0.2.0 - Mid migration

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Daniel Mason 2022-04-25 14:47:15 +12:00
parent 139e6a915e
commit 7e38fdbd7d
42393 changed files with 5358157 additions and 62 deletions

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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/plugin-transform-parameters
> Compile ES2015 default and rest parameters to ES5
See our website [@babel/plugin-transform-parameters](https://babeljs.io/docs/en/babel-plugin-transform-parameters) for more information.
## Install
Using npm:
```sh
npm install --save-dev @babel/plugin-transform-parameters
```
or using yarn:
```sh
yarn add @babel/plugin-transform-parameters --dev
```

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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "convertFunctionParams", {
enumerable: true,
get: function () {
return _params.default;
}
});
exports.default = void 0;
var _helperPluginUtils = require("@babel/helper-plugin-utils");
var _params = require("./params");
var _rest = require("./rest");
var _default = (0, _helperPluginUtils.declare)((api, options) => {
var _api$assumption;
api.assertVersion(7);
const ignoreFunctionLength = (_api$assumption = api.assumption("ignoreFunctionLength")) != null ? _api$assumption : options.loose;
const noNewArrows = api.assumption("noNewArrows");
return {
name: "transform-parameters",
visitor: {
Function(path) {
if (path.isArrowFunctionExpression() && path.get("params").some(param => param.isRestElement() || param.isAssignmentPattern())) {
path.arrowFunctionToExpression({
noNewArrows
});
}
const convertedRest = (0, _rest.default)(path);
const convertedParams = (0, _params.default)(path, ignoreFunctionLength);
if (convertedRest || convertedParams) {
path.scope.crawl();
}
}
}
};
});
exports.default = _default;

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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = convertFunctionParams;
var _core = require("@babel/core");
const buildDefaultParam = (0, _core.template)(`
let VARIABLE_NAME =
arguments.length > ARGUMENT_KEY && arguments[ARGUMENT_KEY] !== undefined ?
arguments[ARGUMENT_KEY]
:
DEFAULT_VALUE;
`);
const buildLooseDefaultParam = (0, _core.template)(`
if (ASSIGNMENT_IDENTIFIER === UNDEFINED) {
ASSIGNMENT_IDENTIFIER = DEFAULT_VALUE;
}
`);
const buildLooseDestructuredDefaultParam = (0, _core.template)(`
let ASSIGNMENT_IDENTIFIER = PARAMETER_NAME === UNDEFINED ? DEFAULT_VALUE : PARAMETER_NAME ;
`);
const buildSafeArgumentsAccess = (0, _core.template)(`
let $0 = arguments.length > $1 ? arguments[$1] : undefined;
`);
const iifeVisitor = {
"ReferencedIdentifier|BindingIdentifier"(path, state) {
const {
scope,
node
} = path;
const {
name
} = node;
if (name === "eval" || scope.getBinding(name) === state.scope.parent.getBinding(name) && state.scope.hasOwnBinding(name)) {
state.needsOuterBinding = true;
path.stop();
}
},
"TypeAnnotation|TSTypeAnnotation|TypeParameterDeclaration|TSTypeParameterDeclaration": path => path.skip()
};
function convertFunctionParams(path, ignoreFunctionLength, shouldTransformParam, replaceRestElement) {
const params = path.get("params");
const isSimpleParameterList = params.every(param => param.isIdentifier());
if (isSimpleParameterList) return false;
const {
node,
scope
} = path;
const state = {
stop: false,
needsOuterBinding: false,
scope
};
const body = [];
const shadowedParams = new Set();
for (const param of params) {
for (const name of Object.keys(param.getBindingIdentifiers())) {
var _scope$bindings$name;
const constantViolations = (_scope$bindings$name = scope.bindings[name]) == null ? void 0 : _scope$bindings$name.constantViolations;
if (constantViolations) {
