node.js - 类型错误 : Cannot read property 'onReady' of undefined

Question

当我运行 node ./myapp.js 时，我得到了

(node:14122) ExperimentalWarning: The ESM module loader is experimental.
internal/modules/cjs/loader.js:637
      module.reflect.onReady((reflect) => {
                     ^

TypeError: Cannot read property 'onReady' of undefined
    at Module.load (internal/modules/cjs/loader.js:637:22)
    at tryModuleLoad (internal/modules/cjs/loader.js:566:12)
    at Function.Module._load (internal/modules/cjs/loader.js:558:3)
    at Module.require (internal/modules/cjs/loader.js:663:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/home/ecarroll/code/sw/source-water/sw-input/node_modules/psl/index.js:14:19)
    at Module._compile (internal/modules/cjs/loader.js:734:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:745:10)
    at Module.load (internal/modules/cjs/loader.js:626:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:566:12)

Answer 1

这里的关键是，

(node:14122) ExperimentalWarning: The ESM module loader is experimental.

此错误和后续类型错误

TypeError: Cannot read property 'onReady' of undefined

是由存在引起的，

NODE_OPTIONS=--experimental-modules

您应该取消定义或设置它NODE_MODULES=""Node ...

If you run Node with --experimental-modules then,

It's important to note here that .mjs isn't only about file extensions. running node with the --experimental-modules flag also means that ES6 module specifiers must be valid urls, so the extension has to be included in the import statement, e.g. import x from './x.mjs