1 files changed, 125 insertions, 0 deletions
diff --git a/node_modules/rollup-pluginutils/src/attachScopes.ts b/node_modules/rollup-pluginutils/src/attachScopes.ts
new file mode 100644
index 0000000..0809039
--- /dev/null
+++ b/node_modules/rollup-pluginutils/src/attachScopes.ts
@@ -0,0 +1,125 @@
+import { Node, walk } from 'estree-walker';
+import extractAssignedNames from './extractAssignedNames';
+import { AttachedScope, AttachScopes } from './pluginutils';
+
+const blockDeclarations = {
+	const: true,
+	let: true
+};
+
+interface ScopeOptions {
+	parent?: AttachedScope;
+	block?: boolean;
+	params?: Array<Node>;
+}
+
+class Scope implements AttachedScope {
+	parent?: AttachedScope;
+	isBlockScope: boolean;
+	declarations: { [key: string]: boolean };
+
+	constructor(options: ScopeOptions = {}) {
+		this.parent = options.parent;
+		this.isBlockScope = !!options.block;
+
+		this.declarations = Object.create(null);
+
+		if (options.params) {
+			options.params.forEach(param => {
+				extractAssignedNames(param).forEach(name => {
+					this.declarations[name] = true;
+				});
+			});
+		}
+	}
+
+	addDeclaration(node: Node, isBlockDeclaration: boolean, isVar: boolean): void {
+		if (!isBlockDeclaration && this.isBlockScope) {
+			// it's a `var` or function node, and this
+			// is a block scope, so we need to go up
+			this.parent!.addDeclaration(node, isBlockDeclaration, isVar);
+		} else if (node.id) {
+			extractAssignedNames(node.id).forEach(name => {
+				this.declarations[name] = true;
+			});
+		}
+	}
+
+	contains(name: string): boolean {
+		return this.declarations[name] || (this.parent ? this.parent.contains(name) : false);
+	}
+}
+
+const attachScopes: AttachScopes = function attachScopes(ast, propertyName = 'scope') {
+	let scope = new Scope();
+
+	walk(ast, {
+		enter(node, parent) {
+			// function foo () {...}
+			// class Foo {...}
+			if (/(Function|Class)Declaration/.test(node.type)) {
+				scope.addDeclaration(node, false, false);
+			}
+
+			// var foo = 1
+			if (node.type === 'VariableDeclaration') {
+				const kind: keyof typeof blockDeclarations = node.kind;
+				const isBlockDeclaration = blockDeclarations[kind];
+
+				node.declarations.forEach((declaration: Node) => {
+					scope.addDeclaration(declaration, isBlockDeclaration, true);
+				});
+			}
+
+			let newScope: AttachedScope | undefined;
+
+			// create new function scope
+			if (/Function/.test(node.type)) {
+				newScope = new Scope({
+					parent: scope,
+					block: false,
+					params: node.params
+				});
+
+				// named function expressions - the name is considered
+				// part of the function's scope
+				if (node.type === 'FunctionExpression' && node.id) {
+					newScope.addDeclaration(node, false, false);
+				}
+			}
+
+			// create new block scope
+			if (node.type === 'BlockStatement' && !/Function/.test(parent!.type)) {
+				newScope = new Scope({
+					parent: scope,
+					block: true
+				});
+			}
+
+			// catch clause has its own block scope
+			if (node.type === 'CatchClause') {
+				newScope = new Scope({
+					parent: scope,
+					params: node.param ? [node.param] : [],
+					block: true
+				});
+			}
+
+			if (newScope) {
+				Object.defineProperty(node, propertyName, {
+					value: newScope,
+					configurable: true
+				});
+
+				scope = newScope;
+			}
+		},
+		leave(node) {
+			if (node[propertyName]) scope = scope.parent!;
+		}
+	});
+
+	return scope;
+};
+
+export { attachScopes as default };