@ function convertToDiagnosticRelatedInformation(
         file: sourceFile,
         messageText: isString(diagnostic.messageText) ?
             diagnostic.messageText :
-            convertOrRepopulateDiagnosticMessageChain(diagnostic.messageText, sourceFile, newProgram, chain => (chain as ReusableRepopulateModuleNotFoundChain).info),
+            convertOrRepopulateDiagnosticMessageChain(diagnostic.messageText, sourceFile, newProgram, chain => (chain as ReusableRepopulateInfoChain).info),
     };
 }
 

src/compiler/checker.ts

@@ -79,7 +79,6 @@ import {
     classOrConstructorParameterIsDecorated,
     ClassStaticBlockDeclaration,
     clear,
-    combinePaths,
     compareDiagnostics,
     comparePaths,
     compareValues,
@@ -116,6 +115,7 @@ import {
     createFlowNode,
     createGetSymbolWalker,
     createModeAwareCacheKey,
+    createModeMismatchDetails,
     createModuleNotFoundChain,
     createMultiMap,
     createNameResolver,
@@ -4627,40 +4627,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                             let diagnosticDetails;
                             const ext = tryGetExtensionFromPath(currentSourceFile.fileName);
                             if (ext === Extension.Ts || ext === Extension.Js || ext === Extension.Tsx || ext === Extension.Jsx) {
-                                const scope = currentSourceFile.packageJsonScope;
-                                const targetExt = ext === Extension.Ts ? Extension.Mts : ext === Extension.Js ? Extension.Mjs : undefined;
-                                if (scope && !scope.contents.packageJsonContent.type) {
-                                    if (targetExt) {
-                                        diagnosticDetails = chainDiagnosticMessages(
-                                            /*details*/ undefined,
-                                            Diagnostics.To_convert_this_file_to_an_ECMAScript_module_change_its_file_extension_to_0_or_add_the_field_type_Colon_module_to_1,
-                                            targetExt,
-                                            combinePaths(scope.packageDirectory, "package.json"),
-                                        );
-                                    }
-                                    else {
-                                        diagnosticDetails = chainDiagnosticMessages(
-                                            /*details*/ undefined,
-                                            Diagnostics.To_convert_this_file_to_an_ECMAScript_module_add_the_field_type_Colon_module_to_0,
-                                            combinePaths(scope.packageDirectory, "package.json"),
-                                        );
-                                    }
-                                }
-                                else {
-                                    if (targetExt) {
-                                        diagnosticDetails = chainDiagnosticMessages(
-                                            /*details*/ undefined,
-                                            Diagnostics.To_convert_this_file_to_an_ECMAScript_module_change_its_file_extension_to_0_or_create_a_local_package_json_file_with_type_Colon_module,
-                                            targetExt,
-                                        );
-                                    }
-                                    else {
-                                        diagnosticDetails = chainDiagnosticMessages(
-                                            /*details*/ undefined,
-                                            Diagnostics.To_convert_this_file_to_an_ECMAScript_module_create_a_local_package_json_file_with_type_Colon_module,
-                                        );
-                                    }
-                                }
+                                diagnosticDetails = createModeMismatchDetails(currentSourceFile);
                             }
                             diagnostics.add(createDiagnosticForNodeFromMessageChain(
                                 getSourceFileOfNode(errorNode),

src/compiler/moduleNameResolver.ts

@@ -2382,17 +2382,11 @@ export interface PackageJsonInfoContents {
  *
  * @internal
  */
-export function getPackageScopeForPath(fileName: string, state: ModuleResolutionState): PackageJsonInfo | undefined {
-    const parts = getPathComponents(fileName);
-    parts.pop();
-    while (parts.length > 0) {
-        const pkg = getPackageJsonInfo(getPathFromPathComponents(parts), /*onlyRecordFailures*/ false, state);
-        if (pkg) {
-            return pkg;
-        }
-        parts.pop();
-    }
-    return undefined;
+export function getPackageScopeForPath(directory: string, state: ModuleResolutionState): PackageJsonInfo | undefined {
+    return forEachAncestorDirectory(
+        directory,
+        dir => getPackageJsonInfo(dir, /*onlyRecordFailures*/ false, state),
+    );
 }
 
