index.js
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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _helperPluginUtils = require("@babel/helper-plugin-utils");
var _core = require("@babel/core");
var _default = (0, _helperPluginUtils.declare)((api, options) => {
api.assertVersion(7);
const {
loose
} = options;
function getSpreadLiteral(spread, scope) {
if (loose && !_core.types.isIdentifier(spread.argument, {
name: "arguments"
})) {
return spread.argument;
} else {
return scope.toArray(spread.argument, true);
}
}
function hasSpread(nodes) {
for (let i = 0; i < nodes.length; i++) {
if (_core.types.isSpreadElement(nodes[i])) {
return true;
}
}
return false;
}
function push(_props, nodes) {
if (!_props.length) return _props;
nodes.push(_core.types.arrayExpression(_props));
return [];
}
function build(props, scope) {
const nodes = [];
let _props = [];
for (const prop of props) {
if (_core.types.isSpreadElement(prop)) {
_props = push(_props, nodes);
nodes.push(getSpreadLiteral(prop, scope));
} else {
_props.push(prop);
}
}
push(_props, nodes);
return nodes;
}
return {
name: "transform-spread",
visitor: {
ArrayExpression(path) {
const {
node,
scope
} = path;
const elements = node.elements;
if (!hasSpread(elements)) return;
const nodes = build(elements, scope);
let first = nodes[0];
if (nodes.length === 1 && first !== elements[0].argument) {
path.replaceWith(first);
return;
}
if (!_core.types.isArrayExpression(first)) {
first = _core.types.arrayExpression([]);
} else {
nodes.shift();
}
path.replaceWith(_core.types.callExpression(_core.types.memberExpression(first, _core.types.identifier("concat")), nodes));
},
CallExpression(path) {
const {
node,
scope
} = path;
const args = node.arguments;
if (!hasSpread(args)) return;
const calleePath = path.get("callee");
if (calleePath.isSuper()) return;
let contextLiteral = scope.buildUndefinedNode();
node.arguments = [];
let nodes;
if (args.length === 1 && args[0].argument.name === "arguments") {
nodes = [args[0].argument];
} else {
nodes = build(args, scope);
}
const first = nodes.shift();
if (nodes.length) {
node.arguments.push(_core.types.callExpression(_core.types.memberExpression(first, _core.types.identifier("concat")), nodes));
} else {
node.arguments.push(first);
}
const callee = node.callee;
if (calleePath.isMemberExpression()) {
const temp = scope.maybeGenerateMemoised(callee.object);
if (temp) {
callee.object = _core.types.assignmentExpression("=", temp, callee.object);
contextLiteral = temp;
} else {
contextLiteral = _core.types.cloneNode(callee.object);
}
_core.types.appendToMemberExpression(callee, _core.types.identifier("apply"));
} else {
node.callee = _core.types.memberExpression(node.callee, _core.types.identifier("apply"));
}
if (_core.types.isSuper(contextLiteral)) {
contextLiteral = _core.types.thisExpression();
}
node.arguments.unshift(_core.types.cloneNode(contextLiteral));
},
NewExpression(path) {
const {
node,
scope
} = path;
let args = node.arguments;
if (!hasSpread(args)) return;
const nodes = build(args, scope);
const first = nodes.shift();
if (nodes.length) {
args = _core.types.callExpression(_core.types.memberExpression(first, _core.types.identifier("concat")), nodes);
} else {
args = first;
}
path.replaceWith(_core.types.callExpression(path.hub.addHelper("construct"), [node.callee, args]));
}
}
};
});
exports.default = _default;