如何修复 Deno 程序中 std 模块依赖的编译器错误？

Question

我知道有一个问题有同样的错误，但那里的答案对我没有帮助：deno 捆绑失败。类型“ReadableStream<R>”上不存在属性“getIterator”

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这是完整的错误：

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\xe2\x9d\xaf deno run --allow-all server.ts\n检查文件:///Users/hagenek/repos/mock-backend/server.ts\n错误：TS2339 [错误]：属性\'getIterator\'类型 \'ReadableStream\' 上不存在。\nreturn res.read.getIterator();\n~~~~~~~~~~~~\nat https://deno.land/std@0.83.0/异步/pool.ts:45:23

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这是我的 server.ts 代码：

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import { Application } from "./deps.ts";\nimport router from "./routes.ts"\nconst PORT = 4000;\nconst app = new Application();\n\napp.use(router.routes()); // Pass our router as a middleware\napp.use(router.allowedMethods()); // Allow HTTP methods on router\n\nawait app.listen({ port: PORT });\nconsole.log(`Server running on PORT: ${PORT}`)\n

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路线.ts：

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import { Router } from "https://deno.land/x/oak/mod.ts";\nimport {\n    addQuote,\n    getQuotes,\n    getQuote,\n    updateQuote,\n    deleteQuote,\n} from "./controllers/controller.ts";\n\ninterface ReadableStream<R> {\n    getIterator(): any\n}\n\nconst router = new Router(); // Create Router\n\n    router\n        .get("/api/quote", getQuotes) // Get all quotes\n        .get("/api/quote/:id", getQuote) // Get one quote of quoteID: id\n        .post("/api/quote", addQuote) // Add a quote\n        .put("/api/quote/:id", updateQuote) // Update a quote\n        .delete("/api/quote/:id", deleteQuote); // Delete a quote\n    \n    export default router;\n

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部门ts

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export {\n    Application\n} from "https://deno.land/x/oak/mod.ts"\n

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控制器.ts

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interface Quote {\n    _id: { $oid: string };\n    quote: string;\n    quoteID: string;\n    author: string;\n}\n\nimport {MongoClient} from "https://deno.land/x/mongo@v0.22.0/mod.ts";\n\nconst URI = "mongodb://127.0.0.1:27017";\n\n// Mongo Connection Init\nconst client = new MongoClient();\ntry {\n    await client.connect(URI);\n    console.log("Database successfully connected");\n} catch (err) {\n    console.log(err);\n}\n\nconst db = client.database("quotesApp");\nconst quotes = db.collection<Quote>("quotes");\n\n// DESC: ADD single quote\n// METHOD: POST /api/quote\nexport const addQuote = async ({request, response,}: {\n    request: any;\n    response: any;\n}) => {\n    try {\n        // If the request has no Body, it will return a 404\n        if (!request.hasBody) {\n            response.status = 400;\n            response.body = {\n                success: false,\n                msg: "No Data",\n            };\n        } else {\n            // Otherwise, it will try to insert\n            // a quote in the DB and respond with 201\n            const body = await request.body();\n            const quote = await body.value;\n            await quotes.insertOne(quote);\n            response.status = 201;\n            response.body = {\n                success: true,\n                data: quote,\n            };\n        }\n    } catch (err) {\n        response.body = {\n            success: false,\n            msg: err.toString(),\n        };\n    }\n};\n\n// DESC: GET single quote\n// METHOD: GET /api/quote/:id\nexport const getQuote = async ({\n                            params,\n                            response,\n                        }: {\n    params: { id: string };\n    response: any;\n}) => {\n    // Searches for a particular quote in the DB\n    const quote = await quotes.findOne({quoteID: params.id});\n    // If found, respond with the quote. If not, respond with a 404\n    if (quote) {\n        response.status = 200;\n        response.body = {\n            success: true,\n            data: quote,\n        };\n    } else {\n        response.status = 404;\n        response.body = {\n            success: false,\n            msg: "No quote found",\n        };\n    }\n};\n\n// DESC: GET all Quotes\n// METHOD GET /api/quote\nexport const getQuotes = async ({response}: { response: any }) => {\n    try {\n        // Find all quotes and convert them into an Array\n        const allQuotes = await quotes.find({}).toArray();\n        console.log(allQuotes);\n        if (allQuotes) {\n            response.status = 200;\n            response.body = {\n                success: true,\n                data: allQuotes,\n            };\n        } else {\n            response.status = 500;\n            response.body = {\n                success: false,\n                msg: "Internal Server Error",\n            };\n        }\n    } catch (err) {\n        response.body = {\n            success: false,\n            msg: err.toString(),\n        };\n    }\n};\n\n// DESC: UPDATE single quote\n// METHOD: PUT /api/quote/:id\nexport const updateQuote = async ({\n                               params,\n                               request,\n                               response,\n                           }: {\n    params: { id: string };\n    request: any;\n    response: any;\n}) => {\n    try {\n        // Search a quote in the DB and update with given values if found\n        const body = await request.body();\n        const inputQuote = await body.value;\n        await quotes.updateOne(\n            { quoteID: params.id },\n            { $set: { quote: inputQuote.quote, author: inputQuote.author } }\n        );\n        // Respond with the Updated Quote\n        const updatedQuote = await quotes.findOne({ quoteID: params.id });\n        response.status = 200;\n        response.body = {\n            success: true,\n            data: updatedQuote,\n        };\n    } catch (err) {\n        response.body = {\n            success: false,\n            msg: err.toString(),\n        };\n    }\n};\n\n\n// DESC: DELETE single quote\n// METHOD: DELETE /api/quote/:id\nexport const deleteQuote = async ({\n                               params,\n                               response,\n                           }: {\n    params: { id: string };\n    request: any;\n    response: any;\n}) => {\n    try {\n        // Search for the given quote and drop it from the DB\n        await quotes.deleteOne({quoteID: params.id});\n        response.status = 201;\n        response.body = {\n            success: true,\n            msg: "Product deleted",\n        };\n    } catch (err) {\n        response.body = {\n            success: false,\n            msg: err.toString(),\n        };\n    }\n};\n

