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13 KiB
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{"version":3,"names":["validateUsage","path","state","tdzEnabled","dynamicTDZNames","name","Object","keys","getBindingIdentifiers","binding","scope","getBinding","injectTDZChecks","push","node","kind","disallowConstantViolations","violation","constantViolations","readOnlyError","addHelper","throwNode","t","callExpression","stringLiteral","isAssignmentExpression","operator","left","right","exprs","replaceWith","sequenceExpression","includes","logicalExpression","slice","binaryExpression","isUpdateExpression","unaryExpression","get","isForXStatement","ensureBlock","variableDeclaration","variableDeclarator","generateUidIdentifier","body","unshift","expressionStatement","getTDZStatus","refPath","bindingPath","executionStatus","_guessExecutionStatusRelativeTo","skipTDZChecks","WeakSet","buildTDZAssert","status","clone","cloneNode","add","getTDZReplacement","id","has","isFunctionDeclaration","parent","_tdzThis","allUsages","Set","referencePaths","forEach","dynamicTdz","arg","replacement","insertBefore","nodes","ids","length","parentPath","isFor"],"sources":["../src/validation.ts"],"sourcesContent":["import { types as t, type PluginPass } from \"@babel/core\";\nimport type { Binding, NodePath } from \"@babel/traverse\";\n\nexport function validateUsage(\n path: NodePath<t.VariableDeclaration>,\n state: PluginPass,\n tdzEnabled: boolean,\n) {\n const dynamicTDZNames = [];\n\n for (const name of Object.keys(path.getBindingIdentifiers())) {\n const binding = path.scope.getBinding(name);\n // binding may be null. ref: https://github.com/babel/babel/issues/15300\n if (!binding) continue;\n if (tdzEnabled) {\n if (injectTDZChecks(binding, state)) dynamicTDZNames.push(name);\n }\n if (path.node.kind === \"const\") {\n disallowConstantViolations(name, binding, state);\n }\n }\n\n return dynamicTDZNames;\n}\n\nfunction disallowConstantViolations(\n name: string,\n binding: Binding,\n state: PluginPass,\n) {\n for (const violation of binding.constantViolations) {\n const readOnlyError = state.addHelper(\"readOnlyError\");\n const throwNode = t.callExpression(readOnlyError, [t.stringLiteral(name)]);\n\n if (violation.isAssignmentExpression()) {\n const { operator, left, right } = violation.node;\n if (operator === \"=\") {\n const exprs = [right];\n exprs.push(throwNode);\n violation.replaceWith(t.sequenceExpression(exprs));\n } else if ([\"&&=\", \"||=\", \"??=\"].includes(operator)) {\n violation.replaceWith(\n t.logicalExpression(\n // @ts-expect-error todo: give a better type to operator\n operator.slice(0, -1),\n left,\n t.sequenceExpression([right, throwNode]),\n ),\n );\n } else {\n violation.replaceWith(\n t.sequenceExpression([\n t.binaryExpression(\n // @ts-expect-error todo: give a better type to operator\n operator.slice(0, -1),\n left,\n right,\n ),\n throwNode,\n ]),\n );\n }\n } else if (violation.isUpdateExpression()) {\n violation.replaceWith(\n t.sequenceExpression([\n t.unaryExpression(\"+\", violation.get(\"argument\").node),\n throwNode,\n ]),\n );\n } else if (violation.isForXStatement()) {\n violation.ensureBlock();\n violation\n .get(\"left\")\n .replaceWith(\n t.variableDeclaration(\"var\", [\n t.variableDeclarator(violation.scope.generateUidIdentifier(name)),\n ]),\n );\n violation.node.body.body.unshift(t.expressionStatement(throwNode));\n }\n }\n}\n\nfunction getTDZStatus(refPath: NodePath, bindingPath: NodePath) {\n const executionStatus = bindingPath._guessExecutionStatusRelativeTo(refPath);\n\n if (executionStatus === \"before\") {\n return \"outside\";\n } else if (executionStatus === \"after\") {\n return \"inside\";\n } else {\n return \"maybe\";\n }\n}\n\nconst skipTDZChecks = new WeakSet()
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