for (const redeclarator of constantViolations) {
const node = redeclarator.node;
switch (node.type) {
case "VariableDeclarator":
{
if (node.init === null) {
const declaration = redeclarator.parentPath;
if (!declaration.parentPath.isFor() || declaration.parentPath.get("body") === declaration) {
redeclarator.remove();
break;
}
}
shadowedParams.add(name);
break;
}
case "FunctionDeclaration":
shadowedParams.add(name);
break;
}
}
}
}
}
if (shadowedParams.size === 0) {
for (const param of params) {
if (!param.isIdentifier()) param.traverse(iifeVisitor, state);
if (state.needsOuterBinding) break;
}
}
let firstOptionalIndex = null;
for (let i = 0; i < params.length; i++) {
const param = params[i];
if (shouldTransformParam && !shouldTransformParam(i)) {
continue;
}
const transformedRestNodes = [];
if (replaceRestElement) {
replaceRestElement(param.parentPath, param, transformedRestNodes);
}
const paramIsAssignmentPattern = param.isAssignmentPattern();
if (paramIsAssignmentPattern && (ignoreFunctionLength || node.kind === "set")) {
const left = param.get("left");
const right = param.get("right");
const undefinedNode = scope.buildUndefinedNode();
if (left.isIdentifier()) {
body.push(buildLooseDefaultParam({
ASSIGNMENT_IDENTIFIER: _core.types.cloneNode(left.node),
DEFAULT_VALUE: right.node,
UNDEFINED: undefinedNode
}));
param.replaceWith(left.node);
} else if (left.isObjectPattern() || left.isArrayPattern()) {
const paramName = scope.generateUidIdentifier();
body.push(buildLooseDestructuredDefaultParam({
ASSIGNMENT_IDENTIFIER: left.node,
DEFAULT_VALUE: right.node,
PARAMETER_NAME: _core.types.cloneNode(paramName),
UNDEFINED: undefinedNode
}));
param.replaceWith(paramName);
}
} else if (paramIsAssignmentPattern) {
if (firstOptionalIndex === null) firstOptionalIndex = i;
const left = param.get("left");
const right = param.get("right");
const defNode = buildDefaultParam({
VARIABLE_NAME: left.node,
DEFAULT_VALUE: right.node,
ARGUMENT_KEY: _core.types.numericLiteral(i)
});
body.push(defNode);
} else if (firstOptionalIndex !== null) {
const defNode = buildSafeArgumentsAccess([param.node, _core.types.numericLiteral(i)]);
body.push(defNode);
} else if (param.isObjectPattern() || param.isArrayPattern()) {
const uid = path.scope.generateUidIdentifier("ref");
const defNode = _core.types.variableDeclaration("let", [_core.types.variableDeclarator(param.node, uid)]);
body.push(defNode);
param.replaceWith(_core.types.cloneNode(uid));
}
if (transformedRestNodes) {
for (const transformedNode of transformedRestNodes) {
body.push(transformedNode);
}
}
}
if (firstOptionalIndex !== null) {
node.params = node.params.slice(0, firstOptionalIndex);
}
path.ensureBlock();
if (state.needsOuterBinding || shadowedParams.size > 0) {
body.push(buildScopeIIFE(shadowedParams, path.get("body").node));
path.set("body", _core.types.blockStatement(body));
const bodyPath = path.get("body.body");
const arrowPath = bodyPath[bodyPath.length - 1].get("argument.callee");
arrowPath.arrowFunctionToExpression();
arrowPath.node.generator = path.node.generator;
arrowPath.node.async = path.node.async;
path.node.generator = false;
} else {
path.get("body").unshiftContainer("body", body);
}
return true;
}
function buildScopeIIFE(shadowedParams, body) {
const args = [];
const params = [];
for (const name of shadowedParams) {
args.push(_core.types.identifier(name));
params.push(_core.types.identifier(name));
}
return _core.types.returnStatement(_core.types.callExpression(_core.types.arrowFunctionExpression(params, body), args));
}

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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = convertFunctionRest;
