Add missing extension APIs onPreBootstrap, onPostBootstrap, and onPre…

…Build (#2241)

* Add missing extension APIs onPreBootstrap, onPostBootstrap, and onPreBuild

* remove console.log

packages/gatsby-plugin-typography/src/gatsby-node.js

@@ -4,8 +4,7 @@ const os = require(`os`)
 
 // Write out a typography module to .cache.
 
-// TODO add a new API hook e.g onPreBootstrap
-exports.sourceNodes = ({ store }, pluginOptions) => {
+exports.onPreBootstrap = ({ store }, pluginOptions) => {
   const program = store.getState().program
 
   let module

packages/gatsby/src/bootstrap/index.js

@@ -234,6 +234,15 @@ module.exports = async (program: any) => {
   )
   fs.writeFileSync(`${siteDir}/api-runner-ssr.js`, sSRAPIRunner, `utf-8`)
 
+  activity.end()
+  /**
+   * Start the main bootstrap processes.
+   */
+
+  // onPreBootstrap
+  activity = report.activityTimer(`onPreBootstrap`)
+  activity.start()
+  await apiRunnerNode(`onPreBootstrap`)
   activity.end()
 
   // Source nodes
@@ -333,20 +342,6 @@ module.exports = async (program: any) => {
   await require(`../schema`)()
   activity.end()
 
-  // Load the page hot reloader. It listens for node changes
-  // and re-runs `createPages` and removes pages which weren't
-  // recreated.
-  //
-  // Algorithm is make clone of pages, run createPages, remove from
-  // both pages create by plugins only implementing `createPagesStatefully`.
-  // Check for pages not updated (need update timestamp) and remove
-  // those. yeah, just figure out in reducer if the plugin implements
-  // createPagesStatefully and mark the page as stateful to simplify
-  // things.
-  //
-  // TODO fix deleting nodes so we can both add markdown pages
-  // and remove pages as well just by adding/removing markdown files.
-
   const checkJobsDone = _.debounce(resolve => {
     const state = store.getState()
     if (state.jobs.active.length === 0) {
@@ -358,6 +353,12 @@ module.exports = async (program: any) => {
   }, 100)
 
   if (store.getState().jobs.active.length === 0) {
+    // onPostBootstrap
+    activity = report.activityTimer(`onPostBootstrap`)
+    activity.start()
+    await apiRunnerNode(`onPostBootstrap`)
+    activity.end()
+
     report.log(``)
     report.info(`bootstrap finished - ${process.uptime()} s`)
     report.log(``)

packages/gatsby/src/utils/api-node-docs.js

@@ -175,6 +175,21 @@ exports.modifyBabelrc = true
  */
 exports.modifyWebpackConfig = true
 
+/**
+ * Called at the start of the bootstrap process before any other extension APIs are called.
+ */
+exports.onPreBootstrap = true
+
+/**
+ * Called at the end of the bootstrap process after all other extension APIs have been called.
+ */
+exports.onPostBootstrap = true
+
+/**
+ * The first extension point called during the build process. Called after the bootstrap has completed but before the build steps start.
+ */
+exports.onPreBuild = true
+
 /**
  * The last extension point called after all other parts of the build process
  * are complete.

packages/gatsby/src/utils/build.js

@@ -15,6 +15,9 @@ function reportFailure(msg, err: Error) {
 
 async function html(program: any) {
   const { graphqlRunner } = await bootstrap(program)
+
+  await apiRunnerNode(`onPreBuild`, { graphql: graphqlRunner })
+
   // Copy files from the static directory to
   // an equivalent static directory within public.
   copyStaticDirectory()