 function getVersionPathsOfPackageJsonInfo(packageJsonInfo: PackageJsonInfo, state: ModuleResolutionState): VersionPaths | undefined {
@@ -2568,7 +2562,7 @@ function noKeyStartsWithDot(obj: MapLike<unknown>) {
 }
 
 function loadModuleFromSelfNameReference(extensions: Extensions, moduleName: string, directory: string, state: ModuleResolutionState, cache: ModuleResolutionCache | undefined, redirectedReference: ResolvedProjectReference | undefined): SearchResult<Resolved> {
-    const directoryPath = getNormalizedAbsolutePath(combinePaths(directory, "dummy"), state.host.getCurrentDirectory?.());
+    const directoryPath = getNormalizedAbsolutePath(directory, state.host.getCurrentDirectory?.());
     const scope = getPackageScopeForPath(directoryPath, state);
     if (!scope || !scope.contents.packageJsonContent.exports) {
         return undefined;
@@ -2649,7 +2643,7 @@ function loadModuleFromImports(extensions: Extensions, moduleName: string, direc
         }
         return toSearchResult(/*value*/ undefined);
     }
-    const directoryPath = getNormalizedAbsolutePath(combinePaths(directory, "dummy"), state.host.getCurrentDirectory?.());
+    const directoryPath = getNormalizedAbsolutePath(directory, state.host.getCurrentDirectory?.());
     const scope = getPackageScopeForPath(directoryPath, state);
     if (!scope) {
         if (state.traceEnabled) {

src/compiler/moduleSpecifiers.ts

@@ -737,7 +737,7 @@ function getAllModulePathsWorker(info: Info, importedFileName: string, host: Mod
         // This should populate all the relevant symlinks in the symlink cache, and most, if not all, of these resolutions
         // should get (re)used.
         const state = getTemporaryModuleResolutionState(cache.getPackageJsonInfoCache(), host, {});
-        const packageJson = getPackageScopeForPath(info.importingSourceFileName, state);
+        const packageJson = getPackageScopeForPath(getDirectoryPath(info.importingSourceFileName), state);
         if (packageJson) {
             const toResolve = getAllRuntimeDependencies(packageJson.contents.packageJsonContent);
             for (const depName of (toResolve || emptyArray)) {

src/compiler/program.ts

@@ -1363,7 +1363,7 @@ export function getImpliedNodeFormatForFileWorker(
         const packageJsonLocations: string[] = [];
         state.failedLookupLocations = packageJsonLocations;
         state.affectingLocations = packageJsonLocations;
-        const packageJsonScope = getPackageScopeForPath(fileName, state);
+        const packageJsonScope = getPackageScopeForPath(getDirectoryPath(fileName), state);
         const impliedNodeFormat = packageJsonScope?.contents.packageJsonContent.type === "module" ? ModuleKind.ESNext : ModuleKind.CommonJS;
         return { impliedNodeFormat, packageJsonLocations, packageJsonScope };
     }

src/compiler/types.ts

@@ -7042,7 +7042,10 @@ export interface RepopulateModuleNotFoundDiagnosticChain {
 }
 
 /** @internal */
-export type RepopulateDiagnosticChainInfo = RepopulateModuleNotFoundDiagnosticChain;
+export type RepopulateModeMismatchDiagnosticChain = true;
+
+/** @internal */
+export type RepopulateDiagnosticChainInfo = RepopulateModuleNotFoundDiagnosticChain | RepopulateModeMismatchDiagnosticChain;
 
 /**
  * A linked list of formatted diagnostic messages to be used as part of a multiline message.

