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neverthrow practice
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| { | |
| "tasks": { | |
| "dev": "deno run --watch main.ts" | |
| }, | |
| "imports": { | |
| "@std/assert": "jsr:@std/assert@1", | |
| "neverthrow": "npm:neverthrow@^8.2.0", | |
| "valibot": "npm:valibot@^1.1.0" | |
| } | |
| } |
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| { | |
| "version": "5", | |
| "specifiers": { | |
| "jsr:@std/assert@1": "1.0.14", | |
| "jsr:@std/internal@^1.0.10": "1.0.10", | |
| "npm:neverthrow@^8.2.0": "8.2.0", | |
| "npm:valibot@^1.1.0": "1.1.0" | |
| }, | |
| "jsr": { | |
| "@std/[email protected]": { | |
| "integrity": "68d0d4a43b365abc927f45a9b85c639ea18a9fab96ad92281e493e4ed84abaa4", | |
| "dependencies": [ | |
| "jsr:@std/internal" | |
| ] | |
| }, | |
| "@std/[email protected]": { | |
| "integrity": "e3be62ce42cab0e177c27698e5d9800122f67b766a0bea6ca4867886cbde8cf7" | |
| } | |
| }, | |
| "npm": { | |
| "@rollup/[email protected]": { | |
| "integrity": "sha512-GUdZKTeKBq9WmEBzvFYuC88yk26vT66lQV8D5+9TgkfbewhLaTHRNATyzpQwwbHIfJvDJ3N9WJ90wK/uR3cy3Q==", | |
| "os": ["linux"], | |
| "cpu": ["x64"] | |
| }, | |
| "[email protected]": { | |
| "integrity": "sha512-kOCT/1MCPAxY5iUV3wytNFUMUolzuwd/VF/1KCx7kf6CutrOsTie+84zTGTpgQycjvfLdBBdvBvFLqFD2c0wkQ==", | |
| "optionalDependencies": [ | |
| "@rollup/rollup-linux-x64-gnu" | |
| ] | |
| }, | |
| "[email protected]": { | |
| "integrity": "sha512-Nk8lX30Qhu+9txPYTwM0cFlWLdPFsFr6LblzqIySfbZph9+BFsAHsNvHOymEviUepeIW6KFHzpX8TKhbptBXXw==" | |
| } | |
| }, | |
| "workspace": { | |
| "dependencies": [ | |
| "jsr:@std/assert@1", | |
| "npm:neverthrow@^8.2.0", | |
| "npm:valibot@^1.1.0" | |
| ] | |
| } | |
| } |
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| import { err, errAsync, ok, type Result, ResultAsync } from "neverthrow"; | |
| import * as v from "valibot"; | |
| import { type QuakeHistory, quakeHistorySchema } from "./example_1_schema.ts"; | |
| /** @see {@link https://www.p2pquake.net/develop/json_api_v2/ P2P地震情報} */ | |
| const baseUrl = "https://api.p2pquake.net/v2/history"; | |
| interface ErrorBase { | |
| readonly errorName: string; | |
| readonly summary: string; | |
| readonly details?: string; | |
| } | |
| interface NetworkError extends ErrorBase { | |
| readonly errorName: "NetworkError"; | |
| readonly inner: unknown; | |
| } | |
| interface JsonParseError extends ErrorBase { | |
| readonly errorName: "JsonParseError"; | |
| readonly inner: unknown; | |
| } | |
| interface HttpClientError extends ErrorBase { | |
| readonly errorName: "HttpClientError"; | |
| readonly inner: Response; | |
| } | |
| interface HttpServerError extends ErrorBase { | |
| readonly errorName: "HttpServerError"; | |
| readonly inner: Response; | |
| } | |
| interface HttpUnknownError extends ErrorBase { | |
| readonly errorName: "HttpUnknownError"; | |
| readonly inner: Response; | |
| } | |
| type HttpError = HttpClientError | HttpServerError | HttpUnknownError; | |
| interface ValidationError extends ErrorBase { | |
| readonly errorName: "ValidationError"; | |
| // readonly inner: v.ValiError<typeof quakeHistorySchema>; | |
| readonly inner: v.ValiError<typeof quakeHistorySchema>["issues"]; | |
| } | |
| type FetchQuakeHistoryError = | |
| | NetworkError | |
| | JsonParseError | |
| | HttpError | |
| | ValidationError; | |
| function fetchQuakeData(): ResultAsync<QuakeHistory, FetchQuakeHistoryError> { | |
| const url = new URL(baseUrl); | |
| url.searchParams.append("limit", String(1)); | |
| url.searchParams.append("offset", String(0)); | |
| console.debug(url); | |
| const result = ResultAsync.fromPromise( | |
| fetch(baseUrl.toString(), { | |
| method: "GET", | |
| headers: { | |
| "Content-Type": "application/json", | |
| "accept": "application/json", | |
| }, | |
| }), | |
