chore: deprecate node v12 support (#1795)

Node v12 reaches end of life on April 30, 2022. This PR adds a warning that projen will be dropping support for old node releases. We'll give this message a week to incubate before actually bumping the version we support (#1768). --- By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
projen · Apr 25, 2022 · 6db1b04 · 6db1b04
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diff --git a/docs/node.md b/docs/node.md
@@ -3,6 +3,18 @@
 This topic describes all the features of `NodeProject` projects and their
 derivatives.
 
+## Node versioning
+
+You can specify the minimum version of node that your project supports, and the version of node used in GitHub workflows:
+
+```js
+const project = new javascript.NodeProject({
+  // ...
+  minNodeVersion: '16.0.0',
+  workflowNodeVersion: '16.1.0', // defaults to minNodeVersion
+});
+```
+
 ## Development Workflow
 
 TODO

diff --git a/src/cli/index.ts b/src/cli/index.ts
@@ -1,7 +1,9 @@
 import { resolve } from "path";
 import * as yargs from "yargs";
 import { PROJEN_RC, PROJEN_VERSION } from "../common";
+import * as logging from "../logging";
 import { TaskRuntime } from "../task-runtime";
+import { getNodeMajorVersion } from "../util";
 import { synth } from "./synth";
 import { discoverTaskCommands } from "./tasks";
 
@@ -53,6 +55,13 @@ async function main() {
     process.env.DEBUG = "true";
   }
 
+  const nodeVersion = getNodeMajorVersion();
+  if (nodeVersion && nodeVersion < 14) {
+    logging.warn(
+      `WARNING: You are using Node v${nodeVersion}, which reaches end of life on April 30, 2022. Support for EOL Node releases may be dropped by projen in the future. Please consider upgrading to Node >= 14 as soon as possible.`
+    );
+  }
+
   // no command means synthesize
   if (args._.length === 0) {
     if (args.version) {

diff --git a/src/util.ts b/src/util.ts
@@ -380,3 +380,12 @@ function decamelize(s: string, sep: string = "_") {
     return s;
   }
 }
+
+export function getNodeMajorVersion(): number | undefined {
+  const match = process.version.match(/(\d+)\.(\d+)\.(\d+)/);
+  if (match) {
+    const [major] = match.slice(1).map((x) => parseInt(x));
+    return major;
+  }
+  return undefined;
+}