src/compiler/utilities.ts

@@ -844,6 +844,38 @@ export function createModuleNotFoundChain(sourceFile: SourceFile, host: TypeChec
     return result;
 }
 
+/** @internal */
+export function createModeMismatchDetails(currentSourceFile: SourceFile) {
+    const ext = tryGetExtensionFromPath(currentSourceFile.fileName);
+    const scope = currentSourceFile.packageJsonScope;
+    const targetExt = ext === Extension.Ts ? Extension.Mts : ext === Extension.Js ? Extension.Mjs : undefined;
+    const result = scope && !scope.contents.packageJsonContent.type ?
+        targetExt ?
+            chainDiagnosticMessages(
+                /*details*/ undefined,
+                Diagnostics.To_convert_this_file_to_an_ECMAScript_module_change_its_file_extension_to_0_or_add_the_field_type_Colon_module_to_1,
+                targetExt,
+                combinePaths(scope.packageDirectory, "package.json"),
+            ) :
+            chainDiagnosticMessages(
+                /*details*/ undefined,
+                Diagnostics.To_convert_this_file_to_an_ECMAScript_module_add_the_field_type_Colon_module_to_0,
+                combinePaths(scope.packageDirectory, "package.json"),
+            ) :
+        targetExt ?
+        chainDiagnosticMessages(
+            /*details*/ undefined,
+            Diagnostics.To_convert_this_file_to_an_ECMAScript_module_change_its_file_extension_to_0_or_create_a_local_package_json_file_with_type_Colon_module,
+            targetExt,
+        ) :
+        chainDiagnosticMessages(
+            /*details*/ undefined,
+            Diagnostics.To_convert_this_file_to_an_ECMAScript_module_create_a_local_package_json_file_with_type_Colon_module,
+        );
+    result.repopulateInfo = () => true;
+    return result;
+}
+
 function packageIdIsEqual(a: PackageId | undefined, b: PackageId | undefined): boolean {
     return a === b || !!a && !!b && a.name === b.name && a.subModuleName === b.subModuleName && a.version === b.version && a.peerDependencies === b.peerDependencies;
 }

src/server/session.ts

@@ -1712,7 +1712,7 @@ export class Session<TMessage = string> implements EventSender {
                 const packageDirectory = fileName.substring(0, nodeModulesPathParts.packageRootIndex);
                 const packageJsonCache = project.getModuleResolutionCache()?.getPackageJsonInfoCache();
                 const compilerOptions = project.getCompilationSettings();
-                const packageJson = getPackageScopeForPath(getNormalizedAbsolutePath(packageDirectory + "/package.json", project.getCurrentDirectory()), getTemporaryModuleResolutionState(packageJsonCache, project, compilerOptions));
+                const packageJson = getPackageScopeForPath(getNormalizedAbsolutePath(packageDirectory, project.getCurrentDirectory()), getTemporaryModuleResolutionState(packageJsonCache, project, compilerOptions));
                 if (!packageJson) return undefined;
                 // Use fake options instead of actual compiler options to avoid following export map if the project uses node16 or nodenext -
                 // Mapping from an export map entry across packages is out of scope for now. Returned entrypoints will only be what can be

src/testRunner/unittests/tsc/moduleResolution.ts

@@ -1,3 +1,7 @@
+import {
+    ModuleKind,
+    ScriptTarget,
+} from "../../_namespaces/ts.js";
 import { dedent } from "../../_namespaces/Utils.js";
 import { jsonToReadableText } from "../helpers.js";
 import {
@@ -6,11 +10,17 @@ import {
     getFsContentsForAlternateResultDts,
     getFsContentsForAlternateResultPackageJson,
 } from "../helpers/alternateResult.js";
-import { libContent } from "../helpers/contents.js";
+import {
+    compilerOptionsToConfigJson,
+    libContent,
+} from "../helpers/contents.js";
 import { verifyTsc } from "../helpers/tsc.js";
 import { verifyTscWatch } from "../helpers/tscWatch.js";
 import { loadProjectFromFiles } from "../helpers/vfs.js";
-import { createWatchedSystem } from "../helpers/virtualFileSystemWithWatch.js";
+import {
+    createWatchedSystem,
+    libFile,
+} from "../helpers/virtualFileSystemWithWatch.js";
 
