@popperjs/core 依赖。npm install @popperjs/core ,那么,打包时,就会出现下面报错。
Named export ‘placements’ not found. The requested module ‘@popperjs/core’ is a CommonJS module, which may not support all module.exports as named exports. CommonJS modules can always be imported via the default export, for example using: import pkg from ‘@popperjs/core’; const { placements, createPopper } = pkg;
"@popperjs/core": "npm:@sxzz/popperjs-es@^2.11.7" (esm 的包)重新 npm install,即可。