gatsby-plugin-layout/gatsby-node.js

Reimplements the behavior of layout components in gatsby@1, which was removed in version 2.

"use strict";

var path = require("path");
var didRunAlready = false;
var absoluteComponentPath;
exports.onPreInit = function (_ref, _ref2) {
  var store = _ref.store;
  var component = _ref2.component;
  var defaultLayoutComponentPath = "src/layouts/index";
  if (!component) {
    // Default to `src/layouts/index.[js|jsx]` for drop-in replacement of v1 layouts
    component = path.join(store.getState().program.directory, defaultLayoutComponentPath);
  }
  if (didRunAlready) {
    throw new Error("You can only have single instance of gatsby-plugin-layout in your gatsby-config.js");
  }
  didRunAlready = true;
  absoluteComponentPath = component;
};
exports.onCreateWebpackConfig = function (_ref3) {
  var actions = _ref3.actions,
    plugins = _ref3.plugins;
  actions.setWebpackConfig({
    plugins: [plugins.define({
      GATSBY_LAYOUT_COMPONENT_PATH: JSON.stringify(absoluteComponentPath)
    })]
  });
};