update readme for v4 and remove semver for version feature flags (#3148)

* update readme to include v4

* use version module instead of semver to match library version

README.md

@@ -1,6 +1,7 @@
 # `dd-trace`: Node.js APM Tracer Library
 
-[![npm v3](https://img.shields.io/npm/v/dd-trace/latest?color=blue&label=dd-trace%40v3&logo=npm)](https://www.npmjs.com/package/dd-trace)
+[![npm v4](https://img.shields.io/npm/v/dd-trace/latest?color=blue&label=dd-trace%40v4&logo=npm)](https://www.npmjs.com/package/dd-trace)
+[![npm v3](https://img.shields.io/npm/v/dd-trace/latest-node14?color=blue&label=dd-trace%40v3&logo=npm)](https://www.npmjs.com/package/dd-trace/v/latest-node12)
 [![npm v2](https://img.shields.io/npm/v/dd-trace/latest-node12?color=blue&label=dd-trace%40v2&logo=npm)](https://www.npmjs.com/package/dd-trace/v/latest-node12)
 [![npm dev](https://img.shields.io/npm/v/dd-trace/dev?color=orange&label=dd-trace%40dev&logo=npm)](https://www.npmjs.com/package/dd-trace/v/dev)
 [![codecov](https://codecov.io/gh/DataDog/dd-trace-js/branch/master/graph/badge.svg)](https://codecov.io/gh/DataDog/dd-trace-js)
@@ -28,27 +29,28 @@ Most of the documentation for `dd-trace` is available on these webpages:
 | :---:                                                    | :---:                                                                                                  | :---:    | :---:           | :---:          | :---:       |
 | [`v1`](https://github.com/DataDog/dd-trace-js/tree/v1.x) | ![npm v1](https://img.shields.io/npm/v/dd-trace/legacy-v1?color=white&label=%20&style=flat-square)     | `>= v12` | **End of Life** | 2021-07-13     | 2022-02-25  |
 | [`v2`](https://github.com/DataDog/dd-trace-js/tree/v2.x) | ![npm v2](https://img.shields.io/npm/v/dd-trace/latest-node12?color=white&label=%20&style=flat-square) | `>= v12` | **Maintenance** | 2022-01-28     | 2023-08-15  |
-| [`v3`](https://github.com/DataDog/dd-trace-js/tree/v3.x) | ![npm v3](https://img.shields.io/npm/v/dd-trace/latest?color=white&label=%20&style=flat-square)        | `>= v14` | **Current**     | 2022-08-15     | Unknown     |
+| [`v3`](https://github.com/DataDog/dd-trace-js/tree/v3.x) | ![npm v3](https://img.shields.io/npm/v/dd-trace/latest-node14?color=white&label=%20&style=flat-square) | `>= v14` | **Maintenance** | 2022-08-15     | 2024-05-15  |
+| [`v4`](https://github.com/DataDog/dd-trace-js/tree/v4.x) | ![npm v4](https://img.shields.io/npm/v/dd-trace/latest?color=white&label=%20&style=flat-square)        | `>= v16` | **Current**     | 2023-05-12     | Unknown     |
 
-We currently maintain two release lines, namely `v2` and `v3`.
-Features and bug fixes that are merged are released to the `v3` line and, if appropriate, also the `v2` line.
+We currently maintain three release lines, namely `v2`, `v3` and `v4`.
+Features and bug fixes that are merged are released to the `v4` line and, if appropriate, also the `v2` and `v3` line.
 
-For any new projects it is recommended to use the `v3` release line:
+For any new projects it is recommended to use the `v4` release line:
 
 ```sh
 $ npm install dd-trace
 $ yarn add dd-trace
 ```
 
-However, existing projects that already use the `v2` release line, or projects that need to support Node.js v12, may use the `v2` release line.
+However, existing projects that already use the `v2` or `v3` release lines, or projects that need to support EOL versions of Node.js, may continue to use these release lines.
 This is done by specifying the version when installing the package.
-Note that we also publish to npm using a `latest-node12` tag that can also be used for install:
+Note that we also publish to npm using a `latest-node12` and `latest-node14` tag that can also be used for install:
 
 ```sh
-$ npm install dd-trace@2
-$ yarn add dd-trace@2
-$ npm install dd-trace@latest-node12
-$ yarn add dd-trace@latest-node12
+$ npm install dd-trace@3
+$ yarn add dd-trace@3
+$ npm install dd-trace@latest-node14
+$ yarn add dd-trace@latest-node14
 ```
 
 Any backwards-breaking functionality that is introduced into the library will result in an increase of the major version of the library and therefore a new release line.

packages/datadog-instrumentations/src/jest.js

@@ -1,10 +1,8 @@
 'use strict'
-const semver = require('semver')
 
 const { addHook, channel, AsyncResource } = require('./helpers/instrument')
 const shimmer = require('../../datadog-shimmer')
 const log = require('../../dd-trace/src/log')
-const { version: ddTraceVersion } = require('../../../package.json')
 const {
   getCoveredFilenamesFromCoverage,
   JEST_WORKER_TRACE_PAYLOAD_CODE,
@@ -18,6 +16,7 @@ const {
   getJestTestName,
   getJestSuitesToRun
 } = require('../../datadog-plugin-jest/src/util')
+const { DD_MAJOR } = require('../../../version')
 
 const testSessionStartCh = channel('ci:jest:session:start')
 const testSessionFinishCh = channel('ci:jest:session:finish')
@@ -481,7 +480,7 @@ function jasmineAsyncInstallWraper (jasmineAsyncInstallExport, jestVersion) {
   }
 }
 
