Do not use --frozen-lockfile, it doesn't do what we think it does

.circleci/config.yml

@@ -120,7 +120,7 @@ references:
     environment:
       PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: 'true'
     name: Install dependencies
-    command: CHROMEDRIVER_VERSION=$(<.chromedriver_version) yarn install --frozen-lockfile
+    command: CHROMEDRIVER_VERSION=$(<.chromedriver_version) yarn install
 
   save-yarn-cache: &save-yarn-cache
     name: 'Save yarn cache'

.github/workflows/full-site-editing-plugin.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@master
     - name: Install dependencies
-      run: yarn install --frozen-lockfile
+      run: yarn install
     - name: Build FSE
       run: cd apps/full-site-editing && yarn build
     - name: Upload build artifact

Dockerfile

@@ -25,7 +25,7 @@ RUN        bash /tmp/env-config.sh
 # This layer is populated with up-to-date files from
 # Calypso development.
 COPY . /calypso/
-RUN yarn install --frozen-lockfile
+RUN yarn install
 
 
 # Build the final layer

bin/install-if-deps-outdated.js

@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 
 /**
- * Installs `node_modules` with `yarn install --frozen-lockfile`. Since that's a costly operation,
+ * Installs `node_modules` with `yarn install`. Since that's a costly operation,
  * it will only perform it if needed, that is, if the packages
  * installed at `node_modules` aren't in sync over what
  * `yarn.lock` has. For that, modification times of both
@@ -52,7 +52,7 @@ function install() {
 		process.exit( cleanResult.status );
 	}
 
-	const installResult = spawnSync( 'yarn', [ 'install', '--frozen-lockfile' ], {
+	const installResult = spawnSync( 'yarn', [ 'install' ], {
 		shell: true,
 		stdio: 'inherit',
 		env: { PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: 'true', ...process.env },

bin/install-if-no-packages.js

@@ -3,7 +3,7 @@ const fs = require( 'fs' );
 
 if ( ! fs.existsSync( 'node_modules' ) ) {
 	console.log( 'No "node_modules" present, installing dependencies…' );
-	const installResult = spawnSync( 'yarn', [ 'install', '--frozen-lockfile' ], {
+	const installResult = spawnSync( 'yarn', [ 'install' ], {
 		shell: true,
 		stdio: 'inherit',
 		env: { PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: 'true', ...process.env },

docs/lockfile.md

@@ -14,5 +14,5 @@ Yarn will automattically generate and update the lock file whenever `yarn`, `yar
 To verify that the new `yarn.lock` works:
 
 - Run `yarn run distclean` to delete local `node_modules`
-- Run `yarn install --frozen-lockfile`
+- Run `yarn install`
 - Verify that Calypso works as expected and that tests pass

docs/monorepo.md

@@ -156,7 +156,7 @@ git checkout master
 git pull
 git status (should be clean!)
 yarn run distclean
-yarn install --frozen-lockfile
+yarn install
 yarn run build-packages
 ```
 

package.json

@@ -114,7 +114,7 @@
 		"pretest-client": "check-npm-client && yarn run -s pretest",
 		"test-client": "check-npm-client && jest -c=test/client/jest.config.js",
 		"test-client:watch": "check-npm-client && yarn run -s test-client --watch",
-		"test-e2e": "check-npm-client && cd test/e2e && yarn install --frozen-lockfile --ignore-scripts && yarn run test",
+		"test-e2e": "check-npm-client && cd test/e2e && yarn install --ignore-scripts && yarn run test",
 		"encrypt-e2e-config": "check-npm-client && openssl enc -md sha1 -aes-256-cbc -pass env:CONFIG_KEY -out ./test/e2e/config/encrypted.enc -in ./test/e2e/config/local-$NODE_ENV.json",
 		"decrypt-e2e-config": "check-npm-client && openssl enc -md sha1 -aes-256-cbc -d -pass env:CONFIG_KEY -in ./test/e2e/config/encrypted.enc -out ./test/e2e/config/local-$NODE_ENV.json",
 		"pretest-integration": "check-npm-client && yarn run -s pretest",