@linaria/utils - npm Package Compare versions

Comparing version 4.2.3 to 4.2.4

esm/scopeHelpers.js

@@ -83,23 +83,40 @@ /* eslint-disable no-restricted-syntax */
 const deletingNodes = new WeakSet();
-export function findParentForDelete(path) {
+
+const isEmptyList = list => list.length === 0 || list.every(i => deletingNodes.has(i));
+
+const getPathFromAction = action => {
+  if (!Array.isArray(action)) {
+    return action;
+  }
+
+  if (action[0] === 'replace' || action[0] === 'remove') {
+    return action[1];
+  }
+
+  throw new Error(`Unknown action type: ${action[0]}`);
+};
+
+export function findActionForNode(path) {
   if (isRemoved(path)) return null;
   deletingNodes.add(path);
   const parent = path.parentPath;
-  if (!parent) return path;
+  if (!parent) return ['remove', path];
 
   if (parent.isProgram()) {
     // Do not delete Program node
-    return path;
+    return ['remove', path];
   }
 
+  if (parent.isFunction() && path.listKey === 'params') {
+    // Do not remove params of functions
+    return null;
+  }
+
   if (parent.isLogicalExpression({
     operator: '&&'
   })) {
-    mutate(parent, p => {
-      p.replaceWith({
-        type: 'BooleanLiteral',
-        value: false
-      });
-    });
-    return null;
+    return ['replace', parent, {
+      type: 'BooleanLiteral',
+      value: false
+    }];
   }
@@ -117,25 +134,22 @@
       if (maybeDefineProperty?.isCallExpression() && maybeDefineProperty.get('callee').matchesPattern('Object.defineProperty')) {
-        return findParentForDelete(maybeDefineProperty);
+        return findActionForNode(maybeDefineProperty);
       }
     }
 
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
 
   if (parent.isTemplateLiteral()) {
-    mutate(path, p => {
-      p.replaceWith({
-        type: 'StringLiteral',
-        value: ''
-      });
-    });
-    return null;
+    return ['replace', path, {
+      type: 'StringLiteral',
+      value: ''
+    }];
   }
 
   if (parent.isAssignmentExpression()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
 
   if (parent.isCallExpression()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
@@ -146,3 +160,3 @@
   })) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
@@ -153,3 +167,3 @@
   }) || parent.isFunctionDeclaration() || parent.isObjectMethod() || parent.isClassMethod()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
@@ -160,4 +174,4 @@
 
-    if (body.length === 1) {
-      return findParentForDelete(parent);
+    if (isEmptyList(body)) {
+      return findActionForNode(parent);
     }
@@ -172,3 +186,3 @@
           // It's `if (…) return …`, we can remove it.
-          return findParentForDelete(prevStatement);
+          return findActionForNode(prevStatement);
         }
@@ -178,3 +192,3 @@ } else if (body.slice(1).every(statement => deletingNodes.has(statement))) {
         // are marked for deletion, we can remove the whole block.
-        return findParentForDelete(parent);
+        return findActionForNode(parent);
       }
@@ -185,7 +199,7 @@ }
   if (parent.isVariableDeclarator()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
 
-  if (parent.isExportNamedDeclaration() && (parent.node.specifiers.length === 1 && parent.node.specifiers[0] === path.node || parent.node.declaration === path.node)) {
-    return findParentForDelete(parent);
+  if (parent.isExportNamedDeclaration() && (path.key === 'specifiers' && isEmptyList(parent.get('specifiers')) || path.key === 'declaration' && parent.node.declaration === path.node)) {
+    return findActionForNode(parent);
   }
@@ -197,4 +211,4 @@
 
-      if (list.length === 1) {
-        return findParentForDelete(parent);
+      if (isEmptyList(list)) {
+        return findActionForNode(parent);
       }
@@ -205,3 +219,3 @@ }
   if (parent.isTryStatement()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
@@ -214,3 +228,3 @@
       // The parent node isn't valid without this field, so we should remove it also.
-      return findParentForDelete(parent);
+      return findActionForNode(parent);
     }
@@ -221,7 +235,7 @@ }
     if (path.key === key && parent.get(key) === path) {
-      return findParentForDelete(parent);
+      return findActionForNode(parent);
     }
   }
 
-  return path;
+  return ['remove', path];
 } // @babel/preset-typescript transpiles enums, but doesn't reference used identifiers.
@@ -270,3 +284,3 @@
 
-    const forDeleting = [binding.path, ...binding.constantViolations].map(i => findParentForDelete(i)).filter(isNotNull);
+    const forDeleting = [binding.path, ...binding.constantViolations].map(findActionForNode).filter(isNotNull).map(getPathFromAction);
     if (forDeleting.length === 0) return;
@@ -294,20 +308,20 @@ findIdentifiers(forDeleting).forEach(identifier => {
 
-  let clean = false;
-  let referencedIdentifiers = [];
-  const declared = [];
-  paths.forEach(path => {
-    const deletingPath = findParentForDelete(path);
-    if (!deletingPath) return;
-    referencedIdentifiers.push(...findIdentifiers([deletingPath], 'referenced'));
-    declared.push(...findIdentifiers([deletingPath], 'binding').map(i => getScope(i).getBinding(i.node.name)));
-    mutate(deletingPath, p => {
-      if (!isRemoved(p)) p.remove();
+  const actions = paths.map(findActionForNode).filter(isNotNull);
+  const affectedPaths = actions.map(getPathFromAction);
+  let referencedIdentifiers = findIdentifiers(affectedPaths, 'referenced');
+  const referencesOfBinding = findIdentifiers(affectedPaths, 'binding').map(i => (i.node && getScope(i).getBinding(i.node.name)) ?? null).filter(isNotNull).reduce((acc, i) => [...acc, ...i.referencePaths.filter(nonType)], []);
+  actions.forEach(action => {
+    mutate(action[1], p => {
+      if (isRemoved(p)) return;
+
+      if (action[0] === 'remove') {
+        p.remove();
+      } else if (action[0] === 'replace') {
+        p.replaceWith(action[2]);
+      }
     });
   });
-
-  if (declared.length > 0) {
-    removeWithRelated(declared.reduce((acc, i) => [...acc, ...i.referencePaths.filter(nonType)], []));
-  }
-
+  removeWithRelated(referencesOfBinding);
   referencedIdentifiers.sort((a, b) => a.node?.name.localeCompare(b.node?.name));
+  let clean = false;
 