 describe("unittests:: tsc:: moduleResolution::", () => {
     verifyTsc({
@@ -271,4 +281,40 @@ describe("unittests:: tsc:: moduleResolution::", () => {
             },
         ],
     });
+
+    verifyTsc({
+        scenario: "moduleResolution",
+        subScenario: "package json scope",
+        fs: () =>
+            loadProjectFromFiles({
+                "/src/projects/project/src/tsconfig.json": jsonToReadableText({
+                    compilerOptions: compilerOptionsToConfigJson({
+                        target: ScriptTarget.ES2016,
+                        composite: true,
+                        module: ModuleKind.Node16,
+                        traceResolution: true,
+                    }),
+                    files: [
+                        "main.ts",
+                        "fileA.ts",
+                        "fileB.mts",
+                    ],
+                }),
+                "/src/projects/project/src/main.ts": "export const x = 10;",
+                "/src/projects/project/src/fileA.ts": dedent`
+                    import { foo } from "./fileB.mjs";
+                    foo();
+                `,
+                "/src/projects/project/src/fileB.mts": "export function foo() {}",
+                "/src/projects/project/package.json": jsonToReadableText({ name: "app", version: "1.0.0" }),
+                "/lib/lib.es2016.full.d.ts": libFile.content,
+            }, { cwd: "/src/projects/project" }),
+        commandLineArgs: ["-p", "src", "--explainFiles", "--extendedDiagnostics"],
+        edits: [
+            {
+                caption: "Delete package.json",
+                edit: fs => fs.unlinkSync(`/src/projects/project/package.json`),
+            },
+        ],
+    });
 });

tests/baselines/reference/tsc/composite/synthetic-jsx-import-of-ESM-module-from-CJS-module-error-on-jsx-element.js

@@ -69,7 +69,7 @@ exports.default = (0, jsx_runtime_1.jsx)("div", {});
 
 
 //// [/tsconfig.tsbuildinfo]
-{"fileNames":["./lib/lib.d.ts","./node_modules/solid-js/jsx-runtime.d.ts","./src/main.tsx"],"fileIdsList":[[2]],"fileInfos":[{"version":"3858781397-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }\ninterface ReadonlyArray<T> {}\ndeclare const console: { log(msg: any): void; };","affectsGlobalScope":true,"impliedFormat":1},{"version":"-3511680495-export namespace JSX {\n    type IntrinsicElements = { div: {}; };\n}\n","impliedFormat":99},{"version":"-359851309-export default <div/>;","signature":"2119670487-declare const _default: any;\nexport default _default;\n","impliedFormat":1}],"root":[1,3],"options":{"composite":true,"jsx":4,"jsxImportSource":"solid-js","module":100},"referencedMap":[[3,1]],"semanticDiagnosticsPerFile":[[3,[{"start":15,"length":6,"code":1479,"category":1,"messageText":{"messageText":"The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import(\"solid-js/jsx-runtime\")' call instead.","category":1,"code":1479,"next":[{"messageText":"To convert this file to an ECMAScript module, create a local package.json file with `{ \"type\": \"module\" }`.","category":3,"code":1483}]}}]]],"latestChangedDtsFile":"./src/main.d.ts","version":"FakeTSVersion"}
+{"fileNames":["./lib/lib.d.ts","./node_modules/solid-js/jsx-runtime.d.ts","./src/main.tsx"],"fileIdsList":[[2]],"fileInfos":[{"version":"3858781397-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }\ninterface ReadonlyArray<T> {}\ndeclare const console: { log(msg: any): void; };","affectsGlobalScope":true,"impliedFormat":1},{"version":"-3511680495-export namespace JSX {\n    type IntrinsicElements = { div: {}; };\n}\n","impliedFormat":99},{"version":"-359851309-export default <div/>;","signature":"2119670487-declare const _default: any;\nexport default _default;\n","impliedFormat":1}],"root":[1,3],"options":{"composite":true,"jsx":4,"jsxImportSource":"solid-js","module":100},"referencedMap":[[3,1]],"semanticDiagnosticsPerFile":[[3,[{"start":15,"length":6,"code":1479,"category":1,"messageText":{"messageText":"The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import(\"solid-js/jsx-runtime\")' call instead.","category":1,"code":1479,"next":[{"info":true}]}}]]],"latestChangedDtsFile":"./src/main.d.ts","version":"FakeTSVersion"}
 
