[now-build-utils] Use latest node if no package.json found (#3587)

In a previous release, we pinned the node version to the project so that we could upgrade new projects to a newer version of Node.js while maintaining backwards compatibility with existing projects.

This puts some burden on the user when they're deployment is a year old and their pinned version of Node reaches EOL. Because we currently force the user to add a package.json.

This PR changes the behavior so projects are no longer pinned. Instead, newer deployments get the latest Node unless they opt-in and pin via package.json.

packages/now-build-utils/src/fs/node-version.ts

@@ -25,10 +25,6 @@ const upstreamProvider =
   'This change is the result of a decision made by an upstream infrastructure provider (AWS).' +
   '\nRead more: https://docs.aws.amazon.com/lambda/latest/dg/runtime-support-policy.html';
 
-export function getOldestNodeVersion(): NodeVersion {
-  return allOptions[allOptions.length - 1];
-}
-
 export function getLatestNodeVersion(): NodeVersion {
   return allOptions[0];
 }
@@ -41,7 +37,7 @@ export async function getSupportedNodeVersion(
   engineRange?: string,
   isAuto?: boolean
 ): Promise<NodeVersion> {
-  let selection = getOldestNodeVersion();
+  let selection = getLatestNodeVersion();
 
   if (engineRange) {
     const found = allOptions.some(o => {

packages/now-build-utils/src/fs/run-user-scripts.ts

@@ -139,8 +139,8 @@ export function getSpawnOptions(
 
 export async function getNodeVersion(
   destPath: string,
-  minNodeVersion?: string,
-  config?: Config,
+  _nodeVersion?: string,
+  _config?: Config,
   meta?: Meta
 ): Promise<NodeVersion> {
   if (meta && meta.isDev) {
@@ -150,18 +150,10 @@ export async function getNodeVersion(
   }
   const { packageJson } = await scanParentDirs(destPath, true);
   let range: string | undefined;
-  let isAuto = false;
+  let isAuto = true;
   if (packageJson && packageJson.engines && packageJson.engines.node) {
     range = packageJson.engines.node;
-  } else if (minNodeVersion) {
-    range = minNodeVersion;
-    isAuto = true;
-  } else if (config && config.nodeVersion) {
-    range = config.nodeVersion;
-    isAuto = true;
-  } else if (config && config.zeroConfig) {
-    range = '10.x';
-    isAuto = true;
+    isAuto = false;
   }
   return getSupportedNodeVersion(range, isAuto);
 }

packages/now-build-utils/test/unit.test.js

@@ -96,18 +96,6 @@ it('should match all semver ranges', async () => {
   expect(await getSupportedNodeVersion('^10.5.0')).toHaveProperty('major', 10);
 });
 
-it('should select correct node version in getNodeVersion()', async () => {
-  expect(
-    await getNodeVersion('/tmp', undefined, { nodeVersion: '12.x' })
-  ).toHaveProperty('major', 12);
-  expect(
-    await getNodeVersion('/tmp', undefined, { nodeVersion: '10.x' })
-  ).toHaveProperty('major', 10);
-  expect(
-    await getNodeVersion('/tmp', '10.x', { nodeVersion: '12.x' })
-  ).toHaveProperty('major', 10);
-});
-
 it('should ignore node version in now dev getNodeVersion()', async () => {
   expect(
     await getNodeVersion(

packages/now-node/test/fixtures/10-node-engines/range/package.json

@@ -1,5 +1,5 @@
 {
   "engines": {
-    "node": "10.0.0 - 10.99.0"
+    "node": "10.0.0 - 10.99.99"
   }
 }

test/lib/run-build-lambda.js

@@ -19,11 +19,6 @@ async function runBuildLambda(inputPath) {
   const nowJson = require(nowJsonRef.fsPath);
   expect(nowJson.builds.length).toBe(1);
   const build = nowJson.builds[0];
-  if (!build.config || !build.config.nodeVersion) {
-    // Mimic api-deployments when a new project is created
-    const nodeVersion = getLatestNodeVersion().range;
-    build.config = { ...build.config, nodeVersion };
-  }
   expect(build.src.includes('*')).toBeFalsy();
   const entrypoint = build.src.replace(/^\//, ''); // strip leftmost slash
   expect(inputFiles[entrypoint]).toBeDefined();