@@ -314,0 +328,0 @@ while (!clean && referencedIdentifiers.length > 0) {

esm/scopeHelpers.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"scopeHelpers.js","names":["NODE_FIELDS","findIdentifiers","nonType","getScope","isNotNull","isRemoved","validateField","node","key","val","field","validate","optional","getBinding","path","binding","name","undefined","reference","referencePath","force","isReferencedIdentifier","referencePaths","includes","referenced","references","push","isReferenced","kind","some","i","find","ancestor","isTSType","isFlowType","dereference","filter","length","dereferenceAll","map","identifierPath","referenceAll","forEach","deletingNodes","WeakSet","findParentForDelete","add","parent","parentPath","isProgram","isLogicalExpression","operator","mutate","p","replaceWith","type","value","isObjectProperty","get","isIdentifier","maybeDefineProperty","isCallExpression","matchesPattern","isTemplateLiteral","isAssignmentExpression","isForInStatement","left","isFunctionExpression","body","isFunctionDeclaration","isObjectMethod","isClassMethod","isBlockStatement","listKey","prevStatement","isIfStatement","isReturnStatement","slice","every","statement","has","isVariableDeclarator","isExportNamedDeclaration","specifiers","declaration","list","isTryStatement","referenceEnums","program","traverse","ExpressionStatement","expressionStatement","expression","callee","args","arg","fixed","removeUnreferenced","items","Set","item","hasReferences","forDeleting","constantViolations","identifier","removeWithRelated","result","sort","a","b","localeCompare","paths","rootPath","getProgramParent","clean","referencedIdentifiers","declared","deletingPath","remove","reduce","acc","join","fn","dereferenced","mutated","dead","assignments","assignment","scope","Object","values","getOuterBindingIdentifiers","Identifier","isArrayPattern","elements"],"sources":["../src/scopeHelpers.ts"],"sourcesContent":["/* eslint-disable no-restricted-syntax */\n/* eslint @typescript-eslint/no-use-before-define: [\"error\", { \"functions\": false }] */\n\nimport type { Binding, NodePath } from '@babel/traverse';\nimport type {\n  Node,\n  Identifier,\n  JSXIdentifier,\n  Program,\n  FieldOptions,\n} from '@babel/types';\nimport { NODE_FIELDS } from '@babel/types';\n\nimport findIdentifiers, { nonType } from './findIdentifiers';\nimport { getScope } from './getScope';\nimport isNotNull from './isNotNull';\nimport isRemoved from './isRemoved';\n\nfunction validateField(\n  node: Node,\n  key: string,\n  val: unknown,\n  field: FieldOptions\n) {\n  if (!(field != null && field.validate)) return true;\n  if (field.optional && val == null) return true;\n  try {\n    field.validate(node, key, val);\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction getBinding(path: NodePath<Identifier | JSXIdentifier>) {\n  const binding = getScope(path).getBinding(path.node.name);\n  if (!binding) {\n    return undefined;\n  }\n\n  return binding;\n}\n\nexport function reference(\n  path: NodePath<Identifier | JSXIdentifier>,\n  referencePath: NodePath = path,\n  force = false\n): void {\n  if (!force && !path.isReferencedIdentifier()) return;\n\n  const binding = getBinding(path);\n  if (!binding) return;\n\n  if (binding.referencePaths.includes(referencePath)) {\n    return;\n  }\n\n  binding.referenced = true;\n  binding.references += 1;\n  binding.referencePaths.push(referencePath ?? path);\n}\n\nfunction isReferenced(binding: Binding) {\n  if (!binding.referenced) {\n    return false;\n  }\n\n  // If it's a param binding, we can't just remove it\n  // because it brakes the function signature. Keep it alive for now.\n  if ((binding.kind as string) === 'param') {\n    return true;\n  }\n\n  // If all remaining references are in TS/Flow types, binding is unreferenced\n  return binding.referencePaths.some(\n    (i) => !i.find((ancestor) => ancestor.isTSType() || ancestor.isFlowType())\n  );\n}\n\nexport function dereference(\n  path: NodePath<Identifier | JSXIdentifier>\n): Binding | null {\n  const binding = getBinding(path);\n  if (!binding) return null;\n\n  if (!binding.referencePaths.includes(path)) {\n    return null;\n  }\n\n  binding.references -= 1;\n  binding.referencePaths = binding.referencePaths.filter((i) => i !== path);\n  binding.referenced = binding.referencePaths.length > 0;\n\n  return binding;\n}\n\nfunction dereferenceAll(path: NodePath): Binding[] {\n  return findIdentifiers([path])\n    .map((identifierPath) => dereference(identifierPath))\n    .filter(isNotNull);\n}\n\nexport function referenceAll(path: NodePath): void {\n  findIdentifiers([path]).forEach((identifierPath) =>\n    reference(identifierPath)\n  );\n}\n\nconst deletingNodes = new WeakSet<NodePath>();\n\nexport function findParentForDelete(path: NodePath): NodePath | null {\n  if (isRemoved(path)) return null;\n\n  deletingNodes.add(path);\n\n  const parent = path.parentPath;\n\n  if (!parent) return path;\n\n  if (parent.isProgram()) {\n    // Do not delete Program node\n    return path;\n  }\n\n  if (parent.isLogicalExpression({ operator: '&&' })) {\n    mutate(parent, (p) => {\n      p.replaceWith({\n        type: 'BooleanLiteral',\n        value: false,\n      });\n    });\n\n    return null;\n  }\n\n  if (parent.isObjectProperty()) {\n    // let's check if it is a special case with Object.defineProperty\n    const key = parent.get('key');\n    if (key.isIdentifier({ name: 'get' })) {\n      const maybeDefineProperty = parent.parentPath.parentPath;\n      if (\n        maybeDefineProperty?.isCallExpression() &&\n        maybeDefineProperty\n          .get('callee')\n          .matchesPattern('Object.defineProperty')\n      ) {\n        return findParentForDelete(maybeDefineProperty);\n      }\n    }\n\n    return findParentForDelete(parent);\n  }\n\n  if (parent.isTemplateLiteral()) {\n    mutate(path, (p) => {\n      p.replaceWith({\n        type: 'StringLiteral',\n        value: '',\n      });\n    });\n    return null;\n  }\n\n  if (parent.isAssignmentExpression()) {\n    return findParentForDelete(parent);\n  }\n\n  if (parent.isCallExpression()) {\n    return findParentForDelete(parent);\n  }\n\n  if (parent.isForInStatement({ left: path.node })) {\n    return findParentForDelete(parent);\n  }\n\n  if (\n    parent.isFunctionExpression({ body: path.node }) ||\n    parent.isFunctionDeclaration() ||\n    parent.isObjectMethod() ||\n    parent.isClassMethod()\n  ) {\n    return findParentForDelete(parent);\n  }\n\n  if (parent.isBlockStatement()) {\n    const body = parent.get('body');\n    if (body.length === 1) {\n      return findParentForDelete(parent);\n    }\n\n    if (path.listKey === 'body' && typeof path.key === 'number') {\n      if (path.key > 0) {\n        // We can check whether the previous one can be removed\n        const prevStatement = body[path.key - 1];\n        if (\n          prevStatement.isIfStatement() &&\n          prevStatement.get('consequent').isReturnStatement()\n        ) {\n          // It's `if (…) return …`, we can remove it.\n          return findParentForDelete(prevStatement);\n        }\n      } else if (\n        body.slice(1).every((statement) => deletingNodes.has(statement))\n      ) {\n        // If it is the first statement and all other statements\n        // are marked for deletion, we can remove the whole block.\n        return findParentForDelete(parent);\n      }\n    }\n  }\n\n  if (parent.isVariableDeclarator()) {\n    return findParentForDelete(parent);\n  }\n\n  if (\n    parent.isExportNamedDeclaration() &&\n    ((parent.node.specifiers.length === 1 &&\n      parent.node.specifiers[0] === path.node) ||\n      parent.node.declaration === path.node)\n  ) {\n    return findParentForDelete(parent);\n  }\n\n  for (const key of ['body', 'declarations', 'specifiers']) {\n    if (path.listKey === key && typeof path.key === 'number') {\n      const list = parent.get(key) as NodePath[];\n      if (list.length === 1) {\n        return findParentForDelete(parent);\n      }\n    }\n  }\n\n  if (parent.isTryStatement()) {\n    return findParentForDelete(parent);\n  }\n\n  if (!path.listKey) {\n    const field = NODE_FIELDS[parent.type][path.key];\n    if (!validateField(parent.node, path.key as string, null, field)) {\n      // The parent node isn't valid without this field, so we should remove it also.\n      return findParentForDelete(parent);\n    }\n  }\n\n  for (const key of [\n    'argument',\n    'block',\n    'body',\n    'callee',\n    'discriminant',\n    'expression',\n    'id',\n    'left',\n    'object',\n    'property',\n    'right',\n    'test',\n  ]) {\n    if (path.key === key && parent.get(key) === path) {\n      return findParentForDelete(parent);\n    }\n  }\n\n  return path;\n}\n\n// @babel/preset-typescript transpiles enums, but doesn't reference used identifiers.\nfunction referenceEnums(program: NodePath<Program>) {\n  /*\n   * We are looking for transpiled enums.\n   *   (function (Colors) {\n   *     Colors[\"BLUE\"] = \"#27509A\";\n   *   })(Colors || (Colors = {}));\n   */\n  program.traverse({\n    ExpressionStatement(expressionStatement) {\n      const expression = expressionStatement.get('expression');\n      if (!expression.isCallExpression()) return;\n\n      const callee = expression.get('callee');\n      const args = expression.get('arguments');\n      if (!callee.isFunctionExpression() || args.length !== 1) return;\n      const [arg] = args;\n      if (arg.isLogicalExpression({ operator: '||' })) {\n        referenceAll(arg);\n      }\n    },\n  });\n}\n\nconst fixed = new WeakSet<NodePath<Program>>();\n\nfunction removeUnreferenced(items: NodePath<Identifier | JSXIdentifier>[]) {\n  const referenced = new Set<NodePath<Identifier | JSXIdentifier>>();\n  items.forEach((item) => {\n    if (!item.node || isRemoved(item)) return;\n    const binding = getScope(item).getBinding(item.node.name);\n    if (!binding) return;\n    const hasReferences =\n      binding.referencePaths.filter((i) => !isRemoved(i)).length > 0;\n    if (hasReferences) {\n      referenced.add(item);\n      return;\n    }\n\n    const forDeleting = [binding.path, ...binding.constantViolations]\n      .map((i) => findParentForDelete(i))\n      .filter(isNotNull);\n\n    if (forDeleting.length === 0) return;\n\n    findIdentifiers(forDeleting).forEach((identifier) => {\n      referenced.add(identifier);\n    });\n\n    removeWithRelated(forDeleting);\n  });\n\n  const result = [...referenced];\n  result.sort((a, b) => a.node?.name.localeCompare(b.node?.name));\n\n  return result;\n}\n\nfunction removeWithRelated(paths: NodePath[]) {\n  if (paths.length === 0) return;\n\n  const rootPath = getScope(paths[0]).getProgramParent()\n    .path as NodePath<Program>;\n\n  if (!fixed.has(rootPath)) {\n    // Some libraries don't care about bindings, references, and other staff\n    // So we have to fix the scope before we can detect unused code\n    referenceEnums(rootPath);\n    fixed.add(rootPath);\n  }\n\n  let clean = false;\n  let referencedIdentifiers: NodePath<Identifier | JSXIdentifier>[] = [];\n  const declared: Binding[] = [];\n\n  paths.forEach((path) => {\n    const deletingPath = findParentForDelete(path);\n    if (!deletingPath) return;\n\n    referencedIdentifiers.push(\n      ...findIdentifiers([deletingPath], 'referenced')\n    );\n    declared.push(\n      ...findIdentifiers([deletingPath], 'binding').map(\n        (i) => getScope(i).getBinding(i.node.name)!