Release Tooling: Read the npm v12 JSON output shapes

tools/release/commands/packages.js

@@ -723,21 +723,24 @@ function isNpmPackageVersionMissing( error ) {
 }
 
 /**
- * Parses npm JSON command output.
+ * Parses npm JSON command output for a single package.
  *
  * @param {string} output      Command stdout.
  * @param {string} description Output description for error messages.
  *
  * @return {*} Parsed JSON output.
  */
 function parseNpmJsonOutput( output, description ) {
+	let parsed;
 	try {
-		return JSON.parse( output );
+		parsed = JSON.parse( output );
 	} catch {
 		throw new Error(
 			`Unable to parse npm registry ${ description }: ${ output }`
 		);
 	}
+	/* npm v12 always wraps `view --json` in an array; older versions return the object. */
+	return Array.isArray( parsed ) ? parsed[ 0 ] : parsed;
 }
 
 /**

tools/release/commands/test/packages.js

@@ -549,30 +549,40 @@ describe( 'runNpmPublishPreflight', () => {
 		expect( console ).toHaveLogged();
 	} );
 
-	it( 'accepts a published version from the prepared commit with the expected dist-tag', async () => {
-		const commandFn = vi
-			.fn()
-			.mockResolvedValueOnce( WHOAMI )
-			.mockResolvedValueOnce( {
-				stdout: '{"version":"4.50.0","gitHead":"publish-sha","dist-tags":{"latest":"4.50.0"}}',
-			} );
+	it.each( [
+		[
+			'an object, as npm v11 returns',
+			'{"version":"4.50.0","gitHead":"publish-sha","dist-tags":{"latest":"4.50.0"}}',
+		],
+		[
+			'an array, as npm v12 returns',
+			'[{"version":"4.50.0","gitHead":"publish-sha","dist-tags":{"latest":"4.50.0"}}]',
+		],
+	] )(
+		'accepts a published version from the prepared commit with the expected dist-tag when npm view returns %s',
+		async ( _description, stdout ) => {
+			const commandFn = vi
+				.fn()
+				.mockResolvedValueOnce( WHOAMI )
+				.mockResolvedValueOnce( { stdout } );
 
-		await expect(
-			runNpmPublishPreflight(
-				{
-					distTag: 'latest',
-					gitWorkingDirectoryPath: '/repo',
-					publishCommit: 'publish-sha',
-					releasePackages: [
-						{ name: '@wordpress/a11y', version: '4.50.0' },
-					],
-				},
-				{ commandFn }
-			)
-		).resolves.toEqual( [ '@wordpress/a11y' ] );
-		expect( commandFn ).toHaveBeenCalledTimes( 2 );
-		expect( console ).toHaveLogged();
-	} );
+			await expect(
+				runNpmPublishPreflight(
+					{
+						distTag: 'latest',
+						gitWorkingDirectoryPath: '/repo',
+						publishCommit: 'publish-sha',
+						releasePackages: [
+							{ name: '@wordpress/a11y', version: '4.50.0' },
+						],
+					},
+					{ commandFn }
+				)
+			).resolves.toEqual( [ '@wordpress/a11y' ] );
+			expect( commandFn ).toHaveBeenCalledTimes( 2 );
+			expect( console ).toHaveLogged();
+		}
+	);
 
 	it( 'fails when a published version came from another commit', async () => {
 		const commandFn = vi

tools/validation/test-vitest-consumers.mjs

@@ -118,7 +118,11 @@ function pack( name ) {
 			directory
 		)
 	);
-	return `file:${ path.join( directory, output[ 0 ].filename ) }`;
+	/* npm v12 keys `pack --json` output by package name; older versions return an array. */
+	const [ packed ] = Array.isArray( output )
+		? output
+		: Object.values( output );
+	return `file:${ path.join( directory, packed.filename ) }`;
 }
 const scripts = values.scripts ?? pack( 'scripts' );
 const eslintPlugin = values[ 'eslint-plugin' ] ?? pack( 'eslint-plugin' );