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

Compile the function.sent meta property to valid ES2015 code

import { declare } from '@babel/helper-plugin-utils';
import wrapFunction from '@babel/helper-wrap-function';
import { types } from '@babel/core';

const index = declare(api => {
  api.assertVersion("^7.0.0-0 || ^8.0.0");
  const isFunctionSent = node => types.isIdentifier(node.meta, {
    name: "function"
  }) && types.isIdentifier(node.property, {
    name: "sent"
  });
  const hasBeenReplaced = (node, sentId) => types.isAssignmentExpression(node) && types.isIdentifier(node.left, {
    name: sentId
  });
  const yieldVisitor = {
    Function(path) {
      path.skip();
    },
    YieldExpression(path) {
      if (!hasBeenReplaced(path.parent, this.sentId)) {
        path.replaceWith(types.assignmentExpression("=", types.identifier(this.sentId), path.node));
      }
    },
    MetaProperty(path) {
      if (isFunctionSent(path.node)) {
        path.replaceWith(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(types.variableDeclaration("let", [types.variableDeclarator(types.identifier(sentId), types.yieldExpression())]));
        wrapFunction(fnPath, state.addHelper("skipFirstGeneratorNext"));
      }
    }
  };
});

export { index as default };
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