build: set minimum runtime Node.js version to 12.20.0

Node.js =12.20.0 added support for exports field.
Node.js =12.19.0 added support for imports field.

Both of these fields are used by integrated ApiDOM.

Jest@29.3.0 doesn't yet support package.json imports
field. Next version will, more info in:
jestjs/jest#12270.

Refs #2744

.github/workflows/nodejs.yml

@@ -61,10 +61,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Use Node.js 12.4.x
+    - name: Use Node.js 12.20.0
       uses: actions/setup-node@v2
       with:
-        node-version: 12.4.x
+        node-version: 12.20.0
         registry-url: https://npm.pkg.github.com/
         scope: "@swagger-api"
     - name: Cache Node Modules
@@ -84,7 +84,7 @@ jobs:
       with:
         name: commonjs
 
-    - name: Run commonjs build artifacts on Node.js 12.4.x
+    - name: Run commonjs build artifacts on Node.js 12.20.0
       run: node -p "require('./commonjs')"
 
     - name: Use Node 14.x

README.md

@@ -51,7 +51,7 @@ Swagger Client Version | Release Date | OpenAPI Spec compatibility | Notes
 
 ### Runtime 
 
-- Node.js `>=` 12.4.x
+- Node.js `>=`12.20.0
 - `swagger-client` works in the latest versions of Chrome, Safari, Firefox, and Edge.
 
 ## Security contact

babel.config.js

@@ -10,7 +10,7 @@ module.exports = {
             corejs: { version: 3 },
             useBuiltIns: false,
             targets: {
-              node: '12.4',
+              node: '12.20.0',
             },
             forceAllTransforms: false,
             ignoreBrowserslistConfig: true,

config/jest/jest.artifact-commonjs.config.js

@@ -4,4 +4,20 @@ module.exports = {
   rootDir: path.join(__dirname, '..', '..'),
   testEnvironment: 'node',
   testMatch: ['**/test/build-artifacts/commonjs.js'],
+  moduleNameMapper: {
+    /**
+     * This is here only until next version of Jest is released - 29.4.x.
+     * Jest doesn't support package.json imports fields now, so we have
+     * to provide this workaround.
+     *
+     * More information in https://github.com/facebook/jest/issues/12270.
+     *
+     */
+    '#buffer':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/buffer/protocol-import.cjs',
+    '#fs':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/fs/protocol-import.cjs',
+    '#util':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/util/protocol-import.cjs',
+  },
 };

config/jest/jest.artifact-es.config.js

@@ -4,4 +4,20 @@ module.exports = {
   rootDir: path.join(__dirname, '..', '..'),
   testEnvironment: 'node',
   testMatch: ['**/test/build-artifacts/es.js'],
+  moduleNameMapper: {
+    /**
+     * This is here only until next version of Jest is released - 29.4.x.
+     * Jest doesn't support package.json imports fields now, so we have
+     * to provide this workaround.
+     *
+     * More information in https://github.com/facebook/jest/issues/12270.
+     *
+     */
+    '#buffer':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/buffer/protocol-import.cjs',
+    '#fs':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/fs/protocol-import.cjs',
+    '#util':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/util/protocol-import.cjs',
+  },
 };

config/jest/jest.unit.config.js

@@ -8,6 +8,20 @@ module.exports = {
   moduleNameMapper: {
     'formdata-node/lib/cjs/fileFromPath.js':
       '<rootDir>/node_modules/formdata-node/lib/cjs/fileFromPath.js',
+    /**
+     * This is here only until next version of Jest is released - 29.4.x.
+     * Jest doesn't support package.json imports fields now, so we have
+     * to provide this workaround.
+     *
+     * More information in https://github.com/facebook/jest/issues/12270.
+     *
+     */
+    '#buffer':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/buffer/protocol-import.cjs',
+    '#fs':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/fs/protocol-import.cjs',
+    '#util':
+      '<rootDir>/node_modules/@swagger-api/apidom-reference/cjs/util/polyfills/util/protocol-import.cjs',
   },
   testPathIgnorePatterns: [
     '<rootDir>/node_modules/',

docs/development/setting-up.md

@@ -3,22 +3,11 @@
 ### Prerequisites
 
 - git, any version
-- NPM >=6.12.x
+- Node.js >=16.16
+- NPM >=8.11.0
 
 Generally, we recommend following guidelines from [Node.js Releases](https://nodejs.org/en/about/releases/) to only use `Current`, `Active LTS` or `Maintenance LTS` releases.
 
-Current Node.js:
-- Node.js 16.x
-- NPM >=7.10.x
-
-Current Node.js Active LTS:
-- Node.js >=14.x
-- NPM >=6.14.x
-
-Current Node.js Maintenance LTS:
-- Node.js >12.4
-- NPM >=6.12.x
-
 ### Steps
 
 1. `git clone https://github.com/swagger-api/swagger-js.git`