chore(ci): run yarn with frozen-lockfile

.azure-pipelines-steps.yml

@@ -26,7 +26,7 @@ steps:
     displayName: 'Move source into jest folder'
 
   # Run yarn to install dependencies and build
-  - script: yarn
+  - script: yarn --frozen-lockfile
     workingDirectory: $(JEST_DIR)
     displayName: 'Install dependencies and build'
 

.circleci/config.yml

@@ -24,8 +24,9 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress
+      - run: yarn --no-progress --frozen-lockfile
       - save-cache: *save-cache
+      - run: echo server.max_workers=1 >> .flowconfig
       - run: yarn lint --format junit -o reports/junit/js-lint-results.xml && yarn typecheck && yarn lint-es5-build --format junit -o reports/junit/js-es5-lint-results.xml  && yarn lint:md:ci && yarn check-copyright-headers
       - store_test_results:
           path: reports/junit
@@ -37,7 +38,7 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress --ignore-engines
+      - run: yarn --no-progress --frozen-lockfile --ignore-engines
       - save-cache: *save-cache
       - run:
           # react-native does not work with node 6
@@ -52,7 +53,7 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress
+      - run: yarn --no-progress --frozen-lockfile
       - save-cache: *save-cache
       - run:
           command: yarn test-ci-partial
@@ -66,7 +67,7 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress
+      - run: yarn --no-progress --frozen-lockfile
       - save-cache: *save-cache
       - run:
           command: yarn test-ci
@@ -80,7 +81,7 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress
+      - run: yarn --no-progress --frozen-lockfile
       - save-cache: *save-cache
       - run:
           command: JEST_CIRCUS=1 yarn test-ci-partial
@@ -94,7 +95,7 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress
+      - run: yarn --no-progress --frozen-lockfile
       - save-cache: *save-cache
       - run:
           command: yarn test-ci-partial
@@ -108,7 +109,7 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress
+      - run: yarn --no-progress --frozen-lockfile
       - save-cache: *save-cache
       - run: yarn test-ci-es5-build-in-browser
 
@@ -120,7 +121,7 @@ jobs:
     steps:
       - checkout
       - restore-cache: *restore-cache
-      - run: yarn --no-progress
+      - run: yarn --no-progress --frozen-lockfile
       - save-cache: *save-cache
       - run:
           name: Test or Deploy Jest Website

.flowconfig

@@ -4,13 +4,6 @@
 .*/node_modules/metro/.*
 .*/node_modules/module-deps/.*
 
-[options]
-module.name_mapper='^pretty-format$' -> '<PROJECT_ROOT>/packages/pretty-format/src/index.js'
-module.name_mapper='^types/\(.*\)$' -> '<PROJECT_ROOT>/types/\1.js'
-module.name_mapper='\(jest-[^/]*\)' -> '<PROJECT_ROOT>/packages/\1/src/index.js'
-include_warnings=true
-emoji=true
-
 [strict]
 nonstrict-import
 unclear-type
@@ -20,3 +13,10 @@ untyped-type-import
 
 [version]
 ^0.91.0
+
+[options]
+module.name_mapper='^pretty-format$' -> '<PROJECT_ROOT>/packages/pretty-format/src/index.js'
+module.name_mapper='^types/\(.*\)$' -> '<PROJECT_ROOT>/types/\1.js'
+module.name_mapper='\(jest-[^/]*\)' -> '<PROJECT_ROOT>/packages/\1/src/index.js'
+include_warnings=true
+emoji=true

.travis.yml

@@ -7,6 +7,8 @@ before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH="$HOME/.yarn/bin:$PATH"
 
+install: yarn --frozen-lockfile
+
 cache:
   yarn: true
   directories:

appveyor.yml

@@ -11,7 +11,7 @@ init:
 install:
   - ps: Install-Product node $env:nodejs_version x64
   - node --version
-  - yarn
+  - yarn --frozen-lockfile
 
 cache:
   - node_modules