 //// [/tsconfig.tsbuildinfo.readable.baseline.txt]
 {
@@ -151,9 +151,7 @@ exports.default = (0, jsx_runtime_1.jsx)("div", {});
             "code": 1479,
             "next": [
               {
-                "messageText": "To convert this file to an ECMAScript module, create a local package.json file with `{ \"type\": \"module\" }`.",
-                "category": 3,
-                "code": 1483
+                "info": true
               }
             ]
           }
@@ -163,6 +161,6 @@ exports.default = (0, jsx_runtime_1.jsx)("div", {});
   ],
   "latestChangedDtsFile": "./src/main.d.ts",
   "version": "FakeTSVersion",
-  "size": 1628
+  "size": 1487
 }
 

tests/baselines/reference/tsc/moduleResolution/package-json-scope.js

@@ -0,0 +1,293 @@
+currentDirectory:: /src/projects/project useCaseSensitiveFileNames: false
+Input::
+//// [/lib/lib.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+interface ReadonlyArray<T> {}
+declare const console: { log(msg: any): void; };
+
+//// [/lib/lib.es2016.full.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+
+//// [/src/projects/project/package.json]
+{
+  "name": "app",
+  "version": "1.0.0"
+}
+
+//// [/src/projects/project/src/fileA.ts]
+import { foo } from "./fileB.mjs";
+foo();
+
+
+//// [/src/projects/project/src/fileB.mts]
+export function foo() {}
+
+//// [/src/projects/project/src/main.ts]
+export const x = 10;
+
+//// [/src/projects/project/src/tsconfig.json]
+{
+  "compilerOptions": {
+    "target": "es2016",
+    "composite": true,
+    "module": "node16",
+    "traceResolution": true
+  },
+  "files": [
+    "main.ts",
+    "fileA.ts",
+    "fileB.mts"
+  ]
+}
+
+
+
+Output::
+/lib/tsc -p src --explainFiles --extendedDiagnostics
+File '/src/projects/project/src/package.json' does not exist.
+Found 'package.json' at '/src/projects/project/package.json'.
+File '/src/projects/project/src/package.json' does not exist according to earlier cached lookups.
+File '/src/projects/project/package.json' exists according to earlier cached lookups.
+======== Resolving module './fileB.mjs' from '/src/projects/project/src/fileA.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Loading module as file / folder, candidate module location '/src/projects/project/src/fileB.mjs', target file types: TypeScript, JavaScript, Declaration.
+File name '/src/projects/project/src/fileB.mjs' has a '.mjs' extension - stripping it.
+File '/src/projects/project/src/fileB.mts' exists - use it as a name resolution result.
+======== Module name './fileB.mjs' was successfully resolved to '/src/projects/project/src/fileB.mts'. ========
+File '/lib/package.json' does not exist.
+File '/package.json' does not exist.
+src/fileA.ts:1:21 - error TS1479: The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import("./fileB.mjs")' call instead.
+  To convert this file to an ECMAScript module, change its file extension to '.mts', or add the field `"type": "module"` to '/src/projects/project/package.json'.
+
+1 import { foo } from "./fileB.mjs";
+                      ~~~~~~~~~~~~~
+
+../../../lib/lib.es2016.full.d.ts
+  Default library for target 'es2016'
+src/main.ts
+  Part of 'files' list in tsconfig.json
+  File is CommonJS module because 'package.json' does not have field "type"
+src/fileB.mts
+  Imported via "./fileB.mjs" from file 'src/fileA.ts'
+  Part of 'files' list in tsconfig.json
+src/fileA.ts
+  Part of 'files' list in tsconfig.json
