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14 KiB
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{"version":3,"names":["NOT_LOCAL_BINDING","cloneNode","identifier","isAssignmentExpression","isAssignmentPattern","isFunction","isIdentifier","isLiteral","isNullLiteral","isObjectMethod","isObjectProperty","isRegExpLiteral","isRestElement","isTemplateLiteral","isVariableDeclarator","toBindingIdentifierName","getFunctionArity","node","count","params","findIndex","param","length","buildPropertyMethodAssignmentWrapper","template","statement","buildGeneratorPropertyMethodAssignmentWrapper","visitor","path","state","name","localDeclar","scope","getBindingIdentifier","outerDeclar","selfReference","stop","getNameFromLiteralId","id","pattern","flags","quasis","map","quasi","value","raw","join","undefined","wrap","method","hasBinding","hasGlobal","rename","build","generator","FUNCTION","FUNCTION_ID","FUNCTION_KEY","generateUidIdentifier","expression","callee","body","i","len","push","getProgramParent","references","visit","selfAssignment","binding","getOwnBinding","kind","traverse","parent","localBinding","supportUnicodeId","computed","key","getBinding","constant","operator","left","test","newId"],"sources":["../src/index.ts"],"sourcesContent":["import template from \"@babel/template\";\nimport {\n NOT_LOCAL_BINDING,\n cloneNode,\n identifier,\n isAssignmentExpression,\n isAssignmentPattern,\n isFunction,\n isIdentifier,\n isLiteral,\n isNullLiteral,\n isObjectMethod,\n isObjectProperty,\n isRegExpLiteral,\n isRestElement,\n isTemplateLiteral,\n isVariableDeclarator,\n toBindingIdentifierName,\n} from \"@babel/types\";\nimport type * as t from \"@babel/types\";\nimport type { NodePath, Scope, Visitor } from \"@babel/traverse\";\n\nfunction getFunctionArity(node: t.Function): number {\n const count = node.params.findIndex(\n param => isAssignmentPattern(param) || isRestElement(param),\n );\n return count === -1 ? node.params.length : count;\n}\n\nconst buildPropertyMethodAssignmentWrapper = template.statement(`\n (function (FUNCTION_KEY) {\n function FUNCTION_ID() {\n return FUNCTION_KEY.apply(this, arguments);\n }\n\n FUNCTION_ID.toString = function () {\n return FUNCTION_KEY.toString();\n }\n\n return FUNCTION_ID;\n })(FUNCTION)\n`);\n\nconst buildGeneratorPropertyMethodAssignmentWrapper = template.statement(`\n (function (FUNCTION_KEY) {\n function* FUNCTION_ID() {\n return yield* FUNCTION_KEY.apply(this, arguments);\n }\n\n FUNCTION_ID.toString = function () {\n return FUNCTION_KEY.toString();\n };\n\n return FUNCTION_ID;\n })(FUNCTION)\n`);\n\ntype State = {\n name: string;\n outerDeclar: t.Identifier;\n selfAssignment: boolean;\n selfReference: boolean;\n};\n\nconst visitor: Visitor<State> = {\n \"ReferencedIdentifier|BindingIdentifier\"(\n path: NodePath<t.Identifier>,\n state,\n ) {\n // check if this node matches our function id\n if (path.node.name !== state.name) return;\n\n // check that we don't have a local variable declared as that removes the need\n // for the wrapper\n const localDeclar = path.scope.getBindingIdentifier(state.name);\n if (localDeclar !== state.outerDeclar) return;\n\n state.selfReference = true;\n path.stop();\n },\n};\n\nfunction getNameFromLiteralId(id: t.Literal) {\n if (isNullLiteral(id)) {\n return \"null\";\n }\n\n if (isRegExpLiteral(id)) {\n return `_${id.pattern}_${id.flags}`;\n }\n\n if (isTemplateLiteral(id)) {\n return id.quasis.map(quasi => quasi.value.raw).join(\"\");\n }\n\n if (id.value !== undefined) {\n return id.value + \"\";\n }\n\n return \"\";\n}\n\nfunction wrap(\n state: State,\n method: t.FunctionExpression | t.Class,\n id: t.Identifier,\n scope: Scope,\n) {\n if (state.selfReference) {\n if (scope.hasBinding(id.name) && !scope.hasGlobal(id.name)) {\n // we can just munge the local binding\n scope.rename(id.name);\n } else {\n // we don't currently support wrapping class expressions\n if (!isFunction(method)) return;\n\n // need to add a wrapper since we can't change the references\n let build = buildPropertyMethodAssignmentWrapper;\n if (method.generator) {\n build = buildGeneratorPropertyMethodAssignmentWrapper;\n }\n\n const template = (\n build({\n FUNCTION: method,\n FUNCTION_ID: id,\n FUNCTION_KEY: scope.generateUidIdentifier(id.name),\n }) as t.ExpressionStatement\n ).expression as t.CallExpression;\n\n // shim in dummy params to retain function arity, if you try to read the\n // source then you'll get the original since it's proxied so it's all good\n const params = (\n (template.callee as t.FunctionExpression).body\n .body[0] as any as t.FunctionExpression\n ).params;\n\n for (let i = 0, len = getFunctionArity(method); i < len; i++) {\n