\n      )\n    );\n\n    mutate(deletingPath, (p) => {\n      if (!isRemoved(p)) p.remove();\n    });\n  });\n\n  if (declared.length > 0) {\n    removeWithRelated(\n      declared.reduce(\n        (acc, i) => [...acc, ...i.referencePaths.filter(nonType)],\n        [] as NodePath[]\n      )\n    );\n  }\n\n  referencedIdentifiers.sort((a, b) =>\n    a.node?.name.localeCompare(b.node?.name)\n  );\n\n  while (!clean && referencedIdentifiers.length > 0) {\n    const referenced = removeUnreferenced(referencedIdentifiers);\n    clean =\n      referenced.map((i) => i.node?.name).join('|') ===\n      referencedIdentifiers.map((i) => i.node?.name).join('|');\n    referencedIdentifiers = referenced;\n  }\n}\n\nfunction mutate<T extends NodePath>(path: T, fn: (p: T) => NodePath[] | void) {\n  const dereferenced = dereferenceAll(path);\n\n  const mutated = fn(path);\n\n  referenceAll(path);\n  mutated?.forEach((p) => referenceAll(p));\n\n  const dead = dereferenced.filter((p) => !isReferenced(p));\n\n  const forDeleting: NodePath[] = [];\n  dead.forEach((binding) => {\n    const assignments = [binding.path, ...binding.constantViolations];\n    assignments.forEach((assignment) => {\n      const { scope } = assignment;\n      const declared = Object.values(\n        assignment.getOuterBindingIdentifiers(false)\n      );\n      if (\n        declared.length === 1 &&\n        'name' in declared[0] &&\n        declared[0].name === binding.identifier.name\n      ) {\n        // Only one identifier is declared, so we can remove the whole declaration\n        forDeleting.push(assignment);\n        return;\n      }\n\n      if (\n        declared.every(\n          (identifier) =>\n            identifier.type === 'Identifier' &&\n            !scope.getBinding(identifier.name)?.referenced\n        )\n      ) {\n        // No other identifier is referenced, so we can remove the whole declaration\n        forDeleting.push(assignment);\n        return;\n      }\n\n      // We can't remove the binding, but we can remove the part of it\n      assignment.traverse({\n        Identifier(identifier) {\n          if (identifier.node.name === binding.identifier.name) {\n            const parent = identifier.parentPath;\n            if (\n              parent.isArrayPattern() &&\n              identifier.listKey === 'elements' &&\n              typeof identifier.key === 'number'\n            ) {\n              parent.node.elements[identifier.key] = null;\n            } else if (parent.isObjectProperty()) {\n              forDeleting.push(parent);\n            }\n          }\n        },\n      });\n    });\n  });\n\n  removeWithRelated(forDeleting);\n}\n\nexport { mutate, removeWithRelated 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Keep it alive for now.\n  if ((binding.kind as string) === 'param') {\n    return true;\n  }\n\n  // If all remaining references are in TS/Flow types, binding is unreferenced\n  return binding.referencePaths.some(\n    (i) => !i.find((ancestor) => ancestor.isTSType() || ancestor.isFlowType())\n  );\n}\n\nexport function dereference(\n  path: NodePath<Identifier | JSXIdentifier>\n): Binding | null {\n  const binding = getBinding(path);\n  if (!binding) return null;\n\n  if (!binding.referencePaths.includes(path)) {\n    return null;\n  }\n\n  binding.references -= 1;\n  binding.referencePaths = binding.referencePaths.filter((i) => i !== path);\n  binding.referenced = binding.referencePaths.length > 0;\n\n  return binding;\n}\n\nfunction dereferenceAll(path: NodePath): Binding[] {\n  return findIdentifiers([path])\n    .map((identifierPath) => dereference(identifierPath))\n    .filter(isNotNull);\n}\n\nexport function referenceAll(path: NodePath): void {\n  findIdentifiers([path]).forEach((identifierPath) =>\n    reference(identifierPath)\n  );\n}\n\nconst deletingNodes = new WeakSet<NodePath>();\n\nconst isEmptyList = (list: NodePath[]) =>\n  list.length === 0 || list.every((i) => deletingNodes.has(i));\n\ntype ReplaceAction = [action: 'replace', what: NodePath, by: Node];\ntype RemoveAction = [action: 'remove', what: NodePath];\n\nconst getPathFromAction = (action: RemoveAction | ReplaceAction) => {\n  if (!Array.isArray(action)) {\n    return action;\n  }\n\n  if (action[0] === 'replace' || action[0] === 'remove') {\n    return action[1];\n  }\n\n  throw new Error(`Unknown action type: ${action[0]}`);\n};\n\nexport function findActionForNode(\n  path: NodePath\n): RemoveAction | ReplaceAction | null {\n  if (isRemoved(path)) return null;\n\n  deletingNodes.add(path);\n\n  const parent = path.parentPath;\n\n  if (!parent) return ['remove', path];\n\n  if (parent.isProgram()) {\n    // Do not delete Program node\n    return ['remove', path];\n  }\n\n  if (parent.isFunction() && path.listKey === 'params') {\n    // Do not remove params of functions\n    return null;\n  }\n\n  if (parent.isLogicalExpression({ operator: '&&' })) {\n    return [\n      'replace',\n      parent,\n      {\n        type: 'BooleanLiteral',\n        value: false,\n      },\n    ];\n  }\n\n  if (parent.isObjectProperty()) {\n    // let's check if it is a special case with Object.defineProperty\n    const key = parent.get('key');\n    if (key.isIdentifier({ name: 'get' })) {\n      const maybeDefineProperty = parent.parentPath.parentPath;\n      if (\n        maybeDefineProperty?.isCallExpression() &&\n        maybeDefineProperty\n          .get('callee')\n          .matchesPattern('Object.defineProperty')\n      ) {\n        return findActionForNode(maybeDefineProperty);\n      }\n    }\n\n    return findActionForNode(parent);\n  }\n\n  if (parent.isTemplateLiteral()) {\n    return [\n      'replace',\n      path,\n      {\n        type: 'StringLiteral',\n        value: '',\n      },\n    ];\n  }\n\n  if (parent.isAssignmentExpression()) {\n    return findActionForNode(parent);\n  }\n\n  if (parent.isCallExpression()) {\n    return findActionForNode(parent);\n  }\n\n  if (parent.isForInStatement({ left: path.node })) {\n    return findActionForNode(parent);\n  }\n\n  if (\n    parent.isFunctionExpression({ body: path.node }) ||\n    parent.isFunctionDeclaration() ||\n    parent.isObjectMethod() ||\n    parent.isClassMethod()\n  ) {\n    return findActionForNode(parent);\n  }\n\n  if (parent.isBlockStatement()) {\n    const body = parent.get('body');\n    if (isEmptyList(body)) {\n      return findActionForNode(parent);\n    }\n\n    if (path.listKey === 'body' && typeof path.key === 'number') {\n      if (path.key > 0) {\n        // We can check whether the previous one can be removed\n        const prevStatement = body[path.key - 1];\n        if (\n          prevStatement.isIfStatement() &&\n          prevStatement.get('consequent').isReturnStatement()\n        ) {\n          // It's `if (…) return …`, we can remove it.\n          return findActionForNode(prevStatement);\n        }\n      } else if (\n        body.slice(1).every((statement) => deletingNodes.has(statement))\n      ) {\n        // If it is the first statement and all other statements\n        // are marked for deletion, we can remove the whole block.\n        return findActionForNode(parent);\n      }\n    }\n  }\n\n  if (parent.isVariableDeclarator()) {\n    return findActionForNode(parent);\n  }\n\n  if (\n    parent.isExportNamedDeclaration() &&\n    ((path.key === 'specifiers' && isEmptyList(parent.get('specifiers'))) ||\n      (path.key === 'declaration' && parent.node.declaration === path.node))\n  ) {\n    return findActionForNode(parent);\n  }\n\n  for (const key of ['body', 'declarations', 'specifiers']) {\n    if (path.listKey === key && typeof path.key === 'number') {\n      const list = parent.get(key) as NodePath[];\n      if (isEmptyList(list)) {\n        return findActionForNode(parent);\n      }\n    }\n  }\n\n  if (parent.isTryStatement()) {\n    return findActionForNode(parent);\n  }\n\n  if (!path.listKey) {\n    const field = NODE_FIELDS[parent.type][path.key];\n    if (!validateField(parent.node, path.key as string, null, field)) {\n      // The parent node isn't valid without this field, so we should remove it also.\n      return findActionForNode(parent);\n    }\n  }\n\n  for (const key of [\n    'argument',\n    'block',\n    'body',\n    'callee',\n    'discriminant',\n    'expression',\n    'id',\n    'left',\n    'object',\n    'property',\n    'right',\n    'test',\n  ]) {\n    if (path.key === key && parent.get(key) === path) {\n      return findActionForNode(parent);\n    }\n  }\n\n  return ['remove', path];\n}\n\n// @babel/preset-typescript transpiles enums, but doesn't reference used identifiers.\nfunction referenceEnums(program: NodePath<Program>) {\n  /*\n   * We 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(!binding) return;\n    const hasReferences =\n      binding.referencePaths.filter((i) => !isRemoved(i)).length > 0;\n    if (hasReferences) {\n      referenced.add(item);\n      return;\n    }\n\n    const forDeleting = [binding.path, ...binding.constantViolations]\n      .map(findActionForNode)\n      .filter(isNotNull)\n      .map(getPathFromAction);\n\n    if (forDeleting.length === 0) return;\n\n    findIdentifiers(forDeleting).forEach((identifier) => {\n      referenced.add(identifier);\n    });\n\n    removeWithRelated(forDeleting);\n  });\n\n  const result = [...referenced];\n  result.sort((a, b) => a.node?.name.localeCompare(b.node?.name));\n\n  return result;\n}\n\nfunction removeWithRelated(paths: NodePath[]) {\n  if (paths.length === 0) return;\n\n  const rootPath = getScope(paths[0]).getProgramParent()\n    .path as NodePath<Program>;\n\n  if (!fixed.has(rootPath)) {\n    // Some libraries don't care about bindings, references, and other staff\n    // So we have to fix the scope before we can detect unused code\n    referenceEnums(rootPath);\n    fixed.add(rootPath);\n  }\n\n  const actions: (ReplaceAction | RemoveAction)[] = paths\n    .map(findActionForNode)\n    .filter(isNotNull);\n\n  const affectedPaths = actions.map(getPathFromAction);\n\n  let referencedIdentifiers = findIdentifiers(affectedPaths, 'referenced');\n  const referencesOfBinding = findIdentifiers(affectedPaths, 'binding')\n    .map((i) => (i.node && getScope(i).getBinding(i.node.name)) ?? null)\n    .filter(isNotNull)\n    .reduce(\n      (acc, i) => [...acc, ...i.referencePaths.filter(nonType)],\n      [] as NodePath[]\n    );\n\n  actions.forEach((action) => {\n    mutate(action[1], (p) => {\n      if (isRemoved(p)) return;\n\n      if (action[0] === 'remove') {\n        p.remove();\n      } else if (action[0] === 'replace') {\n        p.replaceWith(action[2]);\n      }\n    });\n  });\n\n  removeWithRelated(referencesOfBinding);\n\n  referencedIdentifiers.sort((a, b) =>\n    a.node?.name.localeCompare(b.node?.name)\n  );\n\n  let clean = false;\n  while (!clean && referencedIdentifiers.length > 0) {\n    const referenced = removeUnreferenced(referencedIdentifiers);\n    clean =\n      referenced.map((i) => i.node?.name).join('|') ===\n      referencedIdentifiers.map((i) => i.node?.name).join('|');\n    referencedIdentifiers = referenced;\n  }\n}\n\nfunction mutate<T extends NodePath>(path: T, fn: (p: T) => NodePath[] | void) {\n  const dereferenced = dereferenceAll(path);\n\n  const mutated = fn(path);\n\n  referenceAll(path);\n  mutated?.forEach((p) => referenceAll(p));\n\n  const dead = dereferenced.filter((p) => !isReferenced(p));\n\n  const forDeleting: NodePath[] = [];\n  dead.forEach((binding) => {\n    const assignments = [binding.path, ...binding.constantViolations];\n    assignments.forEach((assignment) => {\n      const { scope } = assignment;\n      const declared = Object.values(\n        assignment.getOuterBindingIdentifiers(false)\n      );\n      if (\n        declared.length === 1 &&\n        'name' in declared[0] &&\n        declared[0].name === binding.identifier.name\n      ) {\n        // Only one identifier is declared, so we can remove the whole declaration\n        forDeleting.push(assignment);\n        return;\n      }\n\n      if (\n        declared.every(\n          (identifier) =>\n            identifier.type === 'Identifier' &&\n            !scope.getBinding(identifier.name)?.referenced\n        )\n      ) {\n        // No other identifier is referenced, so we can remove the whole declaration\n        forDeleting.push(assignment);\n        return;\n      }\n\n      // We can't remove the binding, but we can remove the part of it\n      assignment.traverse({\n        Identifier(identifier) {\n          if (identifier.node.name === binding.identifier.name) {\n            const parent = identifier.parentPath;\n            if (\n              parent.isArrayPattern() &&\n              identifier.listKey === 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lib/scopeHelpers.js

