TypeScript找不到名称forEach

Question

我正在尝试在我的TypeScipt程序中使用forEach，如下所示：

const treeForEachDF: <T>(f: Command<T>, tree: Tree<T>)=>void =
(f, tree) => {
    f(tree.root);
    if (!treeLeaf(tree))
        forEach(x => treeForEachDF(f, x), treeChildren(tree));
};

但是，我收到以下错误：

“TS2304找不到名称'forEach'”

我的tsconfig.json：

{
   "compilerOptions": {
   "module": "commonjs",
   "target": "es5",
   "noImplicitAny": false,
   "sourceMap": false,
     "types": [
        "node"
     ],
     "typeRoots": [
        "node_modules/@types"
     ]
},
    "exclude": [
    "lib/startup.ts",
    "node_modules/",
    "typings/"
    ]
}

Answer 1

显然有一种方法可以使用forEach，因为我首先尝试从'ramda'导入它，如下所示：

import {map, reduce, forEach} from 'ramda'