Bump minimum required version: node>=12.9, npm>=6.9 (#1192)

* Move minimum supported version: node=12, npm=6.9

* Add missing bits and documentation for future bumping

Co-authored-by: Ronan Jouchet <ronan@jouchet.fr>

.github/workflows/ci.yml

@@ -13,8 +13,17 @@ jobs:
     strategy:
       matrix:
         node-version:
-        - 16.x # Changing this? Remind to keep linter conditions below and in publish.yml aligned.
+        # Align the top Node version here with: 1. linter conditions later below, 2. publish.yml.
-        - 10.x
+        - 16.x
+        # Bumping the minimum required Node version? You must bump:
+        #   1. package.json -> engines.node
+        #   2. package.json -> devDependencies.@types/node
+        #   3. tsconfig.json -> {target, lib}
+        #   4. .github/workflows/ci.yml -> node-version
+        #
+        # Here in ci.yml, we want to always run the oldest version we require in
+        # package.json -> engines.node, to be sure Nativefier runs on this minimum
+        - 12.x
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:

.gitignore

@@ -57,3 +57,6 @@ gen
 nativefier*.tgz
 
 .vscode
+
+# https://github.com/nektos/act
+.actrc

package.json

@@ -4,9 +4,11 @@
   "description": "Wrap web apps natively",
   "license": "MIT",
   "author": "Goh Jia Hao",
+  "engines_README": "Bumping the minimum required Node version? You must bump: 1. package.json -> engines.node, 2. package.json -> devDependencies.@types/node , 3. tsconfig.json -> {target, lib} , 4. .github/workflows/ci.yml -> node-version",
+  "engines_READMEforEnginesNode": "Here in engines.node, we require a version as old as possible, for Nativefier to be easily installable using the stock Node.js shipped by conservative Linux distros. It's a balancing act between this, and our own dependencies requiring more a recent Node; as much as possible, try to keep supporting Debian stable; https://packages.debian.org/search?suite=stable&keywords=nodejs",
   "engines": {
-    "node": ">= 10.0.0",
+    "node": ">= 12.9.0",
-    "npm": ">= 6.0.0"
+    "npm": ">= 6.9.0"
   },
   "keywords": [
     "desktop",
@@ -66,7 +68,7 @@
   "devDependencies": {
     "@types/jest": "^26.0.20",
     "@types/ncp": "^2.0.4",
-    "@types/node": "^10.17.55",
+    "@types/node": "^12.12.6",
     "@types/page-icon": "^0.3.3",
     "@types/tmp": "^0.2.0",
     "@typescript-eslint/eslint-plugin": "^4.17.0",

tsconfig.json

@@ -9,10 +9,22 @@
       "resolveJsonModule": true,
       "skipLibCheck": true,
       "sourceMap": true,
-      // https://stackoverflow.com/questions/51716406/typescript-tsconfig-settings-for-node-js-10
+      // Bumping the minimum required Node version? You must bump:
-      // and 'dom' to tell tsc it's okay to use the URL object (which is in Node >= 7)
+      //   1. package.json -> engines.node
-      "target": "es2018",
+      //   2. package.json -> devDependencies.@types/node
-      "lib": ["es2018", "dom"]
+      //   3. tsconfig.json -> {target, lib}
+      //   4. .github/workflows/ci.yml -> node-version
+      //
+      // Here in tsconfig.json, we want to set the `target` and `lib` keys
+      // to the "best" values for the minimum/required version of node.
+      // TS doesn't offer any easy "preset" for this, so the best we have is to
+      // believe people who know which {syntax, library} parts of current EcmaScript
+      // are supported for our version of Node, and use what they recommend.
+      // For the current Node version, I followed
+      // https://stackoverflow.com/questions/59787574/typescript-tsconfig-settings-for-node-js-12
+      "target": "es2019",
+      // In `lib` we add `dom`, to tell tsc it's okay to use the URL object (which is in Node >= 7)
+      "lib": ["es2020", "dom"]
   },
   "include": [
       "./src/**/*"