Load JavaScript modules from Node packages

.gitignore

@@ -49,3 +49,4 @@ internal/
 **/.vscode
 !**/.vscode/tasks.json
 !tests/cases/projects/projectOption/**/node_modules
+!tests/cases/projects/NodeModulesSearch/**/*

src/compiler/commandLineParser.ts

@@ -384,6 +384,11 @@ namespace ts {
             type: "boolean",
             description: Diagnostics.Do_not_emit_use_strict_directives_in_module_output
         },
+        {
+            name: "maxNodeModuleJsDepth",
+            type: "number",
+            description: Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
+        },
         {
             name: "listEmittedFiles",
             type: "boolean"

src/compiler/diagnosticMessages.json

@@ -2804,7 +2804,14 @@
         "category": "Message",
         "code": 6135
     },
-
+    "The maximum dependency depth to search under node_modules and load JavaScript files": {
+        "category": "Message",
+        "code": 6136
+    },
+    "No types specified in 'package.json' but 'allowJs' is set, so returning 'main' value of '{0}'": {
+        "category": "Message",
+        "code": 6137
+    },
     "Variable '{0}' implicitly has an '{1}' type.": {
         "category": "Error",
         "code": 7005

src/compiler/program.ts

@@ -130,10 +130,10 @@ namespace ts {
     }
 
     function tryReadTypesSection(packageJsonPath: string, baseDirectory: string, state: ModuleResolutionState): string {
-        let jsonContent: { typings?: string, types?: string };
+        let jsonContent: { typings?: string, types?: string, main?: string };
         try {
             const jsonText = state.host.readFile(packageJsonPath);
-            jsonContent = jsonText ? <{ typings?: string, types?: string }>JSON.parse(jsonText) : {};
+            jsonContent = jsonText ? <{ typings?: string, types?: string, main?: string }>JSON.parse(jsonText) : {};
         }
         catch (e) {
             // gracefully handle if readFile fails or returns not JSON
@@ -173,6 +173,14 @@ namespace ts {
             }
             return typesFilePath;
         }
+        // Use the main module for inferring types if no types package specified and the allowJs is set
+        if (state.compilerOptions.allowJs && jsonContent.main && typeof jsonContent.main === "string") {
+            if (state.traceEnabled) {
+                trace(state.host, Diagnostics.No_types_specified_in_package_json_but_allowJs_is_set_so_returning_main_value_of_0, jsonContent.main);
+            }
+            const mainFilePath = normalizePath(combinePaths(baseDirectory, jsonContent.main));
+            return mainFilePath;
+        }
         return undefined;
     }
 
@@ -610,7 +618,7 @@ namespace ts {
             failedLookupLocations, supportedExtensions, state);
 
         let isExternalLibraryImport = false;
-        if (!resolvedFileName)  {
+        if (!resolvedFileName) {
             if (moduleHasNonRelativeName(moduleName)) {
                 if (traceEnabled) {
                     trace(host, Diagnostics.Loading_module_0_from_node_modules_folder, moduleName);
@@ -740,12 +748,13 @@ namespace ts {
         const nodeModulesFolder = combinePaths(directory, "node_modules");
         const nodeModulesFolderExists = directoryProbablyExists(nodeModulesFolder, state.host);
         const candidate = normalizePath(combinePaths(nodeModulesFolder, moduleName));
-        // Load only typescript files irrespective of allowJs option if loading from node modules
-        let result = loadModuleFromFile(candidate, supportedTypeScriptExtensions, failedLookupLocations, !nodeModulesFolderExists, state);
+        const supportedExtensions = getSupportedExtensions(state.compilerOptions);
+
+        let result = loadModuleFromFile(candidate, supportedExtensions, failedLookupLocations, !nodeModulesFolderExists, state);
         if (result) {
             return result;
         }
-        result = loadNodeModuleFromDirectory(supportedTypeScriptExtensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state);
+        result = loadNodeModuleFromDirectory(supportedExtensions, candidate, failedLookupLocations, !nodeModulesFolderExists, state);
         if (result) {
             return result;
         }
@@ -1057,6 +1066,23 @@ namespace ts {
         let resolvedTypeReferenceDirectives: Map<ResolvedTypeReferenceDirective> = {};
         let fileProcessingDiagnostics = createDiagnosticCollection();
 
