You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.2 KiB
58 lines
1.2 KiB
3 years ago
|
"use strict";
|
||
|
|
|
||
|
|
Object.defineProperty(exports, "__esModule", {
|
||
|
|
value: true
|
||
|
|
});
|
||
|
|
exports.default = hoistVariables;
|
||
|
|
|
||
|
|
var _t = require("@babel/types");
|
||
|
|
|
||
|
|
const {
|
||
|
|
assignmentExpression,
|
||
|
|
expressionStatement,
|
||
|
|
identifier
|
||
|
|
} = _t;
|
||
|
|
const visitor = {
|
||
|
|
Scope(path, state) {
|
||
|
|
if (state.kind === "let") path.skip();
|
||
|
|
},
|
||
|
|
|
||
|
|
FunctionParent(path) {
|
||
|
|
path.skip();
|
||
|
|
},
|
||
|
|
|
||
|
|
VariableDeclaration(path, state) {
|
||
|
|
if (state.kind && path.node.kind !== state.kind) return;
|
||
|
|
const nodes = [];
|
||
|
|
const declarations = path.get("declarations");
|
||
|
|
let firstId;
|
||
|
|
|
||
|
|
for (const declar of declarations) {
|
||
|
|
firstId = declar.node.id;
|
||
|
|
|
||
|
|
if (declar.node.init) {
|
||
|
|
nodes.push(expressionStatement(assignmentExpression("=", declar.node.id, declar.node.init)));
|
||
|
|
}
|
||
|
|
|
||
|
|
for (const name of Object.keys(declar.getBindingIdentifiers())) {
|
||
|
|
state.emit(identifier(name), name, declar.node.init !== null);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (path.parentPath.isFor({
|
||
|
|
left: path.node
|
||
|
|
})) {
|
||
|
|
path.replaceWith(firstId);
|
||
|
|
} else {
|
||
|
|
path.replaceWithMultiple(nodes);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
function hoistVariables(path, emit, kind = "var") {
|
||
|
|
path.traverse(visitor, {
|
||
|
|
kind,
|
||
|
|
emit
|
||
|
|
});
|
||
|
|
}
|