Update custom resolver to consider package exports

Author: aduth

.eslintrc.js

@@ -137,6 +137,7 @@ module.exports = {
 		jsdoc: {
 			mode: 'typescript',
 		},
+		'import/resolver': require.resolve( './tools/eslint/import-resolver' ),
 	},
 	rules: {
 		'jest/expect-expect': 'off',

packages/react-native-editor/.eslintrc.js

@@ -14,6 +14,9 @@ module.exports = {
 			version: 'detect',
 			flowVersion: '0.92.0',
 		},
+		'import/resolver': require.resolve(
+			'../../tools/eslint/import-resolver'
+		),
 	},
 	rules: {
 		'no-restricted-syntax': [

platform-docs/.eslintrc.js

@@ -8,6 +8,7 @@ module.exports = {
 			version: 'detect',
 			flowVersion: '0.92.0',
 		},
+		'import/resolver': require.resolve( '../tools/eslint/import-resolver' ),
 	},
 	overrides: [
 		{

tools/eslint/import-resolver.js

@@ -0,0 +1,44 @@
+/**
+ * External dependencies
+ */
+const resolverNode = require( 'eslint-import-resolver-typescript' );
+const path = require( 'path' );
+const fs = require( 'fs' );
+const PACKAGES_DIR = path.resolve( __dirname, '../../packages' );
+
+exports.interfaceVersion = 2;
+
+exports.resolve = function ( source, file, config ) {
+	const resolve = ( sourcePath ) =>
+		resolverNode.resolve( sourcePath, file, {
+			...config,
+			extensions: [ '.tsx', '.ts', '.mjs', '.js', '.json', '.node' ],
+		} );
+
+	if ( source.startsWith( '@wordpress/' ) ) {
+		const [ , packageName, ...pathParts ] = source.split( '/' );
+		const subpath = path.join( '.', pathParts.join( '/' ) );
+
+		// Consider whether the package is local to the project. If it's not,
+		// use the default resolution behavior.
+		const packagePath = path.join( PACKAGES_DIR, packageName );
+		if ( ! fs.existsSync( packagePath ) ) {
+			return resolve( source );
+		}
+
+		// For all local packages, ensure that we can resolve the requested
+		// source file using its declared exports.
+		try {
+			const manifestPath = path.join( packagePath, 'package.json' );
+			const manifest = require( manifestPath );
+			const exportPath = manifest.exports?.[ subpath ]?.import;
+			const sourcePath = exportPath.replace( 'build-module', 'src' );
+
+			return resolve( path.join( packagePath, sourcePath ) );
+		} catch {
+			return { found: false };
+		}
+	}
+
+	return resolve( source );
+};