@@ -7,3 +7,3 @@ "use strict";
 exports.dereference = dereference;
-exports.findParentForDelete = findParentForDelete;
+exports.findActionForNode = findActionForNode;
 exports.mutate = mutate;
@@ -108,23 +108,39 @@ exports.reference = reference;
 
-function findParentForDelete(path) {
+const isEmptyList = list => list.length === 0 || list.every(i => deletingNodes.has(i));
+
+const getPathFromAction = action => {
+  if (!Array.isArray(action)) {
+    return action;
+  }
+
+  if (action[0] === 'replace' || action[0] === 'remove') {
+    return action[1];
+  }
+
+  throw new Error(`Unknown action type: ${action[0]}`);
+};
+
+function findActionForNode(path) {
   if ((0, _isRemoved.default)(path)) return null;
   deletingNodes.add(path);
   const parent = path.parentPath;
-  if (!parent) return path;
+  if (!parent) return ['remove', path];
 
   if (parent.isProgram()) {
     // Do not delete Program node
-    return path;
+    return ['remove', path];
   }
 
+  if (parent.isFunction() && path.listKey === 'params') {
+    // Do not remove params of functions
+    return null;
+  }
+
   if (parent.isLogicalExpression({
     operator: '&&'
   })) {
-    mutate(parent, p => {
-      p.replaceWith({
-        type: 'BooleanLiteral',
-        value: false
-      });
-    });
-    return null;
+    return ['replace', parent, {
+      type: 'BooleanLiteral',
+      value: false
+    }];
   }
@@ -142,25 +158,22 @@
       if (maybeDefineProperty !== null && maybeDefineProperty !== void 0 && maybeDefineProperty.isCallExpression() && maybeDefineProperty.get('callee').matchesPattern('Object.defineProperty')) {
-        return findParentForDelete(maybeDefineProperty);
+        return findActionForNode(maybeDefineProperty);
       }
     }
 
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
 
   if (parent.isTemplateLiteral()) {
-    mutate(path, p => {
-      p.replaceWith({
-        type: 'StringLiteral',
-        value: ''
-      });
-    });
-    return null;
+    return ['replace', path, {
+      type: 'StringLiteral',
+      value: ''
+    }];
   }
 
   if (parent.isAssignmentExpression()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
 
   if (parent.isCallExpression()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
@@ -171,3 +184,3 @@
   })) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
@@ -178,3 +191,3 @@
   }) || parent.isFunctionDeclaration() || parent.isObjectMethod() || parent.isClassMethod()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
@@ -185,4 +198,4 @@
 
-    if (body.length === 1) {
-      return findParentForDelete(parent);
+    if (isEmptyList(body)) {
+      return findActionForNode(parent);
     }
@@ -197,3 +210,3 @@
           // It's `if (…) return …`, we can remove it.
-          return findParentForDelete(prevStatement);
+          return findActionForNode(prevStatement);
         }
@@ -203,3 +216,3 @@ } else if (body.slice(1).every(statement => deletingNodes.has(statement))) {
         // are marked for deletion, we can remove the whole block.
-        return findParentForDelete(parent);
+        return findActionForNode(parent);
       }
@@ -210,7 +223,7 @@ }
   if (parent.isVariableDeclarator()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
 
-  if (parent.isExportNamedDeclaration() && (parent.node.specifiers.length === 1 && parent.node.specifiers[0] === path.node || parent.node.declaration === path.node)) {
-    return findParentForDelete(parent);
+  if (parent.isExportNamedDeclaration() && (path.key === 'specifiers' && isEmptyList(parent.get('specifiers')) || path.key === 'declaration' && parent.node.declaration === path.node)) {
+    return findActionForNode(parent);
   }
@@ -222,4 +235,4 @@
 
-      if (list.length === 1) {
-        return findParentForDelete(parent);
+      if (isEmptyList(list)) {
+        return findActionForNode(parent);
       }
@@ -230,3 +243,3 @@ }
   if (parent.isTryStatement()) {
-    return findParentForDelete(parent);
+    return findActionForNode(parent);
   }
@@ -239,3 +252,3 @@
       // The parent node isn't valid without this field, so we should remove it also.
-      return findParentForDelete(parent);
+      return findActionForNode(parent);
     }
@@ -246,7 +259,7 @@ }
     if (path.key === key && parent.get(key) === path) {
-      return findParentForDelete(parent);
+      return findActionForNode(parent);
     }
   }
 
-  return path;
+  return ['remove', path];
 } // @babel/preset-typescript transpiles enums, but doesn't reference used identifiers.
@@ -296,3 +309,3 @@
 
-    const forDeleting = [binding.path, ...binding.constantViolations].map(i => findParentForDelete(i)).filter(_isNotNull.default);
+    const forDeleting = [binding.path, ...binding.constantViolations].map(findActionForNode).filter(_isNotNull.default).map(getPathFromAction);
     if (forDeleting.length === 0) return;
@@ -324,19 +337,22 @@ (0, _findIdentifiers.default)(forDeleting).forEach(identifier => {
 
-  let clean = false;
-  let referencedIdentifiers = [];
-  const declared = [];
-  paths.forEach(path => {
-    const deletingPath = findParentForDelete(path);
-    if (!deletingPath) return;
-    referencedIdentifiers.push(...(0, _findIdentifiers.default)([deletingPath], 'referenced'));
-    declared.push(...(0, _findIdentifiers.default)([deletingPath], 'binding').map(i => (0, _getScope.getScope)(i).getBinding(i.node.name)));
-    mutate(deletingPath, p => {
-      if (!(0, _isRemoved.default)(p)) p.remove();
+  const actions = paths.map(findActionForNode).filter(_isNotNull.default);
+  const affectedPaths = actions.map(getPathFromAction);
+  let referencedIdentifiers = (0, _findIdentifiers.default)(affectedPaths, 'referenced');
+  const referencesOfBinding = (0, _findIdentifiers.default)(affectedPaths, 'binding').map(i => {
+    var _ref;
+
+    return (_ref = i.node && (0, _getScope.getScope)(i).getBinding(i.node.name)) !== null && _ref !== void 0 ? _ref : null;
+  }).filter(_isNotNull.default).reduce((acc, i) => [...acc, ...i.referencePaths.filter(_findIdentifiers.nonType)], []);
+  actions.forEach(action => {
+    mutate(action[1], p => {
+      if ((0, _isRemoved.default)(p)) return;
+
+      if (action[0] === 'remove') {
+        p.remove();
+      } else if (action[0] === 'replace') {
+        p.replaceWith(action[2]);
+      }
     });
   });
-
-  if (declared.length > 0) {
-    removeWithRelated(declared.reduce((acc, i) => [...acc, ...i.referencePaths.filter(_findIdentifiers.nonType)], []));
-  }
-
+  removeWithRelated(referencesOfBinding);
   referencedIdentifiers.sort((a, b) => {
@@ -347,2 +363,3 @@ var _a$node2, _b$node2;
   });
+  let clean = false;
 