var _core = require("@babel/core");
const buildRest = (0, _core.template)(`
for (var LEN = ARGUMENTS.length,
ARRAY = new Array(ARRAY_LEN),
KEY = START;
KEY < LEN;
KEY++) {
ARRAY[ARRAY_KEY] = ARGUMENTS[KEY];
}
`);
const restIndex = (0, _core.template)(`
(INDEX < OFFSET || ARGUMENTS.length <= INDEX) ? undefined : ARGUMENTS[INDEX]
`);
const restIndexImpure = (0, _core.template)(`
REF = INDEX, (REF < OFFSET || ARGUMENTS.length <= REF) ? undefined : ARGUMENTS[REF]
`);
const restLength = (0, _core.template)(`
ARGUMENTS.length <= OFFSET ? 0 : ARGUMENTS.length - OFFSET
`);
function referencesRest(path, state) {
if (path.node.name === state.name) {
return path.scope.bindingIdentifierEquals(state.name, state.outerBinding);
}
return false;
}
const memberExpressionOptimisationVisitor = {
Scope(path, state) {
if (!path.scope.bindingIdentifierEquals(state.name, state.outerBinding)) {
path.skip();
}
},
Flow(path) {
if (path.isTypeCastExpression()) return;
path.skip();
},
Function(path, state) {
const oldNoOptimise = state.noOptimise;
state.noOptimise = true;
path.traverse(memberExpressionOptimisationVisitor, state);
state.noOptimise = oldNoOptimise;
path.skip();
},
ReferencedIdentifier(path, state) {
const {
node
} = path;
if (node.name === "arguments") {
state.deopted = true;
}
if (!referencesRest(path, state)) return;
if (state.noOptimise) {
state.deopted = true;
} else {
const {
parentPath
} = path;
if (parentPath.listKey === "params" && parentPath.key < state.offset) {
return;
}
if (parentPath.isMemberExpression({
object: node
})) {
const grandparentPath = parentPath.parentPath;
const argsOptEligible = !state.deopted && !(grandparentPath.isAssignmentExpression() && parentPath.node === grandparentPath.node.left || grandparentPath.isLVal() || grandparentPath.isForXStatement() || grandparentPath.isUpdateExpression() || grandparentPath.isUnaryExpression({
operator: "delete"
}) || (grandparentPath.isCallExpression() || grandparentPath.isNewExpression()) && parentPath.node === grandparentPath.node.callee);
if (argsOptEligible) {
if (parentPath.node.computed) {
if (parentPath.get("property").isBaseType("number")) {
state.candidates.push({
cause: "indexGetter",
path
});
return;
}
} else if (parentPath.node.property.name === "length") {
state.candidates.push({
cause: "lengthGetter",
path
});
return;
}
}
}
if (state.offset === 0 && parentPath.isSpreadElement()) {
const call = parentPath.parentPath;
if (call.isCallExpression() && call.node.arguments.length === 1) {
state.candidates.push({
cause: "argSpread",
path
});
return;
}
}
state.references.push(path);
}
},
BindingIdentifier(path, state) {
if (referencesRest(path, state)) {
state.deopted = true;
}
}
};
function getParamsCount(node) {
let count = node.params.length;
if (count > 0 && _core.types.isIdentifier(node.params[0], {
name: "this"
})) {
count -= 1;
}
return count;
}
function hasRest(node) {
const length = node.params.length;
return length > 0 && _core.types.isRestElement(node.params[length - 1]);
}
function optimiseIndexGetter(path, argsId, offset) {
const offsetLiteral = _core.types.numericLiteral(offset);
let index;
if (_core.types.isNumericLiteral(path.parent.property)) {
index = _core.types.numericLiteral(path.parent.property.value + offset);
} else if (offset === 0) {
index = path.parent.property;
} else {
index = _core.types.binaryExpression("+", path.parent.property, _core.types.cloneNode(offsetLiteral));
}
const {
scope
} = path;
if (!scope.isPure(index)) {
const temp = scope.generateUidIdentifierBasedOnNode(index);
scope.push({
id: temp,
kind: "var"
});
path.parentPath.replaceWith(restIndexImpure({
ARGUMENTS: argsId,
OFFSET: offsetLiteral,
INDEX: index,
REF: _core.types.cloneNode(temp)
