错误：未知命名模块：“./constants”答案

【问题标题】：Error: Unknown named module: "./constants"错误：未知命名模块：“./constants”
【发布时间】：2021-10-08 19:27:22
【问题描述】：

我在尝试将 API（特别是 what3words API）导入我的 react 本机应用时遇到问题。问题是每次我尝试导入模块时，都会收到错误“未知命名模块”

我已设法查明问题所在。当我进入 node_modules 文件夹，然后进入 what3words/api 文件夹并注释掉所有“需要”时，错误消失了，但是我无法使用 api。

(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports", "./constants", "./requests/autosuggest", "./requests/autosuggest-selection", "./requests/available-languages", "./requests/convert-to-3wa", "./requests/convert-to-coordinates", "./requests/grid-section", "./utils"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.valid3wa = exports.getWords = exports.getOptions = exports.setOptions = exports.gridSectionGeoJson = exports.gridSection = exports.convertToCoordinatesGeoJson = exports.convertToCoordinates = exports.convertTo3waGeoJson = exports.convertTo3wa = exports.availableLanguages = exports.autosuggestSelection = exports.autosuggest = exports.W3W_REGEX = void 0;
    var constants_1 = require("./constants");
    Object.defineProperty(exports, "W3W_REGEX", { enumerable: true, get: function () { return constants_1.W3W_REGEX; } });
    // var autosuggest_1 = require("./requests/autosuggest");
    Object.defineProperty(exports, "autosuggest", { enumerable: true, get: function () { return autosuggest_1.autosuggest; } });
    // var autosuggest_selection_1 = require("./requests/autosuggest-selection");
    Object.defineProperty(exports, "autosuggestSelection", { enumerable: true, get: function () { return autosuggest_selection_1.autosuggestSelection; } });
    // var available_languages_1 = require("./requests/available-languages");
    Object.defineProperty(exports, "availableLanguages", { enumerable: true, get: function () { return available_languages_1.availableLanguages; } });
    // var convert_to_3wa_1 = require("./requests/convert-to-3wa");
    Object.defineProperty(exports, "convertTo3wa", { enumerable: true, get: function () { return convert_to_3wa_1.convertTo3wa; } });
    Object.defineProperty(exports, "convertTo3waGeoJson", { enumerable: true, get: function () { return convert_to_3wa_1.convertTo3waGeoJson; } });
    // var convert_to_coordinates_1 = require("./requests/convert-to-coordinates");
    Object.defineProperty(exports, "convertToCoordinates", { enumerable: true, get: function () { return convert_to_coordinates_1.convertToCoordinates; } });
    Object.defineProperty(exports, "convertToCoordinatesGeoJson", { enumerable: true, get: function () { return convert_to_coordinates_1.convertToCoordinatesGeoJson; } });
    // var grid_section_1 = require("./requests/grid-section");
    Object.defineProperty(exports, "gridSection", { enumerable: true, get: function () { return grid_section_1.gridSection; } });
    Object.defineProperty(exports, "gridSectionGeoJson", { enumerable: true, get: function () { return grid_section_1.gridSectionGeoJson; } });
    // var utils_1 = require("../es2015/utils.js");
    Object.defineProperty(exports, "setOptions", { enumerable: true, get: function () { return utils_1.setOptions; } });
    Object.defineProperty(exports, "getOptions", { enumerable: true, get: function () { return utils_1.getOptions; } });
    Object.defineProperty(exports, "getWords", { enumerable: true, get: function () { return utils_1.getWords; } });
    Object.defineProperty(exports, "valid3wa", { enumerable: true, get: function () { return utils_1.valid3wa; } });
});

网上搜索后发现这个问题与metro和require函数有关。请帮忙，谢谢

【问题讨论】：

标签： react-native babeljs require metro-bundler

【解决方案1】：

设法修复它！在 what3words api 的一位贡献者的帮助下。这似乎是 Metro 无法捆绑 umd 模块的问题。幸运的是，what3words api 有我们可以使用的 es2015 模块，所以我只是使用了

const api = require('@what3words/api/es2015');

而不是以前的

const api = require('@what3words/api');

检查https://github.com/what3words/w3w-node-wrapper/issues/28 以获得完整调试

【讨论】：