@babel/plugin-proposal-function-sent/lib/index.js

Compile the function.sent meta property to valid ES2015 code

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _helperPluginUtils = require("@babel/helper-plugin-utils");
var _helperWrapFunction = require("@babel/helper-wrap-function");
var _core = require("@babel/core");
var _default = exports.default = (0, _helperPluginUtils.declare)(api => {
  api.assertVersion(7);
  const isFunctionSent = node => _core.types.isIdentifier(node.meta, {
    name: "function"
  }) && _core.types.isIdentifier(node.property, {
    name: "sent"
  });
  const hasBeenReplaced = (node, sentId) => _core.types.isAssignmentExpression(node) && _core.types.isIdentifier(node.left, {
    name: sentId
  });
  const yieldVisitor = {
    Function(path) {
      path.skip();
    },
    YieldExpression(path) {
      if (!hasBeenReplaced(path.parent, this.sentId)) {
        path.replaceWith(_core.types.assignmentExpression("=", _core.types.identifier(this.sentId), path.node));
      }
    },
    MetaProperty(path) {
      if (isFunctionSent(path.node)) {
        path.replaceWith(_core.types.identifier(this.sentId));
      }
    }
  };
  return {
    name: "proposal-function-sent",
    manipulateOptions: (_, parser) => parser.plugins.push("functionSent"),
    visitor: {
      MetaProperty(path, state) {
        if (!isFunctionSent(path.node)) return;
        const fnPath = path.getFunctionParent();
        if (!fnPath.node.generator) {
          throw new Error("Parent generator function not found");
        }
        const sentId = path.scope.generateUid("function.sent");
        fnPath.traverse(yieldVisitor, {
          sentId
        });
        fnPath.node.body.body.unshift(_core.types.variableDeclaration("let", [_core.types.variableDeclarator(_core.types.identifier(sentId), _core.types.yieldExpression())]));
        (0, _helperWrapFunction.default)(fnPath, state.addHelper("skipFirstGeneratorNext"));
      }
    }
  };
});

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