transfer-out: transfer out

scripts/lib/eslint-plugin.ts

@@ -0,0 +1,62 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+
+// eslint plugins can't use esm
+const { ESLintUtils } =
+	require('@typescript-eslint/utils') as typeof import('@typescript-eslint/utils')
+const { SymbolFlags } = require('typescript') as typeof import('typescript')
+
+exports.rules = {
+	'no-export-star': ESLintUtils.RuleCreator.withoutDocs({
+		create(context) {
+			return {
+				ExportAllDeclaration(node) {
+					if (node.exported !== null) {
+						// we're exporting a specific name, so that's OK!
+						return
+					}
+
+					// 1. Grab the TypeScript program from parser services
+					const parserServices = ESLintUtils.getParserServices(context)
+					const checker = parserServices.program.getTypeChecker()
+
+					// 2. Find the backing TS node for the ES node, then the symbol for the imported file
+					const originalNode = parserServices.esTreeNodeToTSNodeMap.get(node)
+					const importedFileSymbol = checker.getSymbolAtLocation(originalNode.moduleSpecifier!)!
+
+					// 3. Find all the imported names from the file
+					const importedNames = checker.getExportsOfModule(importedFileSymbol).map((imported) => ({
+						name: imported.getEscapedName(),
+						isType: !(imported.flags & SymbolFlags.Value),
+					}))
+
+					// report the error and offer a fix (listing imported names)
+					context.report({
+						messageId: 'named',
+						node,
+						fix: (fixer) => {
+							return fixer.replaceText(
+								node,
+								[
+									'export {',
+									...importedNames.map(
+										(imported) => `  ${imported.isType ? 'type ' : ''}${imported.name},`
+									),
+									`} from ${JSON.stringify(node.source.value)};`,
+								].join('\n')
+							)
+						},
+					})
+				},
+			}
+		},
+		meta: {
+			messages: {
+				named: 'Use specific named exports instead of export *',
+			},
+			type: 'suggestion',
+			schema: [],
+			fixable: 'code',
+		},
+		defaultOptions: [],
+	}),
+}