+  File is CommonJS module because 'package.json' does not have field "type"
+
+Found 1 error in src/fileA.ts:1
+
+exitCode:: ExitStatus.DiagnosticsPresent_OutputsGenerated
+
+
+//// [/src/projects/project/src/fileA.d.ts]
+export {};
+
+
+//// [/src/projects/project/src/fileA.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const fileB_mjs_1 = require("./fileB.mjs");
+(0, fileB_mjs_1.foo)();
+
+
+//// [/src/projects/project/src/fileB.d.mts]
+export declare function foo(): void;
+
+
+//// [/src/projects/project/src/fileB.mjs]
+export function foo() { }
+
+
+//// [/src/projects/project/src/main.d.ts]
+export declare const x = 10;
+
+
+//// [/src/projects/project/src/main.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+exports.x = 10;
+
+
+//// [/src/projects/project/src/tsconfig.tsbuildinfo]
+{"fileNames":["../../../../lib/lib.es2016.full.d.ts","./main.ts","./fileb.mts","./filea.ts"],"fileIdsList":[[3]],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true,"impliedFormat":1},{"version":"-10726455937-export const x = 10;","signature":"-6821242887-export declare const x = 10;\n","impliedFormat":1},{"version":"3524703962-export function foo() {}","signature":"-5677608893-export declare function foo(): void;\n","impliedFormat":99},{"version":"-5325347830-import { foo } from \"./fileB.mjs\";\nfoo();\n","signature":"-3531856636-export {};\n","impliedFormat":1}],"root":[[2,4]],"options":{"composite":true,"module":100,"target":3},"referencedMap":[[4,1]],"semanticDiagnosticsPerFile":[[4,[{"start":20,"length":13,"code":1479,"category":1,"messageText":{"messageText":"The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import(\"./fileB.mjs\")' call instead.","category":1,"code":1479,"next":[{"info":true}]}}]]],"latestChangedDtsFile":"./fileA.d.ts","version":"FakeTSVersion"}
+
+//// [/src/projects/project/src/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "fileNames": [
+    "../../../../lib/lib.es2016.full.d.ts",
+    "./main.ts",
+    "./fileb.mts",
+    "./filea.ts"
+  ],
+  "fileIdsList": [
+    [
+      "./fileb.mts"
+    ]
+  ],
+  "fileInfos": {
+    "../../../../lib/lib.es2016.full.d.ts": {
+      "original": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true,
+        "impliedFormat": 1
+      },
+      "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+      "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+      "affectsGlobalScope": true,
+      "impliedFormat": "commonjs"
+    },
+    "./main.ts": {
+      "original": {
+        "version": "-10726455937-export const x = 10;",
+        "signature": "-6821242887-export declare const x = 10;\n",
+        "impliedFormat": 1
+      },
+      "version": "-10726455937-export const x = 10;",
+      "signature": "-6821242887-export declare const x = 10;\n",
+      "impliedFormat": "commonjs"
+    },
+    "./fileb.mts": {
+      "original": {
+        "version": "3524703962-export function foo() {}",
+        "signature": "-5677608893-export declare function foo(): void;\n",
+        "impliedFormat": 99
+      },
+      "version": "3524703962-export function foo() {}",
+      "signature": "-5677608893-export declare function foo(): void;\n",
+      "impliedFormat": "esnext"
+    },
+    "./filea.ts": {
+      "original": {
+        "version": "-5325347830-import { foo } from \"./fileB.mjs\";\nfoo();\n",
+        "signature": "-3531856636-export {};\n",
+        "impliedFormat": 1
+      },