+        // The below settings are to track if a .js file should be add to the program if loaded via searching under node_modules.
+        // This works as imported modules are discovered recursively in a depth first manner, specifically:
+        // - For each root file, findSourceFile is called.
+        // - This calls processImportedModules for each module imported in the source file.
+        // - This calls resolveModuleNames, and then calls findSourceFile for each resolved module.
+        // As all these operations happen - and are nested - within the createProgram call, they close over the below variables.
+        // The current resolution depth is tracked by incrementing/decrementing as the depth first search progresses.
+        const maxNodeModulesJsDepth = typeof options.maxNodeModuleJsDepth === "number" ? options.maxNodeModuleJsDepth : 2;
+        let currentNodeModulesJsDepth = 0;
+
+        // If a module has some of its imports skipped due to being at the depth limit under node_modules, then track
+        // this, as it may be imported at a shallower depth later, and then it will need its skipped imports processed.
+        const modulesWithElidedImports: Map<boolean> = {};
+
+        // Track source files that are JavaScript files found by searching under node_modules, as these shouldn't be compiled.
+        const jsFilesFoundSearchingNodeModules: Map<boolean> = {};
+
         const start = new Date().getTime();
 
         host = host || createCompilerHost(options);
@@ -1211,6 +1237,7 @@ namespace ts {
                 (oldOptions.rootDir !== options.rootDir) ||
                 (oldOptions.configFilePath !== options.configFilePath) ||
                 (oldOptions.baseUrl !== options.baseUrl) ||
+                (oldOptions.maxNodeModuleJsDepth !== options.maxNodeModuleJsDepth) ||
                 !arrayIsEqualTo(oldOptions.typeRoots, oldOptions.typeRoots) ||
                 !arrayIsEqualTo(oldOptions.rootDirs, options.rootDirs) ||
                 !mapIsEqualTo(oldOptions.paths, options.paths)) {
@@ -1334,7 +1361,10 @@ namespace ts {
                 getNewLine: () => host.getNewLine(),
                 getSourceFile: program.getSourceFile,
                 getSourceFileByPath: program.getSourceFileByPath,
-                getSourceFiles: program.getSourceFiles,
+                getSourceFiles: () => filter(program.getSourceFiles(),
+                    // Remove JavaScript files found by searching node_modules from the source files to emit
+                    sourceFile => !lookUp(jsFilesFoundSearchingNodeModules, sourceFile.path)
+                ),
                 writeFile: writeFileCallback || (
                     (fileName, data, writeByteOrderMark, onError, sourceFiles) => host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles)),
                 isEmitBlocked,
@@ -1869,6 +1899,14 @@ namespace ts {
                     reportFileNamesDifferOnlyInCasingError(fileName, file.fileName, refFile, refPos, refEnd);
                 }
 
+                // See if we need to reprocess the imports due to prior skipped imports
+                if (file && lookUp(modulesWithElidedImports, file.path)) {
+                    if (currentNodeModulesJsDepth < maxNodeModulesJsDepth) {
+                        modulesWithElidedImports[file.path] = false;
+                        processImportedModules(file, getDirectoryPath(fileName));
+                    }
+                }
+
                 return file;
             }
 