}));
} else {
const parentPath = path.parentPath;
parentPath.replaceWith(restIndex({
ARGUMENTS: argsId,
OFFSET: offsetLiteral,
INDEX: index
}));
const offsetTestPath = parentPath.get("test").get("left");
const valRes = offsetTestPath.evaluate();
if (valRes.confident) {
if (valRes.value === true) {
parentPath.replaceWith(parentPath.scope.buildUndefinedNode());
} else {
parentPath.get("test").replaceWith(parentPath.get("test").get("right"));
}
}
}
}
function optimiseLengthGetter(path, argsId, offset) {
if (offset) {
path.parentPath.replaceWith(restLength({
ARGUMENTS: argsId,
OFFSET: _core.types.numericLiteral(offset)
}));
} else {
path.replaceWith(argsId);
}
}
function convertFunctionRest(path) {
const {
node,
scope
} = path;
if (!hasRest(node)) return false;
let rest = node.params.pop().argument;
const argsId = _core.types.identifier("arguments");
if (_core.types.isPattern(rest)) {
const pattern = rest;
rest = scope.generateUidIdentifier("ref");
const declar = _core.types.variableDeclaration("let", [_core.types.variableDeclarator(pattern, rest)]);
node.body.body.unshift(declar);
}
const paramsCount = getParamsCount(node);
const state = {
references: [],
offset: paramsCount,
argumentsNode: argsId,
outerBinding: scope.getBindingIdentifier(rest.name),
candidates: [],
name: rest.name,
deopted: false
};
path.traverse(memberExpressionOptimisationVisitor, state);
if (!state.deopted && !state.references.length) {
for (const {
path,
cause
} of state.candidates) {
const clonedArgsId = _core.types.cloneNode(argsId);
switch (cause) {
case "indexGetter":
optimiseIndexGetter(path, clonedArgsId, state.offset);
break;
case "lengthGetter":
optimiseLengthGetter(path, clonedArgsId, state.offset);
break;
default:
path.replaceWith(clonedArgsId);
}
}
return true;
}
state.references = state.references.concat(state.candidates.map(({
path
}) => path));
const start = _core.types.numericLiteral(paramsCount);
const key = scope.generateUidIdentifier("key");
const len = scope.generateUidIdentifier("len");
let arrKey, arrLen;
if (paramsCount) {
arrKey = _core.types.binaryExpression("-", _core.types.cloneNode(key), _core.types.cloneNode(start));
arrLen = _core.types.conditionalExpression(_core.types.binaryExpression(">", _core.types.cloneNode(len), _core.types.cloneNode(start)), _core.types.binaryExpression("-", _core.types.cloneNode(len), _core.types.cloneNode(start)), _core.types.numericLiteral(0));
} else {
arrKey = _core.types.identifier(key.name);
arrLen = _core.types.identifier(len.name);
}
const loop = buildRest({
ARGUMENTS: argsId,
ARRAY_KEY: arrKey,
ARRAY_LEN: arrLen,
START: start,
ARRAY: rest,
KEY: key,
LEN: len
});
if (state.deopted) {
node.body.body.unshift(loop);
} else {
let target = path.getEarliestCommonAncestorFrom(state.references).getStatementParent();
target.findParent(path => {
if (path.isLoop()) {
target = path;
} else {
return path.isFunction();
}
});
target.insertBefore(loop);
}
return true;
}

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{
"name": "@babel/plugin-transform-parameters",
"version": "7.14.5",
"description": "Compile ES2015 default and rest parameters to ES5",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-plugin-transform-parameters"
},
"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-parameters",
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "./lib/index.js",
"dependencies": {
"@babel/helper-plugin-utils": "^7.14.5"
},
"keywords": [
"babel-plugin"
],
"peerDependencies": {
"@babel/core": "^7.0.0-0"
},
"devDependencies": {
"@babel/core": "7.14.5",
"@babel/helper-plugin-test-runner": "7.14.5"
},
"engines": {
"node": ">=6.9.0"
},
"author": "The Babel Team (https://babel.dev/team)"
}