params.push(scope.generateUidIdentifier(\"x\"));\n }\n\n return template;\n }\n }\n\n method.id = id;\n scope.getProgramParent().references[id.name] = true;\n}\n\nfunction visit(\n node: t.FunctionExpression | t.Class,\n name: string,\n scope: Scope,\n) {\n const state: State = {\n selfAssignment: false,\n selfReference: false,\n outerDeclar: scope.getBindingIdentifier(name),\n name: name,\n };\n\n // check to see if we have a local binding of the id we're setting inside of\n // the function, this is important as there are caveats associated\n\n const binding = scope.getOwnBinding(name);\n\n if (binding) {\n if (binding.kind === \"param\") {\n // safari will blow up in strict mode with code like:\n //\n // let t = function t(t) {};\n //\n // with the error:\n //\n // Cannot declare a parameter named 't' as it shadows the name of a\n // strict mode function.\n //\n // this isn't to the spec and they've invented this behaviour which is\n // **extremely** annoying so we avoid setting the name if it has a param\n // with the same id\n state.selfReference = true;\n } else {\n // otherwise it's defined somewhere in scope like:\n //\n // let t = function () {\n // let t = 2;\n // };\n //\n // so we can safely just set the id and move along as it shadows the\n // bound function id\n }\n } else if (state.outerDeclar || scope.hasGlobal(name)) {\n scope.traverse(node, visitor, state);\n }\n\n return state;\n}\n\n/**\n * Add id to function/class expression inferred from the AST\n *\n * @export\n * @template N The unamed expression type\n * @param {Object} nodePathLike The NodePath-like input\n * @param {N} nodePathLike.node an AST node\n * @param {NodePath<N>[\"parent\"]} [nodePathLike.parent] The parent of the AST node\n * @param {Scope} nodePathLike.scope The scope associated to the AST node\n * @param {t.LVal | t.StringLiteral | t.NumericLiteral | t.BigIntLiteral} [nodePathLike.id] the fallback naming source when the helper\n * can not infer the function name from the AST\n * @param {boolean} [localBinding=false] whether a name could shadow a self-reference (e.g. converting arrow function)\n * @param {boolean} [supportUnicodeId=false] whether the compilation target supports unicodeId (non-BMP characters) or not\n * @returns {(N | t.CallExpression | void)}\n * - modified node when name can be inferred,\n * - an IIFE when `node` contains a binding shadowing the inferred function name (e.g. `let f = function (f) {}`),\n * - `void` when `node` has `id` property or the helper can not inferred the name or the inferred name contains non-BMP characters that is not supported by current target\n */\nexport default function <N extends t.FunctionExpression | t.Class>(\n {\n node,\n parent,\n scope,\n id,\n }: {\n node: N;\n parent?: NodePath<N>[\"parent\"];\n scope: Scope;\n id?: t.LVal | t.StringLiteral | t.NumericLiteral | t.BigIntLiteral;\n },\n localBinding = false,\n supportUnicodeId = false,\n): N | t.CallExpression | void {\n // has an `id` so we don't need to infer one\n if (node.id) return;\n\n if (\n (isObjectProperty(parent) || isObjectMethod(parent, { kind: \"method\" })) &&\n (!parent.computed || isLiteral(parent.key))\n ) {\n // { foo() {} };\n id = parent.key as\n | t.Identifier\n | t.StringLiteral\n | t.NumericLiteral\n | t.BigIntLiteral;\n } else if (isVariableDeclarator(parent)) {\n // let foo = function () {};\n id = parent.id;\n\n // but not \"let foo = () => {};\" being converted to function expression\n if (isIdentifier(id) && !localBinding) {\n const binding = scope.parent.getBinding(id.name);\n if (\n binding &&\n binding.constant &&\n scope.getBinding(id.name) === binding\n ) {\n // always going to reference this method\n node.id = cloneNode(id);\n // @ts-expect-error Fixme: avoid mutating AST nodes\n node.id[NOT_LOCAL_BINDING] = true;\n return;\n }\n }\n } else if (isAssignmentExpression(parent, { operator: \"=\" })) {\n // foo = function () {};\n id = parent.left;\n } else if (!id) {\n return;\n }\n\n let name;\n if (id && isLiteral(id)) {\n name = getNameFromLiteralId(id);\n } else if (id && isIdentifier(id)) {\n name = id.name;\n }\n\n if (name === undefined) {\n return;\n }\n\n if (!supportUnicodeId && isFunction(node) && /[\\uD800-\\uDFFF]/.test(name)) {\n return;\n }\n\n name = toBindingIdentifierName(name);\n const newId = identifier(name);\n\n // The id shouldn't be considered a local binding to the function because\n // we are simply trying to set the function name and not actually create\n // a local binding.\n // @ts-expect-error Fixme: avoid mutating AST nodes\n newId[NOT_LOCAL_BINDING] = true;\n\n const state = visit(node, name, scope);\n return wrap(state, node, newId, scope) || 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