@@ -2007,16 +2045,38 @@ namespace ts {
                 for (let i = 0; i < moduleNames.length; i++) {
                     const resolution = resolutions[i];
                     setResolvedModule(file, moduleNames[i], resolution);
+                    const resolvedPath = resolution ? toPath(resolution.resolvedFileName, currentDirectory, getCanonicalFileName) : undefined;
+
                     // add file to program only if:
                     // - resolution was successful
                     // - noResolve is falsy
                     // - module name comes from the list of imports
-                    const shouldAddFile = resolution &&
-                        !options.noResolve &&
-                        i < file.imports.length;
+                    // - it's not a top level JavaScript module that exceeded the search max
+                    const isJsFileUnderNodeModules = resolution && resolution.isExternalLibraryImport &&
+                                                 hasJavaScriptFileExtension(resolution.resolvedFileName);
+
+                    if (isJsFileUnderNodeModules) {
+                        jsFilesFoundSearchingNodeModules[resolvedPath] = true;
+                        currentNodeModulesJsDepth++;
+                    }
+
+                    const elideImport = isJsFileUnderNodeModules && currentNodeModulesJsDepth > maxNodeModulesJsDepth;
+                    const shouldAddFile = resolution && !options.noResolve && i < file.imports.length && !elideImport;
+
+                    if (elideImport) {
+                        modulesWithElidedImports[file.path] = true;
+                    }
+                    else if (shouldAddFile) {
+                        findSourceFile(resolution.resolvedFileName,
+                                resolvedPath,
+                                /*isDefaultLib*/ false, /*isReference*/ false,
+                                file,
+                                skipTrivia(file.text, file.imports[i].pos),
+                                file.imports[i].end);
+                    }
 
-                    if (shouldAddFile) {
-                        findSourceFile(resolution.resolvedFileName, toPath(resolution.resolvedFileName, currentDirectory, getCanonicalFileName), /*isDefaultLib*/ false, /*isReference*/ false, file, skipTrivia(file.text, file.imports[i].pos), file.imports[i].end);
+                    if (isJsFileUnderNodeModules) {
+                        currentNodeModulesJsDepth--;
                     }
                 }
             }

src/compiler/types.ts

@@ -2533,6 +2533,7 @@ namespace ts {
         declaration?: boolean;
         declarationDir?: string;
         /* @internal */ diagnostics?: boolean;
+        disableSizeLimit?: boolean;
         emitBOM?: boolean;
         emitDecoratorMetadata?: boolean;
         experimentalDecorators?: boolean;
@@ -2548,6 +2549,7 @@ namespace ts {
         /*@internal*/listFiles?: boolean;
         locale?: string;
         mapRoot?: string;
+        maxNodeModuleJsDepth?: number;
         module?: ModuleKind;
         moduleResolution?: ModuleResolutionKind;
         newLine?: NewLineKind;
@@ -2586,7 +2588,6 @@ namespace ts {
         /* @internal */ suppressOutputPathCheck?: boolean;
         target?: ScriptTarget;
         traceResolution?: boolean;
-        disableSizeLimit?: boolean;
         types?: string[];
         /** Paths used to used to compute primary types search locations */
         typeRoots?: string[];

src/compiler/utilities.ts

@@ -2275,6 +2275,7 @@ namespace ts {
         else {
             const sourceFiles = targetSourceFile === undefined ? host.getSourceFiles() : [targetSourceFile];
             for (const sourceFile of sourceFiles) {
+                // Don't emit if source file is a declaration file
                 if (!isDeclarationFile(sourceFile)) {
                     onSingleFileEmit(host, sourceFile);
                 }
@@ -2308,10 +2309,10 @@ namespace ts {
 
         function onBundledEmit(host: EmitHost) {
             // Can emit only sources that are not declaration file and are either non module code or module with --module or --target es6 specified
-            const bundledSources = filter(host.getSourceFiles(), sourceFile =>
-                !isDeclarationFile(sourceFile)                                       // Not a declaration file
-                && (!isExternalModule(sourceFile) || !!getEmitModuleKind(options))); // and not a module, unless module emit enabled
-
+            const bundledSources = filter(host.getSourceFiles(),
+                sourceFile => !isDeclarationFile(sourceFile) &&    // Not a declaration file
+                              (!isExternalModule(sourceFile) ||    // non module file
+                               !!getEmitModuleKind(options)));     // module that can emit - note falsy value from getEmitModuleKind means the module kind that shouldn't be emitted
             if (bundledSources.length) {
                 const jsFilePath = options.outFile || options.out;
                 const emitFileNames: EmitFileNames = {

src/harness/runnerbase.ts

@@ -31,18 +31,12 @@ abstract class RunnerBase {
 
     /** Replaces instances of full paths with fileNames only */
     static removeFullPaths(path: string) {
-        let fixedPath = path;
-
-        // full paths either start with a drive letter or / for *nix, shouldn't have \ in the path at this point
-        const fullPath = /(\w+:|\/)?([\w+\-\.]|\/)*\.tsx?/g;
-        const fullPathList = fixedPath.match(fullPath);
-        if (fullPathList) {
-            fullPathList.forEach((match: string) => fixedPath = fixedPath.replace(match, Harness.Path.getFileName(match)));
-        }
+        // If its a full path (starts with "C:" or "/") replace with just the filename
+        let fixedPath = /^(\w:|\/)/.test(path) ? Harness.Path.getFileName(path) : path;
 
