Update scripts and docs to use `yarn` where appropriate

Most `npm` operations are replaced with `yarn`, which generally has better
behavior. However, steps like publish that write to the NPM registry are left to
`npm`, which currently handles these tasks best.

.gitignore

@@ -3,7 +3,7 @@ npm-debug.log
 /node_modules
 /lib
 
-# version file and tarball created by 'npm pack'
+# version file and tarball created by `npm pack` / `yarn pack`
 /git-revision.txt
 /matrix-react-sdk-*.tgz
 

.travis.yml

@@ -20,7 +20,7 @@ matrix:
         - name: Linting Checks
           script:
             # run the linter, but exclude any files known to have errors or warnings.
-            - npm run lintwithexclusions
+            - yarn lintwithexclusions
         # - name: End-to-End Tests
         #   if: branch = develop
         #   install:

README.md

@@ -66,7 +66,7 @@ practices that anyone working with the SDK needs to be be aware of and uphold:
     component is a view or a structure, and then a broad functional grouping
     (e.g. 'rooms' here)
 
-  * After creating a new component you must run `npm run reskindex` to regenerate
+  * After creating a new component you must run `yarn reskindex` to regenerate
     the `component-index.js` for the SDK (used in future for skinning)
 
   * The view's CSS file MUST have the same name (e.g. view/rooms/MessageTile.css).
@@ -131,26 +131,37 @@ for now.
 Development
 ===========
 
-Ensure you have the latest stable Node JS runtime installed (v8.x is the best choice). Then check out
-the code and pull in dependencies:
+Ensure you have the latest stable Node JS runtime installed (v8.x is the best
+choice).
+
+Using `yarn` instead of `npm` is recommended. Please see the Yarn [install
+guide](https://yarnpkg.com/docs/install/) if you do not have it already.
+
+Then check out the code and pull in dependencies:
 
 ```bash
 git clone https://github.com/matrix-org/matrix-react-sdk.git
 cd matrix-react-sdk
 git checkout develop
-npm install
+yarn install
 ```
 
 `matrix-react-sdk` depends on `matrix-js-sdk`. To make use of changes in the
 latter and to ensure tests run against the develop branch of `matrix-js-sdk`,
-you should run the following which will sync changes from the JS sdk here.
+you should check out `matrix-js-sdk`, change into that new directory, and run:
 
 ```bash
-npm link ../matrix-js-sdk
+yarn link
 ```
 
-Command assumes a checked out and installed `matrix-js-sdk` folder in parent
-folder.
+Then, switch back to `matrix-react-sdk` and run:
+
+```bash
+yarn link matrix-js-sdk
+```
+
+See the [help for `yarn link`](https://yarnpkg.com/docs/cli/link) for more
+details about this.
 
 Running tests
 =============
@@ -158,5 +169,5 @@ Running tests
 Ensure you've followed the above development instructions and then:
 
 ```bash
-npm run test
+yarn test
 ```

jenkins.sh

@@ -9,24 +9,24 @@ nvm use 10
 set -x
 
 # install the other dependencies
-npm install
+yarn install
 
 scripts/fetchdep.sh matrix-org matrix-js-sdk
 rm -r node_modules/matrix-js-sdk || true
 ln -s ../matrix-js-sdk node_modules/matrix-js-sdk
-(cd matrix-js-sdk && npm install)
+(cd matrix-js-sdk && yarn install)
 
 # run the mocha tests
-npm run test -- --no-colors
+yarn test --no-colors
 
 # run eslint
-npm run lintall -- -f checkstyle -o eslint.xml || true
+yarn lintall -f checkstyle -o eslint.xml || true
 
 # re-run the linter, excluding any files known to have errors or warnings.
-npm run lintwithexclusions
+yarn lintwithexclusions
 
 # delete the old tarball, if it exists
 rm -f matrix-react-sdk-*.tgz
 
 # build our tarball
-npm pack
+yarn pack

karma.conf.js

@@ -8,7 +8,7 @@ var fs = require('fs');
  * to build everything; however it's the easiest way to load our dependencies
  * from node_modules.
  *
- * If you run karma in multi-run mode (with `npm run test-multi`), it will watch
+ * If you run karma in multi-run mode (with `yarn test-multi`), it will watch
  * the tests for changes, and webpack will rebuild using a cache. This is much quicker
  * than a clean rebuild.
  */
@@ -35,7 +35,7 @@ function fileExists(name) {
     }
 }
 
