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MIT License
Copyright (c) 2014-present Sebastian McKenzie and other contributors
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# @babel/helper-wrap-function
> Helper to wrap functions inside a function call.
See our website [@babel/helper-wrap-function](https://babeljs.io/docs/babel-helper-wrap-function) for more information.
## Install
Using npm:
```sh
npm install --save @babel/helper-wrap-function
```
or using yarn:
```sh
yarn add @babel/helper-wrap-function
```
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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = wrapFunction;
var _template = require("@babel/template");
var _t = require("@babel/types");
const {
blockStatement,
callExpression,
functionExpression,
isAssignmentPattern,
isFunctionDeclaration,
isRestElement,
returnStatement,
isCallExpression,
memberExpression,
identifier,
thisExpression,
isPattern
} = _t;
const buildAnonymousExpressionWrapper = _template.default.expression(`
(function () {
var REF = FUNCTION;
return function NAME(PARAMS) {
return REF.apply(this, arguments);
};
})()
`);
const buildNamedExpressionWrapper = _template.default.expression(`
(function () {
var REF = FUNCTION;
function NAME(PARAMS) {
return REF.apply(this, arguments);
}
return NAME;
})()
`);
const buildDeclarationWrapper = _template.default.statements(`
function NAME(PARAMS) { return REF.apply(this, arguments); }
function REF() {
REF = FUNCTION;
return REF.apply(this, arguments);
}
`);
function classOrObjectMethod(path, callId, ignoreFunctionLength) {
const node = path.node;
const body = node.body;
let params = [];
const shouldForwardParams = node.params.some(p => isPattern(p));
if (shouldForwardParams) {
params = node.params;
node.params = [];
if (!ignoreFunctionLength) {
for (const param of params) {
if (isAssignmentPattern(param) || isRestElement(param)) {
break;
}
node.params.push(path.scope.generateUidIdentifier("x"));
}
}
}
const container = functionExpression(null, params, blockStatement(body.body), true);
if (shouldForwardParams) {
body.body = [returnStatement(callExpression(memberExpression(callExpression(callId, [container]), identifier("apply")), [thisExpression(), identifier("arguments")]))];
path.get("body.body.0.argument.callee.object.arguments.0").unwrapFunctionEnvironment();
} else {
body.body = [returnStatement(callExpression(callExpression(callId, [container]), []))];
path.get("body.body.0.argument.callee.arguments.0").unwrapFunctionEnvironment();
}
node.async = false;
node.generator = false;
}
function plainFunction(inPath, callId, noNewArrows, ignoreFunctionLength, hadName) {
let path = inPath;
let node;
let functionId = null;
const nodeParams = inPath.node.params;
if (path.isArrowFunctionExpression()) {
var _path$arrowFunctionTo;
path = (_path$arrowFunctionTo = path.arrowFunctionToExpression({
noNewArrows
})) != null ? _path$arrowFunctionTo : path;
node = path.node;
} else {
node = path.node;
}
const isDeclaration = isFunctionDeclaration(node);
let built = node;
if (!isCallExpression(node)) {
functionId = node.id;
node.id = null;
node.type = "FunctionExpression";
built = callExpression(callId, [node]);
}
const params = [];
for (const param of nodeParams) {
if (isAssignmentPattern(param) || isRestElement(param)) {
break;
}
params.push(path.scope.generateUidIdentifier("x"));
}
const wrapperArgs = {
NAME: functionId || null,
REF: path.scope.generateUidIdentifier(hadName ? functionId.name : "ref"),
FUNCTION: built,
PARAMS: params
};
if (isDeclaration) {
const container = buildDeclarationWrapper(wrapperArgs);
path.replaceWith(container[0]);
path.insertAfter(container[1]);
} else {
let container;
if (hadName) {
container = buildNamedExpressionWrapper(wrapperArgs);
} else {
container = buildAnonymousExpressionWrapper(wrapperArgs);
}
if (functionId || !ignoreFunctionLength && params.length) {
path.replaceWith(container);
} else {
path.replaceWith(built);
}
}
}
function wrapFunction(path, callId, noNewArrows = true, ignoreFunctionLength = false) {
if (path.isMethod()) {
classOrObjectMethod(path, callId, ignoreFunctionLength);
} else {
var _path, _path$ensureFunctionN;
const hadName = "id" in path.node && !!path.node.id;
(_path$ensureFunctionN = (_path = path).ensureFunctionName) != null ? _path$ensureFunctionN : _path.ensureFunctionName = require("@babel/traverse").NodePath.prototype.ensureFunctionName;
path = path.ensureFunctionName(false);
plainFunction(path, callId, noNewArrows, ignoreFunctionLength, hadName);
}
}
//# sourceMappingURL=index.js.map