+      "version": "-5325347830-import { foo } from \"./fileB.mjs\";\nfoo();\n",
+      "signature": "-3531856636-export {};\n",
+      "impliedFormat": "commonjs"
+    }
+  },
+  "root": [
+    [
+      [
+        2,
+        4
+      ],
+      [
+        "./main.ts",
+        "./fileb.mts",
+        "./filea.ts"
+      ]
+    ]
+  ],
+  "options": {
+    "composite": true,
+    "module": 100,
+    "target": 3
+  },
+  "referencedMap": {
+    "./filea.ts": [
+      "./fileb.mts"
+    ]
+  },
+  "semanticDiagnosticsPerFile": [
+    [
+      "./filea.ts",
+      [
+        {
+          "start": 20,
+          "length": 13,
+          "code": 1479,
+          "category": 1,
+          "messageText": {
+            "messageText": "The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import(\"./fileB.mjs\")' call instead.",
+            "category": 1,
+            "code": 1479,
+            "next": [
+              {
+                "info": true
+              }
+            ]
+          }
+        }
+      ]
+    ]
+  ],
+  "latestChangedDtsFile": "./fileA.d.ts",
+  "version": "FakeTSVersion",
+  "size": 1495
+}
+
+
+
+Change:: Delete package.json
+Input::
+//// [/src/projects/project/package.json] unlink
+
+
+Output::
+/lib/tsc -p src --explainFiles --extendedDiagnostics
+File '/src/projects/project/src/package.json' does not exist.
+File '/src/projects/project/package.json' does not exist.
+File '/src/projects/package.json' does not exist.
+File '/src/package.json' does not exist.
+File '/package.json' does not exist.
+File '/src/projects/project/src/package.json' does not exist according to earlier cached lookups.
+File '/src/projects/project/package.json' does not exist according to earlier cached lookups.
+File '/src/projects/package.json' does not exist according to earlier cached lookups.
+File '/src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+======== Resolving module './fileB.mjs' from '/src/projects/project/src/fileA.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Loading module as file / folder, candidate module location '/src/projects/project/src/fileB.mjs', target file types: TypeScript, JavaScript, Declaration.
+File name '/src/projects/project/src/fileB.mjs' has a '.mjs' extension - stripping it.
+File '/src/projects/project/src/fileB.mts' exists - use it as a name resolution result.
+======== Module name './fileB.mjs' was successfully resolved to '/src/projects/project/src/fileB.mts'. ========
+File '/lib/package.json' does not exist.
+File '/package.json' does not exist according to earlier cached lookups.
+src/fileA.ts:1:21 - error TS1479: The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import("./fileB.mjs")' call instead.
+  To convert this file to an ECMAScript module, change its file extension to '.mts' or create a local package.json file with `{ "type": "module" }`.
+
+1 import { foo } from "./fileB.mjs";
+                      ~~~~~~~~~~~~~
+
+../../../lib/lib.es2016.full.d.ts
+  Default library for target 'es2016'
+src/main.ts
+  Part of 'files' list in tsconfig.json
+  File is CommonJS module because 'package.json' was not found
+src/fileB.mts
+  Imported via "./fileB.mjs" from file 'src/fileA.ts'
+  Part of 'files' list in tsconfig.json
+src/fileA.ts
+  Part of 'files' list in tsconfig.json
+  File is CommonJS module because 'package.json' was not found
+
+Found 1 error in src/fileA.ts:1
+
+exitCode:: ExitStatus.DiagnosticsPresent_OutputsGenerated
+
+