-// try find the gemini-scrollbar css in an npm-version-agnostic way
+// try find the gemini-scrollbar css in an version-agnostic way
 var gsCss = 'node_modules/gemini-scrollbar/gemini-scrollbar.css';
 if (!fileExists(gsCss)) {
     gsCss = 'node_modules/react-gemini-scrollbar/'+gsCss;
@@ -198,7 +198,7 @@ module.exports = function (config) {
                 alias: {
                     // alias any requires to the react module to the one in our
                     // path, otherwise we tend to get the react source included
-                    // twice when using npm link.
+                    // twice when using `npm link` / `yarn link`.
                     react: path.resolve('./node_modules/react'),
 
                     'matrix-react-sdk': path.resolve('test/skinned-sdk.js'),

package.json

@@ -40,17 +40,17 @@
     "rethemendex": "res/css/rethemendex.sh",
     "i18n": "matrix-gen-i18n",
     "prunei18n": "matrix-prune-i18n",
-    "build": "npm run reskindex && npm run start:init",
+    "build": "yarn reskindex && yarn start:init",
     "build:watch": "babel src -w --skip-initial-build -d lib --source-maps --copy-files",
     "emoji-data-strip": "node scripts/emoji-data-strip.js",
-    "start": "npm run start:init && npm run start:all",
-    "start:all": "concurrently --kill-others-on-fail --prefix \"{time} [{name}]\" -n build,reskindex \"npm run build:watch\" \"npm run reskindex:watch\"",
+    "start": "yarn start:init && yarn start:all",
+    "start:all": "concurrently --kill-others-on-fail --prefix \"{time} [{name}]\" -n build,reskindex \"yarn build:watch\" \"yarn reskindex:watch\"",
     "start:init": "babel src -d lib --source-maps --copy-files",
     "lint": "eslint src/",
     "lintall": "eslint src/ test/",
     "lintwithexclusions": "eslint --max-warnings 0 --ignore-path .eslintignore.errorfiles src test",
     "clean": "rimraf lib",
-    "prepublish": "npm run clean && npm run build && git rev-parse HEAD > git-revision.txt",
+    "prepublish": "yarn clean && yarn build && git rev-parse HEAD > git-revision.txt",
     "test": "karma start --single-run=true --browsers ChromeHeadless",
     "test-multi": "karma start"
   },

scripts/travis/build.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# script which is run by the travis build (after `npm run test`).
+# script which is run by the travis build (after `yarn test`).
 #
 # clones riot-web develop and runs the tests against our version of react-sdk.
 
@@ -13,7 +13,7 @@ scripts/fetchdep.sh vector-im riot-web
 pushd "$RIOT_WEB_DIR"
 
 mkdir node_modules
-npm install
+yarn install
 
 # use the version of js-sdk we just used in the react-sdk tests
 rm -r node_modules/matrix-js-sdk
@@ -23,5 +23,5 @@ ln -s "$REACT_SDK_DIR/node_modules/matrix-js-sdk" node_modules/matrix-js-sdk
 rm -r node_modules/matrix-react-sdk
 ln -s "$REACT_SDK_DIR" node_modules/matrix-react-sdk
 
-npm run build
+yarn build
 popd

scripts/travis/end-to-end-tests.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# script which is run by the travis build (after `npm run test`).
+# script which is run by the travis build (after `yarn test`).
 #
 # clones riot-web develop and runs the tests against our version of react-sdk.
 

scripts/travis/install-deps.sh

@@ -1,11 +1,11 @@
 #!/bin/sh
 
 set -ex
-npm install
+yarn install
 scripts/fetchdep.sh matrix-org matrix-js-sdk
 rm -r node_modules/matrix-js-sdk || true
 ln -s ../matrix-js-sdk node_modules/matrix-js-sdk
 
 cd matrix-js-sdk
-npm install
+yarn install
 cd ..

scripts/travis/riot-unit-tests.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# script which is run by the travis build (after `npm run test`).
+# script which is run by the travis build (after `yarn test`).
 #
 # clones riot-web develop and runs the tests against our version of react-sdk.
 
@@ -10,5 +10,5 @@ RIOT_WEB_DIR=riot-web
 
 scripts/travis/build.sh
 pushd "$RIOT_WEB_DIR"
-npm run test
+yarn test
 popd

scripts/travis/unit-tests.sh

@@ -1,10 +1,10 @@
 #!/bin/bash
 #
-# script which is run by the travis build (after `npm run test`).
+# script which is run by the travis build (after `yarn test`).
 #
 # clones riot-web develop and runs the tests against our version of react-sdk.
 
 set -ev
 
 scripts/travis/build.sh
-CHROME_BIN='/usr/bin/google-chrome-stable' npm run test
+CHROME_BIN='/usr/bin/google-chrome-stable' yarn test