target.build = function()

in make.js [107:241]
91 lines of code
19 McCabe index (conditional complexity)

target.build = function() {
    target.clean();

    ensureTool('tsc', '--version', 'Version 3.2.2');
    ensureTool('npm', '--version', function (output) {
        if (semver.lt(output, '3.0.0')) {
            fail('expected 3.0.0 or higher');
        }
    });

    taskList.forEach(function(taskName) {
        banner('Building: ' + taskName);
        var taskPath = path.join(__dirname, 'Tasks', taskName);
        ensureExists(taskPath);

        // load the task.json
        var outDir;
        var shouldBuildNode = test('-f', path.join(taskPath, 'tsconfig.json'));
        var shouldBuildPs3 = false;
        var taskJsonPath = path.join(taskPath, 'task.json');
        if (test('-f', taskJsonPath)) {
            var taskDef = require(taskJsonPath);
            validateTask(taskDef);

            // fixup the outDir (required for relative pathing in legacy L0 tests)
            outDir = path.join(buildPath, taskName);

            // create loc files
            createTaskLocJson(taskPath);
            createResjson(taskDef, taskPath);

            // determine the type of task
            shouldBuildNode = shouldBuildNode || supportedNodeTargets.some(node => taskDef.execution.hasOwnProperty(node));
            shouldBuildPs3 = taskDef.execution.hasOwnProperty('PowerShell3');
        }
        else {
            outDir = path.join(buildPath, path.basename(taskPath));
        }

        mkdir('-p', outDir);

        // get externals
        var taskMakePath = path.join(taskPath, 'make.json');
        var taskMake = test('-f', taskMakePath) ? require(taskMakePath) : {};
        if (taskMake.hasOwnProperty('externals')) {
            console.log('Getting task externals');
            getExternals(taskMake.externals, outDir);
        }

        //--------------------------------
        // Common: build, copy, install 
        //--------------------------------
        if (taskMake.hasOwnProperty('common')) {
            var common = taskMake['common'];

            common.forEach(function(mod) {
                var modPath = path.join(taskPath, mod['module']);
                var modName = path.basename(modPath);
                var modOutDir = path.join(commonPath, modName);

                if (!test('-d', modOutDir)) {
                    banner('Building module ' + modPath, true);

                    mkdir('-p', modOutDir);

                    // create loc files
                    var modJsonPath = path.join(modPath, 'module.json');
                    if (test('-f', modJsonPath)) {
                        createResjson(require(modJsonPath), modPath);
                    }

                    // npm install and compile
                    if ((mod.type === 'node' && mod.compile == true) || test('-f', path.join(modPath, 'tsconfig.json'))) {
                        buildNodeTask(modPath, modOutDir);
                    }

                    // copy default resources and any additional resources defined in the module's make.json
                    console.log();
                    console.log('> copying module resources');
                    var modMakePath = path.join(modPath, 'make.json');
                    var modMake = test('-f', modMakePath) ? require(modMakePath) : {};
                    copyTaskResources(modMake, modPath, modOutDir);

                    // get externals
                    if (modMake.hasOwnProperty('externals')) {
                        console.log('Getting module externals');
                        getExternals(modMake.externals, modOutDir);
                    }
                }

                // npm install the common module to the task dir
                if (mod.type === 'node' && mod.compile == true) {
                    mkdir('-p', path.join(taskPath, 'node_modules'));
                    rm('-Rf', path.join(taskPath, 'node_modules', modName));
                    var originalDir = pwd();
                    cd(taskPath);
                    run('npm install ' + modOutDir);
                    cd(originalDir);
                }
                // copy module resources to the task output dir
                else if (mod.type === 'ps') {
                    console.log();
                    console.log('> copying module resources to task');
                    var dest;
                    if (mod.hasOwnProperty('dest')) {
                        dest = path.join(outDir, mod.dest, modName);
                    }
                    else {
                        dest = path.join(outDir, 'ps_modules', modName);
                    }

                    matchCopy('!Tests', modOutDir, dest, { noRecurse: true });
                }
            });
        }

        // build Node task
        if (shouldBuildNode) {
            buildNodeTask(taskPath, outDir);
            lintNodeTask(taskPath, outDir);
        }

        // build PowerShell3 task
        if (shouldBuildPs3) {
            buildPs3Task(taskPath, outDir);
        }

        // copy default resources and any additional resources defined in the task's make.json
        console.log();
        console.log('> copying task resources');
        copyTaskResources(taskMake, taskPath, outDir);
    });

    banner('Build successful', true);
}