typescript 打字稿 csv-parse
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Typescript csv-parse
提问by niklas
I am trying to parse a csv file with typescript which I am totally new to. I cannot get the parser working with the correct typings.
我正在尝试使用我完全陌生的打字稿解析 csv 文件。我无法让解析器使用正确的类型。
Without typings everything is easy:
没有打字一切都很容易：
var fs = require('fs');
var parse = require('csv-parse');
var parser = parse({delimiter: ';'}, function(err, data){
console.log(data);
});
fs.createReadStream(__dirname+'/fs_read.csv').pipe(parser);
But when it comes to typescript I get errors, I installed the typings from dt:
但是当涉及到打字稿时，我遇到了错误，我从 dt安装了打字稿：
import * as csvParse from 'csv-parse';
import fs = require('fs');
var myParser:csvParse.CsvParser = csvParse({delimiter: ','}, function(data, err) {
console.log(data);
});
I get the error
我收到错误
Type 'void | CsvParser' is not assignable to type 'CsvParser'.
Can anyone give me a hint or used csv-parse with typescript before and share their code?
任何人都可以给我一个提示或在打字稿之前使用 csv-parse 并分享他们的代码吗？
回答by Ross Scott
This is just a simple casting issue, all your code is right, its just TS needs help knowing what is being returned from CsvParse. If you take a look at the definition file, its return signature is void|parse.CsvParser.
So to tell TS that it is actually a CsvParser (and not void) just cast it:
这只是一个简单的转换问题，您的所有代码都是正确的，只是 TS 需要帮助了解从 CsvParse 返回的内容。如果你看一下定义文件，它的返回签名是void|parse.CsvParser. 因此，要告诉 TS 它实际上是一个 CsvParser（而不是 void），只需将其强制转换即可：
var myParser:csvParse.CsvParser = csvParse({delimiter: ','}, function(data, err) {
console.log(data);
}) as csvParse.CsvParser;
回答by jajones
I was running into a different problem and had to change the index.d.ts in @types/csv-parse from:
我遇到了一个不同的问题，不得不将 @types/csv-parse 中的 index.d.ts 更改为：
export = parse;
to:
到：
export default parse;
This allowed me to access the parse function and pass it to the fs stream properly.
这使我能够访问 parse 函数并将其正确传递给 fs 流。