         // when running in the browser the 'full path' is the host name, shows up in error baselines
         const localHost = /http:\/localhost:\d+/g;
         fixedPath = fixedPath.replace(localHost, "");
         return fixedPath;
     }
-}
+}

tests/baselines/reference/declarationEmit_invalidReference2.errors.txt

@@ -4,5 +4,5 @@ tests/cases/compiler/declarationEmit_invalidReference2.ts(1,1): error TS6053: Fi
 ==== tests/cases/compiler/declarationEmit_invalidReference2.ts (1 errors) ====
     /// <reference path="invalid.ts" />
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS6053: File 'invalid.ts' not found.
+!!! error TS6053: File 'tests/cases/compiler/invalid.ts' not found.
     var x = 0;

tests/baselines/reference/declarationFileOverwriteError.errors.txt

@@ -1,7 +1,7 @@
 error TS5055: Cannot write file 'tests/cases/compiler/a.d.ts' because it would overwrite input file.
 
 
-!!! error TS5055: Cannot write file 'a.d.ts' because it would overwrite input file.
+!!! error TS5055: Cannot write file 'tests/cases/compiler/a.d.ts' because it would overwrite input file.
 ==== tests/cases/compiler/a.d.ts (0 errors) ====
 
     declare class c {

tests/baselines/reference/declarationFileOverwriteErrorWithOut.errors.txt

@@ -1,7 +1,7 @@
 error TS5055: Cannot write file 'tests/cases/compiler/out.d.ts' because it would overwrite input file.
 
 
-!!! error TS5055: Cannot write file 'out.d.ts' because it would overwrite input file.
+!!! error TS5055: Cannot write file 'tests/cases/compiler/out.d.ts' because it would overwrite input file.
 ==== tests/cases/compiler/out.d.ts (0 errors) ====
 
     declare class c {

tests/baselines/reference/exportStarFromEmptyModule.errors.txt

@@ -14,7 +14,7 @@ tests/cases/compiler/exportStarFromEmptyModule_module4.ts(4,5): error TS2339: Pr
 ==== tests/cases/compiler/exportStarFromEmptyModule_module3.ts (1 errors) ====
     export * from "./exportStarFromEmptyModule_module2";
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS2306: File 'exportStarFromEmptyModule_module2.ts' is not a module.
+!!! error TS2306: File 'tests/cases/compiler/exportStarFromEmptyModule_module2.ts' is not a module.
     export * from "./exportStarFromEmptyModule_module1";
 
     export class A {

tests/baselines/reference/importNonExternalModule.errors.txt

@@ -4,7 +4,7 @@ tests/cases/conformance/externalModules/foo_1.ts(1,22): error TS2306: File 'test
 ==== tests/cases/conformance/externalModules/foo_1.ts (1 errors) ====
     import foo = require("./foo_0");
                          ~~~~~~~~~
-!!! error TS2306: File 'foo_0.ts' is not a module.
+!!! error TS2306: File 'tests/cases/conformance/externalModules/foo_0.ts' is not a module.
     // Import should fail.  foo_0 not an external module
     if(foo.answer === 42){
 

tests/baselines/reference/invalidTripleSlashReference.errors.txt

@@ -5,10 +5,10 @@ tests/cases/compiler/invalidTripleSlashReference.ts(2,1): error TS6053: File 'te
 ==== tests/cases/compiler/invalidTripleSlashReference.ts (2 errors) ====
     /// <reference path='filedoesnotexist.ts'/>
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS6053: File 'filedoesnotexist.ts' not found.
+!!! error TS6053: File 'tests/cases/compiler/filedoesnotexist.ts' not found.
     /// <reference path='otherdoesnotexist.d.ts'/>
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS6053: File 'otherdoesnotexist.d.ts' not found.
+!!! error TS6053: File 'tests/cases/compiler/otherdoesnotexist.d.ts' not found.
 