@@ -349,0 +366,0 @@ while (!clean && referencedIdentifiers.length > 0) {

lib/scopeHelpers.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"scopeHelpers.js","names":["validateField","node","key","val","field","validate","optional","getBinding","path","binding","getScope","name","undefined","reference","referencePath","force","isReferencedIdentifier","referencePaths","includes","referenced","references","push","isReferenced","kind","some","i","find","ancestor","isTSType","isFlowType","dereference","filter","length","dereferenceAll","findIdentifiers","map","identifierPath","isNotNull","referenceAll","forEach","deletingNodes","WeakSet","findParentForDelete","isRemoved","add","parent","parentPath","isProgram","isLogicalExpression","operator","mutate","p","replaceWith","type","value","isObjectProperty","get","isIdentifier","maybeDefineProperty","isCallExpression","matchesPattern","isTemplateLiteral","isAssignmentExpression","isForInStatement","left","isFunctionExpression","body","isFunctionDeclaration","isObjectMethod","isClassMethod","isBlockStatement","listKey","prevStatement","isIfStatement","isReturnStatement","slice","every","statement","has","isVariableDeclarator","isExportNamedDeclaration","specifiers","declaration","list","isTryStatement","NODE_FIELDS","referenceEnums","program","traverse","ExpressionStatement","expressionStatement","expression","callee","args","arg","fixed","removeUnreferenced","items","Set","item","hasReferences","forDeleting","constantViolations","identifier","removeWithRelated","result","sort","a","b","localeCompare","paths","rootPath","getProgramParent","clean","referencedIdentifiers","declared","deletingPath","remove","reduce","acc","nonType","join","fn","dereferenced","mutated","dead","assignments","assignment","scope","Object","values","getOuterBindingIdentifiers","Identifier","isArrayPattern","elements"],"sources":["../src/scopeHelpers.ts"],"sourcesContent":["/* eslint-disable no-restricted-syntax */\n/* eslint @typescript-eslint/no-use-before-define: [\"error\", { \"functions\": false }] */\n\nimport type { Binding, NodePath } from '@babel/traverse';\nimport type {\n  Node,\n  Identifier,\n  JSXIdentifier,\n  Program,\n  FieldOptions,\n} from '@babel/types';\nimport { NODE_FIELDS } from '@babel/types';\n\nimport findIdentifiers, { nonType } from './findIdentifiers';\nimport { getScope } from './getScope';\nimport isNotNull from './isNotNull';\nimport isRemoved from './isRemoved';\n\nfunction validateField(\n  node: Node,\n  key: string,\n  val: unknown,\n  field: FieldOptions\n) {\n  if (!(field != null && field.validate)) return true;\n  if (field.optional && val == null) return true;\n  try {\n    field.validate(node, key, val);\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction getBinding(path: NodePath<Identifier | JSXIdentifier>) {\n  const binding = getScope(path).getBinding(path.node.name);\n  if (!binding) {\n    return undefined;\n  }\n\n  return binding;\n}\n\nexport function reference(\n  path: NodePath<Identifier | JSXIdentifier>,\n  referencePath: NodePath = path,\n  force = false\n): void {\n  if (!force && !path.isReferencedIdentifier()) return;\n\n  const binding = getBinding(path);\n  if (!binding) return;\n\n  if (binding.referencePaths.includes(referencePath)) {\n    return;\n  }\n\n  binding.referenced = true;\n  binding.references += 1;\n  binding.referencePaths.push(referencePath ?? path);\n}\n\nfunction isReferenced(binding: Binding) {\n  if (!binding.referenced) {\n    return false;\n  }\n\n  // If it's a param binding, we can't just remove it\n  // because it brakes the function signature. Keep it alive for now.\n  if ((binding.kind as string) === 'param') {\n    return true;\n  }\n\n  // If all remaining references are in TS/Flow types, binding is unreferenced\n  return binding.referencePaths.some(\n    (i) => !i.find((ancestor) => ancestor.isTSType() || ancestor.isFlowType())\n  );\n}\n\nexport function dereference(\n  path: NodePath<Identifier | JSXIdentifier>\n): Binding | null {\n  const binding = getBinding(path);\n  if (!binding) return null;\n\n  if (!binding.referencePaths.includes(path)) {\n    return null;\n  }\n\n  binding.references -= 1;\n  binding.referencePaths = binding.referencePaths.filter((i) => i !== path);\n  binding.referenced = binding.referencePaths.length > 0;\n\n  return binding;\n}\n\nfunction dereferenceAll(path: NodePath): Binding[] {\n  return findIdentifiers([path])\n    .map((identifierPath) => dereference(identifierPath))\n    .filter(isNotNull);\n}\n\nexport function referenceAll(path: NodePath): void {\n  findIdentifiers([path]).forEach((identifierPath) =>\n    reference(identifierPath)\n  );\n}\n\nconst deletingNodes = new WeakSet<NodePath>();\n\nexport function findParentForDelete(path: NodePath): NodePath | null {\n  if (isRemoved(path)) return null;\n\n  deletingNodes.add(path);\n\n  const parent = path.parentPath;\n\n  if (!parent) return path;\n\n  if (parent.isProgram()) {\n    // Do not delete Program node\n    return path;\n  }\n\n  if (parent.isLogicalExpression({ operator: '&&' })) {\n    mutate(parent, (p) => {\n      p.replaceWith({\n        type: 'BooleanLiteral',\n        value: false,\n      });\n    });\n\n    return null;\n  }\n\n  if (parent.isObjectProperty()) {\n    // let's check if it is a special case with Object.defineProperty\n    const key = parent.get('key');\n    if (key.isIdentifier({ name: 'get' })) {\n      const maybeDefineProperty = parent.parentPath.parentPath;\n      if (\n        maybeDefineProperty?.isCallExpression() &&\n        maybeDefineProperty\n          .get('callee')\n          .matchesPattern('Object.defineProperty')\n      ) {\n        return findParentForDelete(maybeDefineProperty);\n      }\n    }\n\n    return findParentForDelete(parent);\n  }\n\n  if (parent.isTemplateLiteral()) {\n    mutate(path, (p) => {\n      p.replaceWith({\n        type: 'StringLiteral',\n        value: '',\n      });\n    });\n    return null;\n  }\n\n  if (parent.isAssignmentExpression()) {\n    return findParentForDelete(parent);\n  }\n\n  if (parent.isCallExpression()) {\n    return findParentForDelete(parent);\n  }\n\n  if (parent.isForInStatement({ left: path.node })) {\n    return findParentForDelete(parent);\n  }\n\n  if (\n    parent.isFunctionExpression({ body: path.node }) ||\n    parent.isFunctionDeclaration() ||\n    parent.isObjectMethod() ||\n    parent.isClassMethod()\n  ) {\n    return findParentForDelete(parent);\n  }\n\n  if (parent.isBlockStatement()) {\n    const body = parent.get('body');\n    if (body.length === 1) {\n      return findParentForDelete(parent);\n    }\n\n    if (path.listKey === 'body' && typeof path.key === 'number') {\n      if (path.key > 0) {\n        // We can check whether the previous one can be removed\n        const prevStatement = body[path.key - 1];\n        if (\n          prevStatement.isIfStatement() &&\n          prevStatement.get('consequent').isReturnStatement()\n        ) {\n          // It's `if (…) return …`, we can remove it.\n          return findParentForDelete(prevStatement);\n        }\n      } else if (\n        body.slice(1).every((statement) => deletingNodes.has(statement))\n      ) {\n        // If it is the first statement and all other statements\n        // are marked for deletion, we can remove the whole block.\n        return findParentForDelete(parent);\n      }\n    }\n  }\n\n  if (parent.isVariableDeclarator()) {\n    return findParentForDelete(parent);\n  }\n\n  if (\n    parent.isExportNamedDeclaration() &&\n    ((parent.node.specifiers.length === 1 &&\n      parent.node.specifiers[0] === path.node) ||\n      parent.node.declaration === path.node)\n  ) {\n    return findParentForDelete(parent);\n  }\n\n  for (const key of ['body', 'declarations', 'specifiers']) {\n    if (path.listKey === key && typeof path.key === 'number') {\n      const list = parent.get(key) as NodePath[];\n      if (list.length === 1) {\n        return findParentForDelete(parent);\n      }\n    }\n  }\n\n  if (parent.isTryStatement()) {\n    return findParentForDelete(parent);\n  }\n\n  if (!path.listKey) {\n    const field = NODE_FIELDS[parent.type][path.key];\n    if (!validateField(parent.node, path.key as string, null, field)) {\n      // The parent node isn't valid without this field, so we should remove it also.