Add "version" string and parsed "versionInfo"

package.json

@@ -33,7 +33,8 @@
     "check": "flow check",
     "check-cover": "flow batch-coverage --quiet --strip-root --show-all src/ && flow stop --quiet",
     "build": "node resources/build.js",
-    "preversion": ". ./resources/checkgit.sh && npm test",
+    "preversion": ". ./resources/checkgit.sh",
+    "version": "node resources/gen-version.js && npm test",
     "prepublishOnly": ". ./resources/prepublish.sh",
     "gitpublish": ". ./resources/gitpublish.sh"
   },

resources/build.js

@@ -18,6 +18,7 @@ const {
   rmdirRecursive,
   mkdirRecursive,
   readdirRecursive,
+  parseSemver,
 } = require('./utils');
 
 if (require.main === module) {
@@ -26,14 +27,21 @@ if (require.main === module) {
 
   copyFile('./LICENSE', './dist/LICENSE');
   copyFile('./README.md', './dist/README.md');
-  writeFile('./dist/package.json', buildPackageJSON());
 
   const srcFiles = readdirRecursive('./src', { ignoreDir: /^__.*__$/ });
   for (const filepath of srcFiles) {
     if (filepath.endsWith('.js')) {
       buildJSFile(filepath);
     }
   }
+
+  const packageJSON = buildPackageJSON();
+  assert(
+    packageJSON.version === require('../dist/version').version,
+    'Version in package.json and version.js should match',
+  );
+
+  writeFile('./dist/package.json', packageJSON);
 }
 
 function buildJSFile(filepath) {
@@ -52,13 +60,14 @@ function buildPackageJSON() {
   delete packageJSON.scripts;
   delete packageJSON.devDependencies;
 
-  const { version } = packageJSON;
-  const match = /^[0-9]+\.[0-9]+\.[0-9]+-?([^.]*)/.exec(version);
-  assert(match, 'Version does not match semver spec.');
-  const tag = match[1];
-  assert(!tag || tag === 'rc', 'Only "rc" tag is supported.');
+  const { preReleaseTag } = parseSemver(packageJSON.version);
+  if (preReleaseTag != null) {
+    const [tag] = preReleaseTag.split('.');
+    assert(tag === 'rc', 'Only "rc" tag is supported.');
+
+    assert(!packageJSON.publishConfig, 'Can not override "publishConfig".');
+    packageJSON.publishConfig = { tag: tag || 'latest' };
+  }
 
-  assert(!packageJSON.publishConfig, 'Can not override "publishConfig".');
-  packageJSON.publishConfig = { tag: tag || 'latest' };
   return JSON.stringify(packageJSON, null, 2);
 }

resources/gen-version.js

@@ -0,0 +1,48 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @noflow
+ */
+
+'use strict';
+
+const { version } = require('../package.json');
+const { writeFile, parseSemver } = require('./utils');
+
+const versionInfo = parseSemver(version);
+const body = `/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ */
+
+/**
+ * Note: This file is autogenerated using "resources/gen-version.js" script and
+ * automatically updated by "yarn version" command.
+ */
+
+/**
+ * A string containing the version of the GraphQL.js library
+ */
+export const version = '${version}';
+
+/**
+ * An object containing the components of the GraphQL.js version string
+ */
+export const versionInfo = Object.freeze({
+  major: ${versionInfo.major},
+  minor: ${versionInfo.minor},
+  patch: ${versionInfo.patch},
+  preReleaseTag: ${JSON.stringify(versionInfo.preReleaseTag || null)},
+});
+`;
+
+if (require.main === module) {
+  writeFile('./src/version.js', body);
+}

resources/utils.js

@@ -61,10 +61,21 @@ function copyFile(srcPath, destPath) {
   fs.copyFileSync(srcPath, destPath);
 }
 
+function parseSemver(version) {
+  const match = /^(\d+)\.(\d+)\.(\d+)-?(.*)?$/.exec(version);
+  if (!match) {
+    throw new Error('Version does not match semver spec: ' + version);
+  }
+
+  const [, major, minor, patch, preReleaseTag] = match;
+  return { major, minor, patch, preReleaseTag };
+}
+
 module.exports = {
   copyFile,
   writeFile,
   rmdirRecursive,
   mkdirRecursive,
   readdirRecursive,
+  parseSemver,
 };

src/__tests__/version-test.js

@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ */
+
+import { expect } from 'chai';
+import { describe, it } from 'mocha';
+import { version, versionInfo } from '../version';
+
+describe('Version', () => {
+  it('version', () => {
+    expect(version).to.be.a('string');
+    expect(version).to.match(/^\d+\.\d+\.\d(-rc.\d+)?$/);
+  });
+
+  it('versionInfo', () => {
+    expect(versionInfo).to.be.an('object');
+    expect(versionInfo).to.have.all.keys(
+      'major',
+      'minor',
+      'patch',
+      'preReleaseTag',
+    );
+
+    const { major, minor, patch, preReleaseTag } = versionInfo;
+
+    expect(major).to.be.a('number');
+    expect(minor).to.be.a('number');
+    expect(patch).to.be.a('number');
+    if (preReleaseTag !== null) {
+      expect(preReleaseTag).to.be.a('string');
+    }
+
+    expect(
+      `${major}.${minor}.${patch}` +
+        (preReleaseTag !== null ? '-' + preReleaseTag : ''),
+    ).to.equal(version);
+  });
+});

src/index.js

@@ -31,6 +31,9 @@
  *     import { parse } from 'graphql/language';
  */
 
+// The GraphQL.js version info.
+export { version, versionInfo } from './version';
+
 // The primary entry point into fulfilling a GraphQL request.
 export type { GraphQLArgs } from './graphql';
 export { graphql, graphqlSync } from './graphql';

src/version.js

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ */
+
+/**
+ * Note: This file is autogenerated using "resources/gen-version.js" script and
+ * automatically updated by "yarn version" command.
+ */
+
+/**
+ * A string containing the version of the GraphQL.js library
+ */
+export const version = '14.3.0';
+
+/**
+ * An object containing the components of the GraphQL.js version string
+ */
+export const versionInfo = Object.freeze({
+  major: 14,
+  minor: 3,
+  patch: 0,
+  preReleaseTag: null,
+});