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import { walk } from 'estree-walker';
const isNodeInPatternWeakSet = /* @__PURE__ */ new WeakSet();
function setIsNodeInPattern(node) {
return isNodeInPatternWeakSet.add(node);
}
function isNodeInPattern(node) {
return isNodeInPatternWeakSet.has(node);
}
function esmWalker(root, { onIdentifier, onImportMeta, onDynamicImport, onCallExpression }) {
const parentStack = [];
const varKindStack = [];
const scopeMap = /* @__PURE__ */ new WeakMap();
const identifiers = [];
const setScope = (node, name) => {
let scopeIds = scopeMap.get(node);
if (scopeIds && scopeIds.has(name))
return;
if (!scopeIds) {
scopeIds = /* @__PURE__ */ new Set();
scopeMap.set(node, scopeIds);
}
scopeIds.add(name);
};
function isInScope(name, parents) {
return parents.some((node) => {
var _a;
return node && ((_a = scopeMap.get(node)) == null ? void 0 : _a.has(name));
});
}
function handlePattern(p, parentScope) {
if (p.type === "Identifier") {
setScope(parentScope, p.name);
} else if (p.type === "RestElement") {
handlePattern(p.argument, parentScope);
} else if (p.type === "ObjectPattern") {
p.properties.forEach((property) => {
if (property.type === "RestElement")
setScope(parentScope, property.argument.name);
else
handlePattern(property.value, parentScope);
});
} else if (p.type === "ArrayPattern") {
p.elements.forEach((element) => {
if (element)
handlePattern(element, parentScope);
});
} else if (p.type === "AssignmentPattern") {
handlePattern(p.left, parentScope);
} else {
setScope(parentScope, p.name);
}
}
walk(root, {
enter(node, parent) {
if (node.type === "ImportDeclaration")
return this.skip();
if (parent && !(parent.type === "IfStatement" && node === parent.alternate))
parentStack.unshift(parent);
if (node.type === "VariableDeclaration")
varKindStack.unshift(node.kind);
if (node.type === "CallExpression")
onCallExpression == null ? void 0 : onCallExpression(node);
if (node.type === "MetaProperty" && node.meta.name === "import")
onImportMeta == null ? void 0 : onImportMeta(node);
else if (node.type === "ImportExpression")
onDynamicImport == null ? void 0 : onDynamicImport(node);
if (node.type === "Identifier") {
if (!isInScope(node.name, parentStack) && isRefIdentifier(node, parent, parentStack)) {
identifiers.push([node, parentStack.slice(0)]);
}
} else if (isFunctionNode(node)) {
if (node.type === "FunctionDeclaration") {
const parentScope = findParentScope(parentStack);
if (parentScope)
setScope(parentScope, node.id.name);
}
node.params.forEach((p) => {
if (p.type === "ObjectPattern" || p.type === "ArrayPattern") {
handlePattern(p, node);
return;
}
walk(p.type === "AssignmentPattern" ? p.left : p, {
enter(child, parent2) {
if ((parent2 == null ? void 0 : parent2.type) === "AssignmentPattern" && (parent2 == null ? void 0 : parent2.right) === child)
return this.skip();
if (child.type !== "Identifier")
return;
if (isStaticPropertyKey(child, parent2))
return;
if ((parent2 == null ? void 0 : parent2.type) === "TemplateLiteral" && (parent2 == null ? void 0 : parent2.expressions.includes(child)) || (parent2 == null ? void 0 : parent2.type) === "CallExpression" && (parent2 == null ? void 0 : parent2.callee) === child)
return;
setScope(node, child.name);
}
});
});
} else if (node.type === "Property" && parent.type === "ObjectPattern") {
setIsNodeInPattern(node);
} else if (node.type === "VariableDeclarator") {
const parentFunction = findParentScope(
parentStack,
varKindStack[0] === "var"
);
if (parentFunction)
handlePattern(node.id, parentFunction);
} else if (node.type === "CatchClause" && node.param) {
handlePattern(node.param, node);
}
},
leave(node, parent) {
if (parent && !(parent.type === "IfStatement" && node === parent.alternate))
parentStack.shift();
if (node.type === "VariableDeclaration")
varKindStack.shift();
}
});
identifiers.forEach(([node, stack]) => {
if (!isInScope(node.name, stack)) {
const parent = stack[0];
const grandparent = stack[1];
const hasBindingShortcut = isStaticProperty(parent) && parent.shorthand && (!isNodeInPattern(parent) || isInDestructuringAssignment(parent, parentStack));
const classDeclaration = parent.type === "PropertyDefinition" && (grandparent == null ? void 0 : grandparent.type) === "ClassBody" || parent.type === "ClassDeclaration" && node === parent.superClass;
const classExpression = parent.type === "ClassExpression" && node === parent.id;
onIdentifier == null ? void 0 : onIdentifier(node, {
hasBindingShortcut,
classDeclaration,
classExpression
}, stack);
}
});
}
function isRefIdentifier(id, parent, parentStack) {
if (parent.type === "CatchClause" || (parent.type === "VariableDeclarator" || parent.type === "ClassDeclaration") && parent.id === id)
return false;
if (isFunctionNode(parent)) {
if (parent.id === id)
return false;
if (parent.params.includes(id))
return false;
}
if (parent.type === "MethodDefinition" && !parent.computed)
return false;
if (isStaticPropertyKey(id, parent))
return false;
if (isNodeInPattern(parent) && parent.value === id)
return false;
if (parent.type === "ArrayPattern" && !isInDestructuringAssignment(parent, parentStack))
return false;
if (parent.type === "MemberExpression" && parent.property === id && !parent.computed)
return false;
if (parent.type === "ExportSpecifier")
return false;
if (id.name === "arguments")
return false;
return true;
}
function isStaticProperty(node) {
return node && node.type === "Property" && !node.computed;
}
function isStaticPropertyKey(node, parent) {
return isStaticProperty(parent) && parent.key === node;
}
const functionNodeTypeRE = /Function(?:Expression|Declaration)$|Method$/;
function isFunctionNode(node) {
return functionNodeTypeRE.test(node.type);
}
const blockNodeTypeRE = /^BlockStatement$|^For(?:In|Of)?Statement$/;
function isBlock(node) {
return blockNodeTypeRE.test(node.type);
}
function findParentScope(parentStack, isVar = false) {
return parentStack.find(isVar ? isFunctionNode : isBlock);
}
function isInDestructuringAssignment(parent, parentStack) {
if (parent && (parent.type === "Property" || parent.type === "ArrayPattern"))
return parentStack.some((i) => i.type === "AssignmentExpression");
return false;
}
export { esmWalker, isFunctionNode, isInDestructuringAssignment, isNodeInPattern, isStaticProperty, isStaticPropertyKey, setIsNodeInPattern };
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