\n      return findParentForDelete(parent);\n    }\n  }\n\n  for (const key of [\n    'argument',\n    'block',\n    'body',\n    'callee',\n    'discriminant',\n    'expression',\n    'id',\n    'left',\n    'object',\n    'property',\n    'right',\n    'test',\n  ]) {\n    if (path.key === key && parent.get(key) === path) {\n      return findParentForDelete(parent);\n    }\n  }\n\n  return path;\n}\n\n// @babel/preset-typescript transpiles enums, but doesn't reference used identifiers.\nfunction referenceEnums(program: NodePath<Program>) {\n  /*\n   * We are looking for transpiled enums.\n   *   (function (Colors) {\n   *     Colors[\"BLUE\"] = \"#27509A\";\n   *   })(Colors || (Colors = {}));\n   */\n  program.traverse({\n    ExpressionStatement(expressionStatement) {\n      const expression = expressionStatement.get('expression');\n      if (!expression.isCallExpression()) return;\n\n      const callee = expression.get('callee');\n      const args = expression.get('arguments');\n      if (!callee.isFunctionExpression() || args.length !== 1) return;\n      const [arg] = args;\n      if (arg.isLogicalExpression({ operator: '||' })) {\n        referenceAll(arg);\n      }\n    },\n  });\n}\n\nconst fixed = new WeakSet<NodePath<Program>>();\n\nfunction removeUnreferenced(items: NodePath<Identifier | JSXIdentifier>[]) {\n  const referenced = new Set<NodePath<Identifier | JSXIdentifier>>();\n  items.forEach((item) => {\n    if (!item.node || isRemoved(item)) return;\n    const binding = getScope(item).getBinding(item.node.name);\n    if (!binding) return;\n    const hasReferences =\n      binding.referencePaths.filter((i) => !isRemoved(i)).length > 0;\n    if (hasReferences) {\n      referenced.add(item);\n      return;\n    }\n\n    const forDeleting = [binding.path, ...binding.constantViolations]\n      .map((i) => findParentForDelete(i))\n      .filter(isNotNull);\n\n    if (forDeleting.length === 0) return;\n\n    findIdentifiers(forDeleting).forEach((identifier) => {\n      referenced.add(identifier);\n    });\n\n    removeWithRelated(forDeleting);\n  });\n\n  const result = [...referenced];\n  result.sort((a, b) => a.node?.name.localeCompare(b.node?.name));\n\n  return result;\n}\n\nfunction removeWithRelated(paths: NodePath[]) {\n  if (paths.length === 0) return;\n\n  const rootPath = getScope(paths[0]).getProgramParent()\n    .path as NodePath<Program>;\n\n  if (!fixed.has(rootPath)) {\n    // Some libraries don't care about bindings, references, and other staff\n    // So we have to fix the scope before we can detect unused code\n    referenceEnums(rootPath);\n    fixed.add(rootPath);\n  }\n\n  let clean = false;\n  let referencedIdentifiers: NodePath<Identifier | JSXIdentifier>[] = [];\n  const declared: Binding[] = [];\n\n  paths.forEach((path) => {\n    const deletingPath = findParentForDelete(path);\n    if (!deletingPath) return;\n\n    referencedIdentifiers.push(\n      ...findIdentifiers([deletingPath], 'referenced')\n    );\n    declared.push(\n      ...findIdentifiers([deletingPath], 'binding').map(\n        (i) => getScope(i).getBinding(i.node.name)!\n      )\n    );\n\n    mutate(deletingPath, (p) => {\n      if (!isRemoved(p)) p.remove();\n    });\n  });\n\n  if (declared.length > 0) {\n    removeWithRelated(\n      declared.reduce(\n        (acc, i) => [...acc, ...i.referencePaths.filter(nonType)],\n        [] as NodePath[]\n      )\n    );\n  }\n\n  referencedIdentifiers.sort((a, b) =>\n    a.node?.name.localeCompare(b.node?.name)\n  );\n\n  while (!clean && referencedIdentifiers.length > 0) {\n    const referenced = removeUnreferenced(referencedIdentifiers);\n    clean =\n      referenced.map((i) => i.node?.name).join('|') ===\n      referencedIdentifiers.map((i) => i.node?.name).join('|');\n    referencedIdentifiers = referenced;\n  }\n}\n\nfunction mutate<T extends NodePath>(path: T, fn: (p: T) => NodePath[] | void) {\n  const dereferenced = dereferenceAll(path);\n\n  const mutated = fn(path);\n\n  referenceAll(path);\n  mutated?.forEach((p) => referenceAll(p));\n\n  const dead = dereferenced.filter((p) => !isReferenced(p));\n\n  const forDeleting: NodePath[] = [];\n  dead.forEach((binding) => {\n    const assignments = [binding.path, ...binding.constantViolations];\n    assignments.forEach((assignment) => {\n      const { scope } = assignment;\n      const declared = Object.values(\n        assignment.getOuterBindingIdentifiers(false)\n      );\n      if (\n        declared.length === 1 &&\n        'name' in declared[0] &&\n        declared[0].name === binding.identifier.name\n      ) {\n        // Only one identifier is declared, so we can remove the whole declaration\n        forDeleting.push(assignment);\n        return;\n      }\n\n      if (\n        declared.every(\n          (identifier) =>\n            identifier.type === 'Identifier' &&\n            !scope.getBinding(identifier.name)?.referenced\n        )\n      ) {\n        // No other identifier is referenced, so we can remove the whole declaration\n        forDeleting.push(assignment);\n        return;\n      }\n\n      // We can't remove the binding, but we can remove the part of it\n      assignment.traverse({\n     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Keep it alive for now.\n  if ((binding.kind as string) === 'param') {\n    return true;\n  }\n\n  // If all remaining references are in TS/Flow types, binding is unreferenced\n  return binding.referencePaths.some(\n    (i) => !i.find((ancestor) => ancestor.isTSType() || ancestor.isFlowType())\n  );\n}\n\nexport function dereference(\n  path: NodePath<Identifier | JSXIdentifier>\n): Binding | null {\n  const binding = getBinding(path);\n  if (!binding) return null;\n\n  if (!binding.referencePaths.includes(path)) {\n    return null;\n  }\n\n  binding.references -= 1;\n  binding.referencePaths = binding.referencePaths.filter((i) => i !== path);\n  binding.referenced = binding.referencePaths.length > 0;\n\n  return binding;\n}\n\nfunction dereferenceAll(path: NodePath): Binding[] {\n  return findIdentifiers([path])\n    .map((identifierPath) => dereference(identifierPath))\n    .filter(isNotNull);\n}\n\nexport function referenceAll(path: NodePath): void {\n  findIdentifiers([path]).forEach((identifierPath) =>\n    reference(identifierPath)\n  );\n}\n\nconst deletingNodes = new WeakSet<NodePath>();\n\nconst isEmptyList = (list: NodePath[]) =>\n  list.length === 0 || list.every((i) => deletingNodes.has(i));\n\ntype ReplaceAction = [action: 'replace', what: NodePath, by: Node];\ntype RemoveAction = [action: 'remove', what: NodePath];\n\nconst getPathFromAction = (action: RemoveAction | ReplaceAction) => {\n  if (!Array.isArray(action)) {\n    return action;\n  }\n\n  if (action[0] === 'replace' || action[0] === 'remove') {\n    return action[1];\n  }\n\n  throw new Error(`Unknown action type: ${action[0]}`);\n};\n\nexport function findActionForNode(\n  path: NodePath\n): RemoveAction | ReplaceAction | null {\n  if (isRemoved(path)) return null;\n\n  deletingNodes.add(path);\n\n  const parent = path.parentPath;\n\n  if (!parent) return ['remove', path];\n\n  if (parent.isProgram()) {\n    // Do not delete Program node\n    return ['remove', path];\n  }\n\n  if (parent.isFunction() && path.listKey === 'params') {\n    // Do not remove params of functions\n    return null;\n  }\n\n  if (parent.isLogicalExpression({ operator: '&&' })) {\n    return [\n      'replace',\n      parent,\n      {\n        type: 'BooleanLiteral',\n        value: false,\n      },\n    ];\n  }\n\n  if (parent.isObjectProperty()) {\n    // let's check if it is a special case with Object.defineProperty\n    const key = parent.get('key');\n    if (key.isIdentifier({ name: 'get' })) {\n      const maybeDefineProperty = parent.parentPath.parentPath;\n      if (\n        maybeDefineProperty?.isCallExpression() &&\n        maybeDefineProperty\n          .get('callee')\n          .matchesPattern('Object.defineProperty')\n      ) {\n        return findActionForNode(maybeDefineProperty);\n      }\n    }\n\n    return findActionForNode(parent);\n  }\n\n  if (parent.isTemplateLiteral()) {\n    return [\n      'replace',\n      path,\n      {\n        type: 'StringLiteral',\n        value: '',\n      },\n    ];\n  }\n\n  if (parent.isAssignmentExpression()) {\n    return findActionForNode(parent);\n  }\n\n  if (parent.isCallExpression()) {\n    return findActionForNode(parent);\n  }\n\n  if (parent.isForInStatement({ left: path.node })) {\n    return findActionForNode(parent);\n  }\n\n  if (\n    parent.isFunctionExpression({ body: path.node }) ||\n    parent.isFunctionDeclaration() ||\n    parent.isObjectMethod() ||\n    parent.isClassMethod()\n  ) {\n    return findActionForNode(parent);\n  }\n\n  if (parent.isBlockStatement()) {\n    const body = parent.get('body');\n    if (isEmptyList(body)) {\n      return findActionForNode(parent);\n    }\n\n    if (path.listKey === 'body' && typeof path.key === 'number') {\n      if (path.key > 0) {\n        // We can check whether the previous one can be removed\n        const prevStatement = body[path.key - 1];\n        if (\n          prevStatement.isIfStatement() &&\n          prevStatement.get('consequent').isReturnStatement()\n        ) {\n          // It's `if (…) return …`, we can remove it.\n          return findActionForNode(prevStatement);\n        }\n      } else if (\n        body.slice(1).every((statement) => deletingNodes.has(statement))\n      ) {\n        // If it is the first statement and all other statements\n        // are marked for deletion, we can remove the whole block.\n        return findActionForNode(parent);\n      }\n    }\n  }\n\n  if (parent.isVariableDeclarator()) {\n    return findActionForNode(parent);\n  }\n\n  if (\n    parent.isExportNamedDeclaration() &&\n    ((path.key === 'specifiers' && isEmptyList(parent.get('specifiers'))) ||\n      (path.key === 'declaration' && parent.node.declaration === path.node))\n  ) {\n    return findActionForNode(parent);\n  }\n\n  for (const key of ['body', 'declarations', 'specifiers']) {\n    if (path.listKey === key && typeof path.key === 'number') {\n      const list = parent.get(key) as NodePath[];\n      if (isEmptyList(list)) {\n        return findActionForNode(parent);\n      }\n    }\n  }\n\n  if (parent.isTryStatement()) {\n    return findActionForNode(parent);\n  }\n\n  if (!path.listKey) {\n    const field = NODE_FIELDS[parent.type][path.key];\n    if (!validateField(parent.node, path.key as string, null, field)) {\n      // The parent node isn't valid without this field, so we should remove it also.\n      return findActionForNode(parent);\n    }\n  }\n\n  for (const key of [\n    'argument',\n    'block',\n    'body',\n    'callee',\n    'discriminant',\n    'expression',\n    'id',\n    'left',\n    'object',\n    'property',\n    'right',\n    'test',\n  ]) {\n    if (path.key === key && parent.get(key) === path) {\n      return findActionForNode(parent);\n    }\n  }\n\n  return ['remove', path];\n}\n\n// @babel/preset-typescript transpiles enums, but doesn't reference used identifiers.\nfunction referenceEnums(program: NodePath<Program>) {\n  /*\n   * We are looking for transpiled enums.\n   *   (function (Colors) {\n   *     Colors[\"BLUE\"] = \"#27509A\";\n   *   })(Colors || (Colors = {}));\n   */\n  program.traverse({\n    ExpressionStatement(expressionStatement) {\n      const expression = expressionStatement.get('expression');\n      if (!expression.isCallExpression()) return;\n\n      const callee = expression.get('callee');\n      const args = expression.get('arguments');\n      if (!callee.isFunctionExpression() || args.length !== 1) return;\n      const [arg] = args;\n      if (arg.isLogicalExpression({ operator: '||' })) {\n        referenceAll(arg);\n      }\n    },\n  });\n}\n\nconst fixed = new WeakSet<NodePath<Program>>();\n\nfunction removeUnreferenced(items: NodePath<Identifier | JSXIdentifier>[]) {\n  const referenced = new Set<NodePath<Identifier | JSXIdentifier>>();\n  items.forEach((item) => {\n    if (!item.node || isRemoved(item)) return;\n    const binding = getScope(item).getBinding(item.node.name);\n    if (!binding) return;\n    const hasReferences =\n      binding.referencePaths.filter((i) => !isRemoved(i)).length > 0;\n    if (hasReferences) {\n      referenced.add(item);\n      return;\n    }\n\n    const forDeleting = [binding.path, ...binding.constantViolations]\n      .map(findActionForNode)\n      .filter(isNotNull)\n      .map(getPathFromAction);\n\n    if (forDeleting.length === 0) return;\n\n    findIdentifiers(forDeleting).forEach((identifier) => {\n      referenced.add(identifier);\n    });\n\n    removeWithRelated(forDeleting);\n  });\n\n  const result = [...referenced];\n  result.sort((a, b) => a.node?.name.localeCompare(b.node?.name));\n\n  return result;\n}\n\nfunction removeWithRelated(paths: NodePath[]) {\n  if (paths.length === 0) return;\n\n  const rootPath = getScope(paths[0]).getProgramParent()\n    .path as NodePath<Program>;\n\n  if (!fixed.has(rootPath)) {\n    // Some libraries don't care about bindings, references, and other staff\n    // So we have to fix the scope before we can detect unused code\n    referenceEnums(rootPath);\n    fixed.add(rootPath);\n  }\n\n  const actions: (ReplaceAction | RemoveAction)[] = paths\n    .map(findActionForNode)\n    .filter(isNotNull);\n\n  const affectedPaths = actions.map(getPathFromAction);\n\n  let referencedIdentifiers = findIdentifiers(affectedPaths, 'referenced');\n  const referencesOfBinding = findIdentifiers(affectedPaths, 'binding')\n    .map((i) => (i.node && getScope(i).getBinding(i.node.name)) ?? null)\n    .filter(isNotNull)\n    .reduce(\n      (acc, i) => [...acc, ...i.referencePaths.filter(nonType)],\n      [] as NodePath[]\n    );\n\n  actions.forEach((action) => {\n    mutate(action[1], (p) => {\n      if (isRemoved(p)) return;\n\n      if (action[0] === 'remove') {\n        p.remove();\n      } else if (action[0] === 'replace') {\n        p.replaceWith(action[2]);\n      }\n    });\n  });\n\n  removeWithRelated(referencesOfBinding);\n\n  referencedIdentifiers.sort((a, b) =>\n    a.node?.name.localeCompare(b.node?.name)\n  );\n\n  let clean = false;\n  while (!clean && referencedIdentifiers.length > 0) {\n    const referenced = removeUnreferenced(referencedIdentifiers);\n    clean =\n      referenced.map((i) => i.node?.name).join('|') ===\n      referencedIdentifiers.map((i) => i.node?.name).join('|');\n    referencedIdentifiers = referenced;\n  }\n}\n\nfunction mutate<T extends NodePath>(path: T, fn: (p: T) => NodePath[] | void) {\n  const dereferenced = dereferenceAll(path);\n\n  const mutated = fn(path);\n\n  referenceAll(path);\n  mutated?.forEach((p) => referenceAll(p));\n\n  const dead = dereferenced.filter((p) => !isReferenced(p));\n\n  const forDeleting: NodePath[] = [];\n  dead.forEach((binding) => {\n    const assignments = [binding.path, ...binding.constantViolations];\n    assignments.forEach((assignment) => {\n      const { scope } = assignment;\n      const declared = Object.values(\n        assignment.getOuterBindingIdentifiers(false)\n      );\n      if (\n        declared.length === 1 &&\n        'name' in declared[0] &&\n        declared[0].name === binding.identifier.name\n      ) {\n        // Only one identifier is declared, so we can remove the whole declaration\n        forDeleting.push(assignment);\n        return;\n      }\n\n      if (\n        declared.every(\n          (identifier) =>\n            identifier.type === 'Identifier' &&\n            !scope.getBinding(identifier.name)?.referenced\n        )\n      ) {\n        // No other identifier is referenced, so we can remove the whole declaration\n        forDeleting.push(assignment);\n        return;\n      }\n\n      // We can't remove the binding, but we can remove the part of it\n      assignment.traverse({\n        Identifier(identifier) {\n          if (identifier.node.name === binding.identifier.name) {\n            const parent = identifier.parentPath;\n            if (\n              parent.isArrayPattern() &&\n              identifier.listKey === 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package.json

