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

Compile function bind operator to ES5

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

const index = declare(api => {
  api.assertVersion("^7.0.0-0 || ^8.0.0");
  function getTempId(scope) {
    let id = scope.path.getData("functionBind");
    if (id) return types.cloneNode(id);
    id = scope.generateDeclaredUidIdentifier("context");
    return scope.path.setData("functionBind", id);
  }
  function getObject(bind) {
    if (types.isExpression(bind.object)) {
      return bind.object;
    }
    return bind.callee.object;
  }
  function getStaticContext(bind, scope) {
    const object = getObject(bind);
    return scope.isStatic(object) && (types.isSuper(object) ? types.thisExpression() : object);
  }
  function inferBindContext(bind, scope) {
    const staticContext = getStaticContext(bind, scope);
    if (staticContext) return types.cloneNode(staticContext);
    const tempId = getTempId(scope);
    if (bind.object) {
      bind.callee = types.sequenceExpression([types.assignmentExpression("=", tempId, bind.object), bind.callee]);
    } else if (types.isMemberExpression(bind.callee)) {
      bind.callee.object = types.assignmentExpression("=", tempId, bind.callee.object);
    }
    return types.cloneNode(tempId);
  }
  return {
    name: "proposal-function-bind",
    manipulateOptions: (_, parser) => parser.plugins.push("functionBind"),
    visitor: {
      CallExpression({
        node,
        scope
      }) {
        const bind = node.callee;
        if (!types.isBindExpression(bind)) return;
        const context = inferBindContext(bind, scope);
        node.callee = types.memberExpression(bind.callee, types.identifier("call"));
        node.arguments.unshift(context);
      },
      BindExpression(path) {
        const {
          node,
          scope
        } = path;
        const context = inferBindContext(node, scope);
        path.replaceWith(types.callExpression(types.memberExpression(node.callee, types.identifier("bind")), [context]));
      }
    }
  };
});

export { index as default };
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