Never install optional packages

Author: clebeaupin

.yarnrc

@@ -0,0 +1 @@
+ignore-optional true

README.md

@@ -17,7 +17,7 @@ In readium-desktop project
 
 ### Install readium-desktop dependencies
 
-1) `yarn install --ignore-optional --pure-lockfile` (initialize local `node_modules` packages from dependencies declared in `package.json`)
+1) `yarn install` (initialize local `node_modules` packages from dependencies declared in `package.json`)
 2) `yarn pouchdb:install`
 
 ### Start application in dev environment

package.json

@@ -22,7 +22,7 @@
     "start:dev:renderer": "webpack-dev-server",
     "start:dev:main": "webpack -d && electron .",
     "start:dev": "concurrently --kill-others \"npm run start:dev:renderer\" \"npm run start:dev:main\"",
-    "pouchdb:install": "yarn add -O --no-lockfile @types/pouchdb && yarn add --no-lockfile --ignore-scripts -O pouchdb && cd node_modules/pouchdb && cross-env npm_config_runtime=electron npm_config_target=53 yarn add --no-lockfile -O leveldown@latest"
+    "pouchdb:install": "yarn add -O --no-lockfile --ignore-scripts leveldown && yarn add --no-lockfile --ignore-scripts -O pouchdb && cd node_modules/pouchdb && cross-env npm_config_runtime=electron npm_config_target=53 yarn add --no-lockfile leveldown@latest && cd ../.. && yarn remove leveldown --no-lockfile --ignore-scripts"
   },
   "repository": {
     "type": "git",
@@ -110,7 +110,5 @@
     "webpack": "^2.2.1",
     "webpack-dev-server": "^2.4.1"
   },
-  "optionalDependencies": {
-    "pouchdb": "^6.2.0"
-  }
+  "optionalDependencies": {}
 }