 {
   "name": "@linaria/utils",
   "description": "Blazing fast zero-runtime CSS in JS library",
-  "version": "4.2.3",
+  "version": "4.2.4",
   "bugs": "https://github.com/callstack/linaria/issues",
@@ -6,0 +6,0 @@ "dependencies": {

types/scopeHelpers.d.ts

 import type { Binding, NodePath } from '@babel/traverse';
-import type { Identifier, JSXIdentifier } from '@babel/types';
+import type { Node, Identifier, JSXIdentifier } from '@babel/types';
 export declare function reference(path: NodePath<Identifier | JSXIdentifier>, referencePath?: NodePath, force?: boolean): void;
 export declare function dereference(path: NodePath<Identifier | JSXIdentifier>): Binding | null;
 export declare function referenceAll(path: NodePath): void;
-export declare function findParentForDelete(path: NodePath): NodePath | null;
+declare type ReplaceAction = [action: 'replace', what: NodePath, by: Node];
+declare type RemoveAction = [action: 'remove', what: NodePath];
+export declare function findActionForNode(path: NodePath): RemoveAction | ReplaceAction | null;
 declare function removeWithRelated(paths: NodePath[]): void;
 declare function mutate<T extends NodePath>(path: T, fn: (p: T) => NodePath[] | void): void;
 export { mutate, removeWithRelated };

No alert changes

Improved metrics

Total package byte prevSize

363452

1.22%

Lines of code

3725

0.62%

No dependency changes