-if (semver.lt(ddTraceVersion, '4.0.0')) {
+if (DD_MAJOR < 4) {
   addHook({
     name: 'jest-jasmine2',
     versions: ['>=24.8.0'],

packages/datadog-instrumentations/src/next.js

@@ -4,7 +4,7 @@
 
 const { channel, addHook, AsyncResource } = require('./helpers/instrument')
 const shimmer = require('../../datadog-shimmer')
-const { MAJOR } = require('../../../version')
+const { DD_MAJOR } = require('../../../version')
 
 const startChannel = channel('apm:next:request:start')
 const finishChannel = channel('apm:next:request:finish')
@@ -171,7 +171,7 @@ addHook({ name: 'next', versions: ['>=11.1 <13.2'], file: 'dist/server/next-serv
 
 addHook({
   name: 'next',
-  versions: MAJOR >= 4 ? ['>=10.2 <11.1'] : ['>=9.5 <11.1'],
+  versions: DD_MAJOR >= 4 ? ['>=10.2 <11.1'] : ['>=9.5 <11.1'],
   file: 'dist/next-server/server/next-server.js'
 }, nextServer => {
   const Server = nextServer.default

packages/datadog-plugin-jest/test/jasmine2.spec.js

@@ -1,8 +1,6 @@
 'use strict'
 const fs = require('fs')
 const path = require('path')
-
-const semver = require('semver')
 const nock = require('nock')
 
 const { ORIGIN_KEY, COMPONENT, ERROR_MESSAGE } = require('../../dd-trace/src/constants')
@@ -22,8 +20,9 @@ const {
 } = require('../../dd-trace/src/plugins/util/test')
 
 const { version: ddTraceVersion } = require('../../../package.json')
+const { DD_MAJOR } = require('../../../version')
 
-const describeFunction = semver.lt(ddTraceVersion, '4.0.0') ? describe : describe.skip
+const describeFunction = DD_MAJOR < 4 ? describe : describe.skip
 
 describeFunction('Plugin', function () {
   this.retries(2)

packages/datadog-plugin-next/test/index.spec.js

@@ -8,15 +8,15 @@ const { execSync, spawn } = require('child_process')
 const agent = require('../../dd-trace/test/plugins/agent')
 const { writeFileSync } = require('fs')
 const { satisfies } = require('semver')
-const { MAJOR } = require('../../../version')
+const { DD_MAJOR } = require('../../../version')
 
 describe('Plugin', function () {
   let server
   let port
 
   describe('next', () => {
     // TODO: Figure out why 10.x tests are failing.
-    withVersions('next', 'next', MAJOR >= 4 && '>=11', version => {
+    withVersions('next', 'next', DD_MAJOR >= 4 && '>=11', version => {
       const startServer = withConfig => {
         before(async () => {
           port = await getPort()

packages/dd-trace/src/tracer.js

@@ -7,7 +7,7 @@ const { storage } = require('../../datadog-core')
 const { isError } = require('./util')
 const { setStartupLogConfig } = require('./startup-log')
 const { ERROR_MESSAGE, ERROR_TYPE, ERROR_STACK } = require('../../dd-trace/src/constants')
-const { MAJOR } = require('../../../version')
+const { DD_MAJOR } = require('../../../version')
 
 const SPAN_TYPE = tags.SPAN_TYPE
 const RESOURCE_NAME = tags.RESOURCE_NAME
@@ -27,7 +27,7 @@ class DatadogTracer extends Tracer {
       childOf: this.scope().active()
     }, options)
 
-    if (!options.childOf && options.orphanable === false && MAJOR < 4) {
+    if (!options.childOf && options.orphanable === false && DD_MAJOR < 4) {
       return fn(null, () => {})
     }
 
@@ -82,7 +82,7 @@ class DatadogTracer extends Tracer {
         optionsObj = optionsObj.apply(this, arguments)
       }
 
-      if (optionsObj && optionsObj.orphanable === false && !tracer.scope().active() && MAJOR < 4) {
+      if (optionsObj && optionsObj.orphanable === false && !tracer.scope().active() && DD_MAJOR < 4) {
         return fn.apply(this, arguments)
       }
 

packages/dd-trace/test/tracer.spec.js

@@ -8,13 +8,13 @@ const Config = require('../src/config')
 const tags = require('../../../ext/tags')
 const { expect } = require('chai')
 const { ERROR_MESSAGE, ERROR_TYPE, ERROR_STACK } = require('../../dd-trace/src/constants')
-const { MAJOR } = require('../../../version')
+const { DD_MAJOR } = require('../../../version')
 
 const SPAN_TYPE = tags.SPAN_TYPE
 const RESOURCE_NAME = tags.RESOURCE_NAME
 const SERVICE_NAME = tags.SERVICE_NAME
 
-const describeOrphanable = MAJOR < 4 ? describe : describe.skip
+const describeOrphanable = DD_MAJOR < 4 ? describe : describe.skip
 
 describe('Tracer', () => {
   let Tracer

version.js

@@ -1,9 +1,13 @@
 'use strict'
 
-const matches = require('./package.json').version.match(/^(\d+)\.(\d+)\.(\d+)/)
+const ddMatches = require('./package.json').version.match(/^(\d+)\.(\d+)\.(\d+)/)
+const nodeMatches = process.versions.node.match(/^(\d+)\.(\d+)\.(\d+)/)
 
 module.exports = {
-  MAJOR: parseInt(matches[1]),
-  MINOR: parseInt(matches[2]),
-  PATCH: parseInt(matches[3])
+  DD_MAJOR: parseInt(ddMatches[1]),
+  DD_MINOR: parseInt(ddMatches[2]),
+  DD_PATCH: parseInt(ddMatches[3]),
+  NODE_MAJOR: parseInt(nodeMatches[1]),
+  NODE_MINOR: parseInt(nodeMatches[2]),
+  NODE_PATCH: parseInt(nodeMatches[3])
 }