transform-error-messages.js — react Source File

Source Code

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
'use strict';

const fs = require('fs');
const {evalStringAndTemplateConcat} = require('../shared/evalToString');
const invertObject = require('./invertObject');
const helperModuleImports = require('@babel/helper-module-imports');

const errorMap = invertObject(
  JSON.parse(fs.readFileSync(__dirname + '/codes.json', 'utf-8'))
);

const SEEN_SYMBOL = Symbol('transform-error-messages.seen');

module.exports = function (babel) {
  const t = babel.types;

  function ErrorCallExpression(path, file) {
    // Turns this code:
    //
    // new Error(`A ${adj} message that contains ${noun}`);
    //
    // or this code (no constructor):
    //
    // Error(`A ${adj} message that contains ${noun}`);
    //
    // into this:
    //
    // Error(formatProdErrorMessage(ERR_CODE, adj, noun));
    const node = path.node;
    if (node[SEEN_SYMBOL]) {
      return;
    }
    node[SEEN_SYMBOL] = true;

    const errorMsgNode = node.arguments[0];
    if (errorMsgNode === undefined) {
      return;
    }

    const errorMsgExpressions = [];
    const errorMsgLiteral = evalStringAndTemplateConcat(
      errorMsgNode,
      errorMsgExpressions
    );

    if (errorMsgLiteral === 'react-stack-top-frame') {
      // This is a special case for generating stack traces.
      return;
    }

    let prodErrorId = errorMap[errorMsgLiteral];
    if (prodErrorId === undefined) {
      // There is no error code for this message. Add an inline comment
      // that flags this as an unminified error. This allows the build
// ... (95 more lines)