| (error): NetworkError => ({ | |
| errorName: "NetworkError", | |
| summary: `NetworkError: ${ | |
| error instanceof Error ? error.message : String(error) | |
| }`, | |
| inner: error, | |
| }), | |
| ) | |
| .andThen((response): ResultAsync<unknown, JsonParseError | HttpError> => { | |
| if (response.ok) { | |
| return ResultAsync.fromPromise( | |
| response.json(), | |
| (e): JsonParseError => ({ | |
| errorName: "JsonParseError", | |
| summary: "JsonParseError", | |
| inner: e, | |
| }), | |
| ); | |
| } else { | |
| const { status } = response; | |
| if (status >= 400 && status < 500) { | |
| return errAsync({ | |
| errorName: "HttpClientError", | |
| summary: "HttpClientError", | |
| inner: response, | |
| }); | |
| } else if (status >= 500) { | |
| return errAsync({ | |
| errorName: "HttpServerError", | |
| summary: "HttpServerError", | |
| inner: response, | |
| }); | |
| } else { | |
| const error: HttpUnknownError = { | |
| errorName: "HttpUnknownError", | |
| summary: "HttpUnknownError", | |
| inner: response, | |
| }; | |
| return errAsync(error); | |
| } | |
| } | |
| }) | |
| .andThen((data): Result<QuakeHistory, ValidationError> => { | |
| const parseResult = v.safeParse(quakeHistorySchema, data); | |
| if (!parseResult.success) { | |
| const error: ValidationError = { | |
| errorName: "ValidationError", | |
| summary: "ValidationError", | |
| inner: parseResult.issues, | |
| }; | |
| return err(error); | |
| } | |
| const validatedData: QuakeHistory = parseResult.output; | |
| return ok(validatedData); | |
| }); | |
| return result; | |
| } | |
| async function main() { | |
| await fetchQuakeData().match( | |
| (value) => { | |
| console.log(JSON.stringify(value, null, 2)); | |
| }, | |
| (error) => { | |
| switch (error.errorName) { | |
| // case "NetworkError": | |
| // case "JsonParseError": | |
| // case "HttpClientError": | |
| // case "HttpServerError": | |
| // case "HttpUnknownError": | |
| // case "ValidationError": | |
| default: { | |
| console.error(error); | |
| } | |
| } | |
| }, | |
| ); | |
| } | |
| if (import.meta.main) { | |
| await main(); | |
| } |
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| import * as v from "valibot"; | |
| const nonNegaIntSchema = v.pipe( | |
| v.number(), | |
| v.integer(), | |
| v.minValue(0), | |
| ); | |
| const areaPeersSchema = v.looseObject({ | |
| areas: v.array( | |
| v.looseObject({ | |
| id: nonNegaIntSchema, | |
| peer: nonNegaIntSchema, | |
| }), | |
| ), | |
| code: nonNegaIntSchema, | |
| created_at: v.string(), | |
| hop: nonNegaIntSchema, | |
| id: v.string(), | |
| time: v.string(), | |
| uid: v.string(), | |
| ver: v.string(), | |
| detection: v.optional(v.string()), | |
| }); | |
| const eewDetectionSchema = v.looseObject({ | |
| id: v.string(), | |
| code: v.literal(554), | |
| time: v.string(), | |
| type: v.string(), | |
| detection: v.optional(v.string()), | |
| }); | |
| const otherSchema = v.looseObject({}); | |
| /** @see {@link https://www.p2pquake.net/develop/json_api_v2/ P2P地震情報} */ | |
| export const quakeHistorySchema = v.array( | |
| v.union([ | |
| areaPeersSchema, | |
| eewDetectionSchema, | |
| otherSchema, | |
| ]) | |
| ) | |
| export type QuakeHistory = v.InferOutput<typeof quakeHistorySchema>; |
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| export function add(a: number, b: number): number { | |
| return a + b; | |
| } | |
| // Learn more at https://docs.deno.com/runtime/manual/examples/module_metadata#concepts | |
| if (import.meta.main) { | |
| console.log("Add 2 + 3 =", add(2, 3)); | |
| } |
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| import { assertEquals } from "@std/assert"; | |
| import { add } from "./main.ts"; | |
| Deno.test(function addTest() { | |
| assertEquals(add(2, 3), 5); | |
| }); |
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