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Answer 1

问题

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您正在使用过时版本的deno.land/x/mongo(v0.22.0，其依赖项也已过时并且与 Deno\ 当前的内置类型库不一致)。

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解决方案

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使用与您正在使用的 Deno 版本兼容的模块版本。

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在撰写本答案时，Deno 稳定版本为 v 1.16.3，该模块的最新版本为 v 0.28.0：https://deno.land/x/mongo@v0.28.0。他们看起来很兼容。

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解释

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这是模块中的编译器错误：

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% deno cache server.ts \nCheck file:///Users/deno/so-70169022/server.ts\nerror: TS2339 [ERROR]: Property \'getIterator\' does not exist on type \'ReadableStream<R>\'.\n  return res.readable.getIterator();\n                      ~~~~~~~~~~~\n    at https://deno.land/std@0.83.0/async/pool.ts:45:23\n

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作为参考，这是我正在使用的 Deno 版本：

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% deno --version\ndeno 1.16.3 (release, x86_64-apple-darwin)\nv8 9.7.106.5\ntypescript 4.4.2\n

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您可以看到错误发生在模块中https://deno.land/std@0.83.0/async/pool.ts（不幸的是，您无法编辑以修复问题）。请注意，它是来自std库中的模块（我将回到这一点）。

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这是入口点的模块图：

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注意：为了提高可读性，我删除了输出中与有问题的模块无关的所有行

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% deno info server.ts\nlocal: /Users/deno/so-70169022/server.ts\ntype: TypeScript\ndependencies: 134 unique (total 1.72MB)\n\nfile:///Users/deno/so-70169022/server.ts (334B)\n\xe2\x94\x94\xe2\x94\x80\xe2\x94\xac file:///Users/deno/so-70169022/routes.ts (638B)\n  \xe2\x94\x94\xe2\x94\x80\xe2\x94\xac file:///Users/deno/so-70169022/controllers/controller.ts (4.24KB)\n    \xe2\x94\x94\xe2\x94\x80\xe2\x94\xac https://deno.land/x/mongo@v0.22.0/mod.ts (113B)\n      \xe2\x94\x94\xe2\x94\x80\xe2\x94\xac https://deno.land/x/mongo@v0.22.0/deps.ts (783B)\n        \xe2\x94\x94\xe2\x94\x80\xe2\x94\xac https://deno.land/std@0.83.0/node/_crypto/pbkdf2.ts (4.18KB)\n          \xe2\x94\x94\xe2\x94\x80\xe2\x94\xac https://deno.land/std@0.83.0/node/buffer.ts (15.46KB)\n            \xe2\x94\x94\xe2\x94\x80\xe2\x94\xac https://deno.land/std@0.83.0/node/_utils.ts (5.74KB)\n              \xe2\x94\x94\xe2\x94\x80\xe2\x94\xac https://deno.land/std@0.83.0/async/mod.ts (202B)\n                \xe2\x94\x94\xe2\x94\x80\xe2\x94\x80 https://deno.land/std@0.83.0/async/pool.ts (1.58KB)\n

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有问题的模块位于库中一系列嵌套导入的底部std，这些导入导致mongo/deps.ts和mongo/mod.ts，它由./controllers/controller.ts（这是您可以直接编辑以解决问题的第一个模块）。

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现在我要暂停一下再回顾一下std模块：

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在https://deno.land/std@0.116.0#releases它说：

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标准库目前的标记与 Deno 版本无关。一旦库稳定下来，这种情况就会改变。

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要检查不同版本的标准库与 Deno CLI 的兼容性，请参阅此列表。

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这意味着每个版本std库的每个版本仅保证与特定版本的 Deno 兼容。

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std程序中 mongo 模块当前使用的库版本是 v 0.83.0，参考上面链接的兼容性 JSON 列表，您可以发现它映射到 Deno v1.6.3（相当旧）。

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此时，您最容易访问的选项是：

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1. 使用与该版本的 mongo 模块兼容的 Deno 版本（使用旧版本的 Deno 可能不是最好的主意），或者

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2. 使用与较新版本的 Deno 兼容的 mongo 模块版本（让我们先尝试一下这个）

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让我们看看 mongo 模块的最新版本是什么：

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https://deno.land/x/mongo@v0.28.0/deps.ts是目前最新版本，它使用了0.111.0vstd库的 v 。

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让我们尝试更新程序中 mongo 模块的版本，看看是否修复了编译器错误：

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./controllers/controller.ts（第 8 行）：

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% deno cache server.ts \nCheck file:///Users/deno/so-70169022/server.ts\nerror: TS2339 [ERROR]: Property \'getIterator\' does not exist on type \'ReadableStream<R>\'.\n  return res.readable.getIterator();\n                      ~~~~~~~~~~~\n    at https://deno.land/std@0.83.0/async/pool.ts:45:23\n

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现在让我们再次输入检查并缓存您的入口点：

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% deno cache server.ts\n\n

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这次没有编译错误！

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