Gre*_*een 15 typescript spread-syntax
TS 抛出奇怪的错误:
错误:(125, 18) TS2569:类型“字符串”不是数组类型或字符串类型。使用编译器选项“--downlevelIteration”来允许迭代器迭代。
为什么字符串不是字符串?
我想看看 TS 将如何为字符串编译扩展运算符。
我在浏览器控制台中的代码。一个字符串被分解成字符:
> s = 'abcdef';
> r = [...s];
< (6) ["a", "b", "c", "d", "e", "f"]
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我在 TS 中的代码:
const s: string = 'abcdef';
const res = [...s]; // <= Error: Type 'string' is not an array type or a string type
console.log(res);
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为什么?
TS版本:
"dependencies": {
"typescript": "^3.5.3"
}
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更新:
更新:
我的 tsconfig.json
{
"compilerOptions": {
"target": "es5",
"lib": [
"dom",
"dom.iterable",
"esnext"
],
"downlevelIteration": false,
"allowJs": true,
"skipLibCheck": false,
"esModuleInterop": true,
"allowSyntheticDefaultImports": true,
"alwaysStrict": true,
"strict": true,
"forceConsistentCasingInFileNames": true,
"module": "esnext",
"moduleResolution": "node",
"resolveJsonModule": true,
"isolatedModules": false,
"noEmit": false,
"sourceMap": true,
"baseUrl": "./",
"jsx": "preserve"
},
"compileOnSave": true,
"files": [
"sample.ts"
],
"exclude": [
"node_modules",
"**/*.spec.ts"
]
}
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小智 17
扩展异端猴子的评论:
将目标从 更改es5为es2015或es6修复问题。tsconfig.json为了清楚起见,这是我的全文:
{
"compilerOptions": {
"target": "es2015",
"lib": [
"dom",
"dom.iterable",
"esnext"
],
"allowJs": true,
"skipLibCheck": true,
"strict": true,
"forceConsistentCasingInFileNames": true,
"noEmit": true,
"esModuleInterop": true,
"module": "esnext",
"moduleResolution": "node",
"resolveJsonModule": true,
"isolatedModules": true,
"jsx": "preserve",
},
"exclude": [
"node_modules"
],
"include": [
"next-env.d.ts",
"**/*.ts",
"**/*.tsx"
]
}
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旁注:"downlevelIteration": true也修复了它,但这对我来说似乎不是正确的解决方案。
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