ng build -w does not work

[goriunov]

OS?

Mac OSX El Capitan

Versions.

angular-cli: 1.0.0-beta.16
node: 6.5.0

$ ng build -w
Could not start watchman; falling back to NodeWatcher for file system events.
Visit http://ember-cli.com/user-guide/#watchman for more info.
Path must be a string. Received null
TypeError: Path must be a string. Received null
at assertPath (path.js:7:11)
at Object.resolve (path.js:1148:7)
at Class.run (/Users/goriunov/Desktop/GitHub Repos/multiplayr-game/front-end/node_modules/angular-cli/tasks/build-webpack-watch.js:14:26)
at Class.run (/Users/goriunov/Desktop/GitHub Repos/multiplayr-game/front-end/node_modules/angular-cli/commands/build.js:50:26)
at Class. (/Users/goriunov/Desktop/GitHub Repos/multiplayr-game/front-end/node_modules/angular-cli/lib/models/command.js:152:17)
at tryCatch (/Users/goriunov/Desktop/GitHub Repos/multiplayr-game/front-end/node_modules/rsvp/dist/lib/rsvp/-internal.js:215:12)
at invokeCallback (/Users/goriunov/Desktop/GitHub Repos/multiplayr-game/front-end/node_modules/rsvp/dist/lib/rsvp/-internal.js:230:13)
at publish (/Users/goriunov/Desktop/GitHub Repos/multiplayr-game/front-end/node_modules/rsvp/dist/lib/rsvp/-internal.js:198:7)
at flush (/Users/goriunov/Desktop/GitHub Repos/multiplayr-game/front-end/node_modules/rsvp/dist/lib/rsvp/asap.js:82:5)
at _combinedTickCallback (internal/process/next_tick.js:67:7)
at process._tickCallback (internal/process/next_tick.js:98:9)

[softmodal]

I'm new to this project, but it looks like commandOptions.outputPath is getting removed somewhere along the way. I'm able to work around it in the meantime by explicitly setting the output-path flag:

ng build --w --output-path="dist"

[lucasvfventura]

This is the line in the file build-webpack-watch.js where the error occurs:

rimraf.sync(path.resolve(project.root, runTaskOptions.outputPath));

In the file build-webpack we can see that the outputPath is set to the outDir of the angular-cli.json:

var outputDir = runTaskOptions.outputPath || config_1.CliConfig.fromProject().config.apps[0].outDir;

So to fix this issue just add these three lines of code to build-webpack-watch.js:

var config_1 = require('../models/config');
...
var outputDir = runTaskOptions.outputPath || config_1.CliConfig.fromProject().config.apps[0].outDir;
rimraf.sync(path.resolve(project.root, outputDir));

[filipesilva]

Dupe of #2006

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