Function getTypingNames

test/fixtures/snapshot/typescript.js:125810–125897

* Adds inferred typings from manifest/module pairs (think package.json + node_modules) * * @param projectRootPath is the path to the directory where to look for package.json, bower.json and other typing information * @param manifestName is the name of the manif

(projectRootPath, manifestName, modulesDirName, filesToWatch)

             * @param filesToWatch are the files to watch for changes. We will push things into this array.
             */
            function getTypingNames(projectRootPath, manifestName, modulesDirName, filesToWatch) {
                // First, we check the manifests themselves. They're not
                // _required_, but they allow us to do some filtering when dealing
                // with big flat dep directories.
                var manifestPath = ts.combinePaths(projectRootPath, manifestName);
                var manifest;
                var manifestTypingNames;
                if (host.fileExists(manifestPath)) {
                    filesToWatch.push(manifestPath);
                    manifest = ts.readConfigFile(manifestPath, function (path) { return host.readFile(path); }).config;
                    manifestTypingNames = ts.flatMap([manifest.dependencies, manifest.devDependencies, manifest.optionalDependencies, manifest.peerDependencies], ts.getOwnKeys);
                    addInferredTypings(manifestTypingNames, "Typing names in '".concat(manifestPath, "' dependencies"));
                }
                // Now we scan the directories for typing information in
                // already-installed dependencies (if present). Note that this
                // step happens regardless of whether a manifest was present,
                // which is certainly a valid configuration, if an unusual one.
                var packagesFolderPath = ts.combinePaths(projectRootPath, modulesDirName);
                filesToWatch.push(packagesFolderPath);
                if (!host.directoryExists(packagesFolderPath)) {
                    return;
                }
                // There's two cases we have to take into account here:
                // 1. If manifest is undefined, then we're not using a manifest.
                //    That means that we should scan _all_ dependencies at the top
                //    level of the modulesDir.
                // 2. If manifest is defined, then we can do some special
                //    filtering to reduce the amount of scanning we need to do.
                //
                // Previous versions of this algorithm checked for a `_requiredBy`
                // field in the package.json, but that field is only present in
                // `npm@>=3 <7`.
                // Package names that do **not** provide their own typings, so
                // we'll look them up.
                var packageNames = [];
                var dependencyManifestNames = manifestTypingNames
                    // This is #1 described above.
                    ? manifestTypingNames.map(function (typingName) { return ts.combinePaths(packagesFolderPath, typingName, manifestName); })
                    // And #2. Depth = 3 because scoped packages look like `node_modules/@foo/bar/package.json`
                    : host.readDirectory(packagesFolderPath, [".json" /* Extension.Json */], /*excludes*/ undefined, /*includes*/ undefined, /*depth*/ 3)
                        .filter(function (manifestPath) {
                        if (ts.getBaseFileName(manifestPath) !== manifestName) {
                            return false;
                        }
                        // It's ok to treat
                        // `node_modules/@foo/bar/package.json` as a manifest,
                        // but not `node_modules/jquery/nested/package.json`.
                        // We only assume depth 3 is ok for formally scoped
                        // packages. So that needs this dance here.
                        var pathComponents = ts.getPathComponents(ts.normalizePath(manifestPath));
                        var isScoped = pathComponents[pathComponents.length - 3][0] === "@";
                        return isScoped && pathComponents[pathComponents.length - 4].toLowerCase() === modulesDirName || // `node_modules/@foo/bar`
                            !isScoped && pathComponents[pathComponents.length - 3].toLowerCase() === modulesDirName; // `node_modules/foo`
                    });
                if (log)
                    log("Searching for typing names in ".concat(packagesFolderPath, "; all files: ").concat(JSON.stringify(dependencyManifestNames)));
                // Once we have the names of things to look up, we iterate over
                // and either collect their included typings, or add them to the