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filter.js	File	Edit
filter_sync.js	File	Edit
home_paths.js	File	Edit
home_paths_sync.js	File	Edit
mock.js	File	Edit
mock_sync.js	File	Edit
module_dir	Folder
module_dir.js	File	Edit
node-modules-paths.js	File	Edit
node_path	Folder
node_path.js	File	Edit
nonstring.js	File	Edit
pathfilter	Folder
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precedence	Folder
precedence.js	File	Edit
resolver	Folder
resolver.js	File	Edit
resolver_sync.js	File	Edit
shadowed_core	Folder
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subdirs.js	File	Edit
symlinks.js	File	Edit

Editing: node-modules-paths.js

var test = require('tape');
var path = require('path');
var parse = path.parse || require('path-parse');
var keys = require('object-keys');

var nodeModulesPaths = require('../lib/node-modules-paths');

var verifyDirs = function verifyDirs(t, start, dirs, moduleDirectories, paths) {
    var moduleDirs = [].concat(moduleDirectories || 'node_modules');
    if (paths) {
        for (var k = 0; k < paths.length; ++k) {
            moduleDirs.push(path.basename(paths[k]));
        }
    }

var counts = {};
    for (var j = 0; j < foundModuleDirNames.length; ++j) {
        counts[foundModuleDirs[j]] = true;
    }
    t.equal(keys(counts).length, 1, 'all found module directories had the same count');
};

test('node-modules-paths', function (t) {
    t.test('no options', function (t) {
        var start = path.join(__dirname, 'resolver');
        var dirs = nodeModulesPaths(start);

verifyDirs(t, start, dirs);

t.end();
    });

t.test('empty options', function (t) {
        var start = path.join(__dirname, 'resolver');
        var dirs = nodeModulesPaths(start, {});

verifyDirs(t, start, dirs);

t.end();
    });

t.test('with paths=array option', function (t) {
        var start = path.join(__dirname, 'resolver');
        var paths = ['a', 'b'];
        var dirs = nodeModulesPaths(start, { paths: paths });

verifyDirs(t, start, dirs, null, paths);

t.end();
    });

t.test('with paths=function option', function (t) {
        var paths = function paths(request, absoluteStart, getNodeModulesDirs, opts) {
            return getNodeModulesDirs().concat(path.join(absoluteStart, 'not node modules', request));
        };

var start = path.join(__dirname, 'resolver');
        var dirs = nodeModulesPaths(start, { paths: paths }, 'pkg');

verifyDirs(t, start, dirs, null, [path.join(start, 'not node modules', 'pkg')]);

t.end();
    });

t.test('with paths=function skipping node modules resolution', function (t) {
        var paths = function paths(request, absoluteStart, getNodeModulesDirs, opts) {
            return [];
        };
        var start = path.join(__dirname, 'resolver');
        var dirs = nodeModulesPaths(start, { paths: paths });
        t.deepEqual(dirs, [], 'no node_modules was computed');
        t.end();
    });

t.test('with moduleDirectory option', function (t) {
        var start = path.join(__dirname, 'resolver');
        var moduleDirectory = 'not node modules';
        var dirs = nodeModulesPaths(start, { moduleDirectory: moduleDirectory });

verifyDirs(t, start, dirs, moduleDirectory);

t.end();
    });

t.test('with 1 moduleDirectory and paths options', function (t) {
        var start = path.join(__dirname, 'resolver');
        var paths = ['a', 'b'];
        var moduleDirectory = 'not node modules';
        var dirs = nodeModulesPaths(start, { paths: paths, moduleDirectory: moduleDirectory });

verifyDirs(t, start, dirs, moduleDirectory, paths);

t.end();
    });

t.test('with 1+ moduleDirectory and paths options', function (t) {
        var start = path.join(__dirname, 'resolver');
        var paths = ['a', 'b'];
        var moduleDirectories = ['not node modules', 'other modules'];
        var dirs = nodeModulesPaths(start, { paths: paths, moduleDirectory: moduleDirectories });

verifyDirs(t, start, dirs, moduleDirectories, paths);

t.end();
    });

t.test('combine paths correctly on Windows', function (t) {
        var start = 'C:\\Users\\username\\myProject\\src';
        var paths = [];
        var moduleDirectories = ['node_modules', start];
        var dirs = nodeModulesPaths(start, { paths: paths, moduleDirectory: moduleDirectories });

t.equal(dirs.indexOf(path.resolve(start)) > -1, true, 'should contain start dir');

t.end();
    });

t.test('combine paths correctly on non-Windows', { skip: process.platform === 'win32' }, function (t) {
        var start = '/Users/username/git/myProject/src';
        var paths = [];
        var moduleDirectories = ['node_modules', '/Users/username/git/myProject/src'];
        var dirs = nodeModulesPaths(start, { paths: paths, moduleDirectory: moduleDirectories });

t.equal(dirs.indexOf(path.resolve(start)) > -1, true, 'should contain start dir');

t.end();
    });
});

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Editing: node-modules-paths.js