feat(gatsby): add DANGEROUSLY_DISABLE_OOM

packages/gatsby/src/redux/__tests__/index.js

@@ -0,0 +1,46 @@
+const path = require(`path`)
+const fs = require(`fs-extra`)
+const { saveState, store } = require(`../index`)
+const {
+  actions: { createPage },
+} = require(`../actions`)
+
+jest.mock(`fs-extra`)
+
+describe(`redux db`, () => {
+  beforeEach(() => {
+    store.dispatch(
+      createPage(
+        {
+          path: `/my-sweet-new-page/`,
+          component: path.resolve(`./src/templates/my-sweet-new-page.js`),
+          // The context is passed as props to the component as well
+          // as into the component's GraphQL query.
+          context: {
+            id: `123456`,
+          },
+        },
+        { name: `default-site-plugin` }
+      )
+    )
+
+    fs.writeFile.mockClear()
+  })
+  it(`should write cache to disk`, async () => {
+    await saveState()
+
+    expect(fs.writeFile).toBeCalledWith(
+      expect.stringContaining(`.cache/redux-state.json`),
+      expect.stringContaining(`my-sweet-new-page.js`)
+    )
+  })
+
+  it(`shoudn't write cache to disk when DANGEROUSLY_DISABLE_OOM is set`, async () => {
+    process.env.DANGEROUSLY_DISABLE_OOM = `1`
+
+    await saveState()
+
+    expect(fs.writeFile).not.toBeCalled()
+    delete process.env.DANGEROUSLY_DISABLE_OOM
+  })
+})

packages/gatsby/src/redux/index.js

@@ -73,6 +73,10 @@ const store = Redux.createStore(
 
 // Persist state.
 function saveState() {
+  if (process.env.DANGEROUSLY_DISABLE_OOM) {
+    return Promise.resolve()
+  }
+
   const state = store.getState()
   const pickedState = _.pick(state, [
     `nodes`,