Use Yarn with lerna.

.gitignore

@@ -2,6 +2,7 @@
 /node_modules
 /packages/*/build/
 /packages/*/node_modules/
+/packages/*/yarn.lock
 /coverage
 lerna-debug.log
 npm-debug.log*

lerna.json

@@ -1,6 +1,7 @@
 {
-  "lerna": "2.0.0-beta.32",
+  "lerna": "2.0.0-beta.38",
-  "version": "0.1.0",
+  "version": "19.0.2",
+  "npmClient": "yarn",
   "packages": [
     "packages/*"
   ]

package.json

@@ -22,7 +22,7 @@
     "istanbul-api": "^1.1.0",
     "istanbul-lib-coverage": "^1.0.0",
     "jest": "^19.0.2",
-    "lerna": "^2.0.0-beta.37",
+    "lerna": "v2.0.0-beta.38",
     "micromatch": "^2.3.11",
     "mkdirp": "^0.5.1",
     "sinon": "^1.17.7"

yarn.lock

@@ -570,6 +570,10 @@ cliui@^3.2.0:
     strip-ansi "^3.0.1"
     wrap-ansi "^2.0.0"
 
+clone@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/clone/-/clone-1.0.2.tgz#260b7a99ebb1edfe247538175f783243cb19d149"
+
 cmd-shim@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/cmd-shim/-/cmd-shim-2.0.2.tgz#6fcbda99483a8fd15d7d30a196ca69d688a2efdb"
@@ -604,6 +608,13 @@ color-name@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.1.tgz#4b1415304cf50028ea81643643bd82ea05803689"
 
+columnify@^1.5.4:
+  version "1.5.4"
+  resolved "https://registry.yarnpkg.com/columnify/-/columnify-1.5.4.tgz#4737ddf1c7b69a8a7c340570782e947eec8e78bb"
+  dependencies:
+    strip-ansi "^3.0.0"
+    wcwidth "^1.0.0"
+
 combined-stream@^1.0.5, combined-stream@~1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.5.tgz#938370a57b4a51dea2c77c15d5c5fdf895164009"
@@ -709,6 +720,12 @@ default-require-extensions@^1.0.0:
   dependencies:
     strip-bom "^2.0.0"
 
+defaults@^1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/defaults/-/defaults-1.0.3.tgz#c656051e9817d9ff08ed881477f3fe4019f3ef7d"
+  dependencies:
+    clone "^1.0.2"
+
 define-properties@^1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/define-properties/-/define-properties-1.1.2.tgz#83a73f2fea569898fb737193c8f873caf6d45c94"
@@ -1915,13 +1932,14 @@ lcid@^1.0.0:
   dependencies:
     invert-kv "^1.0.0"
 
-lerna@^2.0.0-beta.37:
+lerna@v2.0.0-beta.38:
-  version "2.0.0-beta.37"
+  version "2.0.0-beta.38"
-  resolved "https://registry.yarnpkg.com/lerna/-/lerna-2.0.0-beta.37.tgz#d8e1d25a75102658b12565e4aa12e0423e969aad"
+  resolved "https://registry.yarnpkg.com/lerna/-/lerna-2.0.0-beta.38.tgz#99236416a6699707336dcbdeef83c315d1f71833"
   dependencies:
     async "^1.5.0"
     chalk "^1.1.1"
     cmd-shim "^2.0.2"
+    columnify "^1.5.4"
     command-join "^2.0.0"
     cross-spawn "^4.0.0"
     glob "^7.0.6"
@@ -1938,7 +1956,6 @@ lerna@^2.0.0-beta.37:
     rimraf "^2.4.4"
     semver "^5.1.0"
     signal-exit "^3.0.2"
-    sync-exec "^0.6.2"
 
 leven@^2.0.0:
   version "2.1.0"
@@ -2722,10 +2739,6 @@ symbol-tree@^3.2.1:
   version "3.2.2"
   resolved "https://registry.yarnpkg.com/symbol-tree/-/symbol-tree-3.2.2.tgz#ae27db38f660a7ae2e1c3b7d1bc290819b8519e6"
 
-sync-exec@^0.6.2:
-  version "0.6.2"
-  resolved "https://registry.yarnpkg.com/sync-exec/-/sync-exec-0.6.2.tgz#717d22cc53f0ce1def5594362f3a89a2ebb91105"
-
 table@^3.7.8:
   version "3.8.3"
   resolved "https://registry.yarnpkg.com/table/-/table-3.8.3.tgz#2bbc542f0fda9861a755d3947fefd8b3f513855f"
@@ -2879,6 +2892,12 @@ watch@~0.10.0:
   version "0.10.0"
   resolved "https://registry.yarnpkg.com/watch/-/watch-0.10.0.tgz#77798b2da0f9910d595f1ace5b0c2258521f21dc"
 
+wcwidth@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/wcwidth/-/wcwidth-1.0.1.tgz#f0b0dcf915bc5ff1528afadb2c0e17b532da2fe8"
+  dependencies:
+    defaults "^1.0.3"
+
 webidl-conversions@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/webidl-conversions/-/webidl-conversions-3.0.1.tgz#24534275e2a7bc6be7bc86611cc16ae0a5654871"