Netlify affected builds plugin for Nx

index.mjs

// file located under: plugins/affected-build/index.mjs


/** @type {import('@netlify/build').OnPreBuild} */
export const onPreBuild = async ({ utils }) => {
  const prevCommitRef = process.env.CACHED_COMMIT_REF;
  const currentCommitRef = process.env.COMMIT_REF;
  const isInitialBuild = currentCommitRef === prevCommitRef; // check if it's the initial build
  const projectName = process.env.PROJECT_NAME; // can be set through an env variable in the `netlify.toml` or UI.

  const { stdout } = await utils.run.command(`nx print-affected --base=${prevCommitRef}`, { stdio: 'pipe', preferLocal: true });
  const { projects = [] } = JSON.parse(stdout.toString());

  const isAffected = projects.find((project) => project === projectName);

  // TODO: you can fine grain the affected logic here for other things like CMS inputs

  if (!isAffected && !isInitialBuild) {
    utils.build.cancelBuild(`Project ${projectName} is not affected`);
  }
};

manifest.yaml

# file located under: plugins/affected-build/manifest.yaml
name: affected-build

netlify.toml

[[plugins]]
package = "/plugins/affected-build/index.mjs"