Sweep: Fix the typing error when run tests with jest.

[colkito]

Details

Analize and fix the following error I have when run the yarn test command in the terminal. The error looks to be related to types in the test file src/index.test.ts.

Error:

➜  bitpay-rates git:(main) yarn test               
yarn run v1.22.22
$ jest
 FAIL  src/index.test.ts
  ● Test suite failed to run

    src/index.test.ts:12:12 - error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'RateResponse'.
      Property '0' does not exist on type 'RateResponse'.

    12     expect(data[0]).toHaveProperty('code');
                  ~~~~~~~
    src/index.test.ts:13:12 - error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'RateResponse'.
      Property '0' does not exist on type 'RateResponse'.

    13     expect(data[0]).toHaveProperty('name');
                  ~~~~~~~
    src/index.test.ts:14:12 - error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'RateResponse'.
      Property '0' does not exist on type 'RateResponse'.

    14     expect(data[0]).toHaveProperty('rate');
                  ~~~~~~~

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        0.621 s
Ran all test suites.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Branch

main

[sweep-ai]

🚀 Here's the PR! #262

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Step 1: 🔎 Searching

Here are the code search results. I'm now analyzing these search results to write the PR.

Relevant files (click to expand). Mentioned files will always appear here.

bitpay-rates/src/index.ts

Lines 1 to 63 in 03870c3

	/**
	* Import the `RequestOptions` type from the `https` module.
	* Using `import type` ensures better runtime safety.
	*/
	import https, { type RequestOptions } from 'https';
	/**
	* Represents an exchange rate for a currency.
	* @property {string} code - The currency code (e.g. "USD").
	* @property {string} name - The full name of the currency.
	* @property {number} rate - The exchange rate for the currency.
	*/
	export type RateObj = {
	code: string;
	name: string;
	rate: number;
	};
	/**
	* The response from the exchange rates API.
	* Can be a single exchange rate or an array of exchange rates.
	*/
	export type RateResponse = RateObj | [RateObj];
	const defaultOptions: RequestOptions = {
	host: 'bitpay.com',
	path: '/rates',
	headers: {},
	agent: false,
	};
	const returnPromise = (options: RequestOptions): Promise<RateResponse> => {
	return new Promise((resolve, reject) => {
	https
	.get(options, (res) => {
	let dataBuffer = '';
	res.on('data', (chunk: Buffer) => {
	dataBuffer += chunk.toString('utf8');
	});
	res.on('end', () => {
	try {
	const { data } = JSON.parse(dataBuffer);
	return resolve(data);
	} catch (err) {
	return reject(err as Error);
	}
	});
	})
	.on('error', (err) => {
	return reject(err as Error);
	});
	});
	};
	export const get = (code?: string): Promise<RateResponse> => {
	if (typeof code === 'string') {
	defaultOptions.path += `/${code.toUpperCase()}`;
	}
	return returnPromise(defaultOptions);
	};

bitpay-rates/tsconfig.json

Lines 1 to 72 in 03870c3

	{
	"compilerOptions": {
	/* Visit https://aka.ms/tsconfig.json to read more about this file */
	/* Basic Options */
	// "incremental": true, /* Enable incremental compilation */
	"target": "es2018" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ccccc', or 'ESNEXT'. */,
	"module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'cccccc'. */,
	"lib": ["es2018"], /* Specify library files to be included in the compilation. */
	// "allowJs": true, /* Allow javascript files to be compiled. */
	// "checkJs": true, /* Report errors in .js files. */
	// "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */
	"declaration": true /* Generates corresponding '.d.ts' file. */,
	// "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */
	// "sourceMap": true, /* Generates corresponding '.map' file. */
	// "outFile": "./", /* Concatenate and emit output to single file. */
	"outDir": "./dist" /* Redirect output structure to the directory. */,
	// "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
	// "composite": true, /* Enable project compilation */
	// "tsBuildInfoFile": "./", /* Specify file to store incremental compilation information */
	// "removeComments": true, /* Do not emit comments to output. */
	// "noEmit": true, /* Do not emit outputs. */
	// "importHelpers": true, /* Import emit helpers from 'tslib'. */
	// "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
	// "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
	/* Strict Type-Checking Options */
	"strict": true /* Enable all strict type-checking options. */,
	// "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
	// "strictNullChecks": true, /* Enable strict null checks. */
	// "strictFunctionTypes": true, /* Enable strict checking of function types. */
	// "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
	// "strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */
	// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
	// "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
	/* Additional Checks */
	// "noUnusedLocals": true, /* Report errors on unused locals. */
	// "noUnusedParameters": true, /* Report errors on unused parameters. */
	// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
	// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
	// "noUncheckedIndexedAccess": true, /* Include 'undefined' in index signature results */
	// "noPropertyAccessFromIndexSignature": true, /* Require undeclared properties from index signatures to use element accesses. */
	/* Module Resolution Options */
	// "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
	// "baseUrl": "./", /* Base directory to resolve non-absolute module names. */
	// "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
	// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
	// "typeRoots": [], /* List of folders to include type definitions from. */
	// "types": ["node", "jest"] /* Type declaration files to be included in compilation. */,
	// "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
	"esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
	// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
	// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
	/* Source Map Options */
	// "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
	// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
	// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
	// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
	/* Experimental Options */
	// "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
	// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
	/* Advanced Options */
	"skipLibCheck": true /* Skip type checking of declaration files. */,
	"forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
	},
	"include": ["src/**/*.ts"],
	"exclude": ["node_modules", "**/*.test.ts", "dist"]

Step 2: ⌨️ Coding

src/index.ts

Update the `RateResponse` type to be an array of `RateObj`.

--- 
+++ 
@@ -1,5 +1,5 @@
 /**
  * The response from the exchange rates API.
- * Can be a single exchange rate or an array of exchange rates.
+ * An array of exchange rates.
  */
-export type RateResponse = RateObj | [RateObj];
+export type RateResponse = RateObj[];

src/index.ts

Update the type of the `data` variable in the `res.on('end', ...)` callback to be `RateObj[]`.

--- 
+++ 
@@ -1,6 +1,6 @@
 res.on('end', () => {
   try {
-    const { data } = JSON.parse(dataBuffer);
+    const { data } = JSON.parse(dataBuffer) as { data: RateObj[] };
     return resolve(data);
   } catch (err) {
     return reject(err as Error);

src/index.ts

Update the return type of the `get` function to be `Promise`.

--- 
+++ 
@@ -1,4 +1,4 @@
-export const get = (code?: string): Promise<RateResponse> => {
+export const get = (code?: string): Promise<RateObj[]> => {
   if (typeof code === 'string') {
     defaultOptions.path += `/${code.toUpperCase()}`;
   }

Step 3: 🔄️ Validating

Your changes have been successfully made to the branch sweep/fix_the_typing_error_when_run_tests_with_768cc. I have validated these changes using a syntax checker and a linter.

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