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{"version":3,"names":["_template","require","_t","blockStatement","callExpression","functionExpression","isAssignmentPattern","isFunctionDeclaration","isRestElement","returnStatement","isCallExpression","memberExpression","identifier","thisExpression","isPattern","buildAnonymousExpressionWrapper","template","expression","buildNamedExpressionWrapper","buildDeclarationWrapper","statements","classOrObjectMethod","path","callId","ignoreFunctionLength","node","body","params","shouldForwardParams","some","p","param","push","scope","generateUidIdentifier","container","get","unwrapFunctionEnvironment","async","generator","plainFunction","inPath","noNewArrows","hadName","functionId","nodeParams","isArrowFunctionExpression","_path$arrowFunctionTo","arrowFunctionToExpression","isDeclaration","built","id","type","wrapperArgs","NAME","REF","name","FUNCTION","PARAMS","replaceWith","insertAfter","length","wrapFunction","isMethod","_path","_path$ensureFunctionN","ensureFunctionName","NodePath","prototype"],"sources":["../src/index.ts"],"sourcesContent":["import type { NodePath } from \"@babel/traverse\";\nimport template from \"@babel/template\";\nimport {\n blockStatement,\n callExpression,\n functionExpression,\n isAssignmentPattern,\n isFunctionDeclaration,\n isRestElement,\n returnStatement,\n isCallExpression,\n memberExpression,\n identifier,\n thisExpression,\n isPattern,\n} from \"@babel/types\";\nimport type * as t from \"@babel/types\";\n\ntype ExpressionWrapperBuilder<ExtraBody extends t.Node[]> = (\n replacements?: Parameters<ReturnType<typeof template.expression>>[0],\n) => t.CallExpression & {\n callee: t.FunctionExpression & {\n body: {\n body: [\n t.VariableDeclaration & {\n declarations: [\n { init: t.FunctionExpression | t.ArrowFunctionExpression },\n ];\n },\n ...ExtraBody,\n ];\n };\n };\n};\n\nconst buildAnonymousExpressionWrapper = template.expression(`\n (function () {\n var REF = FUNCTION;\n return function NAME(PARAMS) {\n return REF.apply(this, arguments);\n };\n })()\n`) as ExpressionWrapperBuilder<\n [t.ReturnStatement & { argument: t.FunctionExpression }]\n>;\n\nconst buildNamedExpressionWrapper = template.expression(`\n (function () {\n var REF = FUNCTION;\n function NAME(PARAMS) {\n return REF.apply(this, arguments);\n }\n return NAME;\n })()\n`) as ExpressionWrapperBuilder<\n [t.FunctionDeclaration, t.ReturnStatement & { argument: t.Identifier }]\n>;\n\nconst buildDeclarationWrapper = template.statements(`\n function NAME(PARAMS) { return REF.apply(this, arguments); }\n function REF() {\n REF = FUNCTION;\n return REF.apply(this, arguments);\n }\n`);\n\nfunction classOrObjectMethod(\n path: NodePath<t.ClassMethod | t.ClassPrivateMethod | t.ObjectMethod>,\n callId: t.Expression,\n ignoreFunctionLength: boolean,\n) {\n const node = path.node;\n const body = node.body;\n\n let params: (t.Identifier | t.Pattern | t.RestElement)[] = [];\n\n // Errors thrown during argument evaluation must reject the resulting promise\n const shouldForwardParams = node.params.some(p => isPattern(p));\n\n if (shouldForwardParams) {\n params = node.params as typeof params;\n node.params = [];\n if (!ignoreFunctionLength) {\n for (const param of params) {\n if (isAssignmentPattern(param) || isRestElement(param)) {\n break;\n }\n node.params.push(path.scope.generateUidIdentifier(\"x\"));\n }\n }\n }\n\n const container = functionExpression(\n null,\n params,\n blockStatement(body.body),\n true,\n );\n\n if (shouldForwardParams) {\n // return asyncToGenerator(function*() { ... }).apply(this, arguments);\n body.body = [\n returnStatement(\n callExpression(\n memberExpression(\n callExpression(callId, [container]),\n identifier(\"apply\"),\n ),\n [thisExpression(), identifier(\"arguments\")],\n ),\n ),\n ];\n\n (\n path.get(\"body.body.0.argument.callee.object.arguments.0\") as NodePath\n ).unwrapFunctionEnvironment();\n } else {\n // return asyncToGenerator(function*() { ... })();\n body.body = [\n returnStatement(callExpression(callExpression(callId, [container]), [])),\n ];\n\n // Unwrap the wrapper IIFE's environment so super and this and such still work.\n (\n path.get(\"body.body.0.argument.callee.arguments.0\") as NodePath\n ).unwrapFunctionEnvironment();\n }\n\n // Regardless of whether or not the wrapped function is a an async method\n // or generator the outer function should not be\n node.async = false;\n node.generator = false;\n}\n\nfunction plainFunction(\n inPath: NodePath<Exclude<t.Function, t.Method>>,\n callId: t.Expression,\n noNewArrows: boolean,\n ignoreFunctionLength: boolean,\n hadName: boolean,\n) {\n let path: NodePath<\n | t.FunctionDeclaration\n | t.FunctionLine truncated
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{
"name": "@babel/helper-wrap-function",
"version": "7.29.7",
"description": "Helper to wrap functions inside a function call.",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-helper-wrap-function"
},
"homepage": "https://babel.dev/docs/en/next/babel-helper-wrap-function",
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "./lib/index.js",
"dependencies": {
"@babel/template": "^7.29.7",
"@babel/traverse": "^7.29.7",
"@babel/types": "^7.29.7"
},
"engines": {
"node": ">=6.9.0"
},
"author": "The Babel Team (https://babel.dev/team)",
"type": "commonjs"
}