     // this test doesn't actually give the errors you want due to the way the compiler reports errors
     var x = 1;

tests/baselines/reference/jsFileCompilationWithDeclarationEmitPathSameAsInput.errors.txt

@@ -1,7 +1,7 @@
 error TS5055: Cannot write file 'tests/cases/compiler/a.d.ts' because it would overwrite input file.
 
 
-!!! error TS5055: Cannot write file 'a.d.ts' because it would overwrite input file.
+!!! error TS5055: Cannot write file 'tests/cases/compiler/a.d.ts' because it would overwrite input file.
 ==== tests/cases/compiler/a.ts (0 errors) ====
     class c {
     }

tests/baselines/reference/jsFileCompilationWithOutDeclarationFileNameSameAsInputJsFile.errors.txt

@@ -1,7 +1,7 @@
 error TS5055: Cannot write file 'tests/cases/compiler/b.d.ts' because it would overwrite input file.
 
 
-!!! error TS5055: Cannot write file 'b.d.ts' because it would overwrite input file.
+!!! error TS5055: Cannot write file 'tests/cases/compiler/b.d.ts' because it would overwrite input file.
 ==== tests/cases/compiler/a.ts (0 errors) ====
     class c {
     }

tests/baselines/reference/library-reference-5.errors.txt

@@ -18,7 +18,7 @@
 ==== /node_modules/bar/index.d.ts (1 errors) ====
     /// <reference types="alpha" />
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! message TS4090: Conflicting library definitions for 'alpha' found at 'index.d.ts' and 'index.d.ts'. Copy the correct file to the 'typings' folder to resolve this conflict.
+!!! message TS4090: Conflicting library definitions for 'alpha' found at '/node_modules/bar/node_modules/alpha/index.d.ts' and '/node_modules/foo/node_modules/alpha/index.d.ts'. Copy the correct file to the 'typings' folder to resolve this conflict.
     declare var bar: any;
 
 ==== /node_modules/bar/node_modules/alpha/index.d.ts (0 errors) ====

tests/baselines/reference/parserRealSource1.errors.txt

@@ -7,7 +7,7 @@ tests/cases/conformance/parser/ecmascript5/parserRealSource1.ts(4,1): error TS60
 
     ///<reference path='typescript.ts' />
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS6053: File 'typescript.ts' not found.
+!!! error TS6053: File 'tests/cases/conformance/parser/ecmascript5/typescript.ts' not found.
 
     module TypeScript {
         export module CompilerDiagnostics {

tests/baselines/reference/parserRealSource10.errors.txt

@@ -348,7 +348,7 @@ tests/cases/conformance/parser/ecmascript5/parserRealSource10.ts(449,40): error
 
     ///<reference path='typescript.ts' />
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS6053: File 'typescript.ts' not found.
+!!! error TS6053: File 'tests/cases/conformance/parser/ecmascript5/typescript.ts' not found.
 
     module TypeScript {
         export enum TokenID {

tests/baselines/reference/parserRealSource11.errors.txt

@@ -523,7 +523,7 @@ tests/cases/conformance/parser/ecmascript5/parserRealSource11.ts(2356,48): error
 
     ///<reference path='typescript.ts' />
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS6053: File 'typescript.ts' not found.
+!!! error TS6053: File 'tests/cases/conformance/parser/ecmascript5/typescript.ts' not found.
 
     module TypeScript {
         export class ASTSpan {

tests/baselines/reference/parserRealSource12.errors.txt

@@ -215,7 +215,7 @@ tests/cases/conformance/parser/ecmascript5/parserRealSource12.ts(524,30): error
 
     ///<reference path='typescript.ts' />
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS6053: File 'typescript.ts' not found.
+!!! error TS6053: File 'tests/cases/conformance/parser/ecmascript5/typescript.ts' not found.
 
     module TypeScript {
         export interface IAstWalker {