feat: add example code snippet to README (#809)

* refactor: move getExampleCodeSnippet to its own file

there's probably an opportunity here to consolidate stuff since we call this twice

* feat: add example usage to README

* test: update fixtures

* fix: lint

* refactor: move getExampleCodeSnippet to class function

* docs: add JSDocs for CodeGenerator properties

Author: kanadgupta

packages/api/src/codegen/codegenerator.ts

@@ -8,18 +8,43 @@ import { findLicense } from 'license';
 import { PACKAGE_NAME, PACKAGE_VERSION } from '../packageInfo.js';
 
 export default abstract class CodeGenerator {
+  /** The associated API definition */
   spec: Oas;
 
+  /**
+   * The path to the API definion (might be a local path, a URL, or an API registry identifier)
+   * @example https://raw.githubusercontent.com/readmeio/oas-examples/main/3.0/json/petstore-simple.json
+   * @example @petstore/v1.0#n6kvf10vakpemvplx
+   * @example ./petstore.json
+   */
   specPath: string;
 
+  /**
+   * The user-specified identifier for the SDK,
+   * used as the directory name in the `.api/apis` directory
+   * where the SDK source code is located.
+   */
   identifier: string;
 
+  /** The user agent which is set for all outgoing fetch requests */
   userAgent: string;
 
+  /**
+   * The license associated with the SDK.
+   * This is extrapolated from the API definition file.
+   */
   spdxLicense?: string;
 
+  /**
+   * Contact info for the API and/or SDK author in case users need support.
+   * This is extrapolated from the API definition file.
+   */
   apiContact: { name?: string; url?: string } = {};
 
+  /**
+   * An object containing any downstream packages that are required
+   * for building/executing the SDK.
+   */
   requiredPackages!: Record<
     string,
     {
@@ -30,6 +55,11 @@ export default abstract class CodeGenerator {
     }
   >;
 
+  /**
+   * An example code snippet that a user can run to get started with the SDK.
+   */
+  exampleCodeSnippet?: string | false;
+
   constructor(spec: Oas, specPath: string, identifier: string) {
     this.spec = spec;
     this.specPath = specPath;
@@ -112,6 +142,8 @@ export default abstract class CodeGenerator {
 
   abstract compile(storage: Storage, opts?: InstallerOptions): Promise<void>;
 
+  abstract getExampleCodeSnippet(): Promise<string | false>;
+
   hasRequiredPackages() {
     return Boolean(Object.keys(this.requiredPackages));
   }

packages/api/src/codegen/languages/typescript/index.ts

@@ -26,6 +26,7 @@ import setWith from 'lodash.setwith';
 import semver from 'semver';
 import { IndentationText, Project, QuoteKind, ScriptTarget, VariableDeclarationKind } from 'ts-morph';
 
+import { buildCodeSnippetForOperation, getSuggestedOperation } from '../../../lib/suggestedOperations.js';
 import logger from '../../../logger.js';
 import { PACKAGE_VERSION } from '../../../packageInfo.js';
 import Storage from '../../../storage.js';
@@ -213,7 +214,7 @@ export default class TSGenerator extends CodeGenerator {
     this.createGitIgnore();
     this.createPackageJSON();
     this.createTSConfig();
-    this.createREADME();
+    await this.createREADME();
 
     if (Object.keys(this.schemas).length) {
       this.createSchemasFile(srcDirectory);
@@ -260,6 +261,23 @@ export default class TSGenerator extends CodeGenerator {
     ].reduce((prev, next) => Object.assign(prev, next));
   }
 
+  async getExampleCodeSnippet() {
+    // if we've already built the code snippet, return it instead of re-building it!
+    if (typeof this.exampleCodeSnippet !== 'undefined') {
+      return this.exampleCodeSnippet;
+    }
+
+    const operation = getSuggestedOperation(this.spec);
+    if (!operation) {
+      this.exampleCodeSnippet = false;
+      return false;
+    }
+
+    const snippet = await buildCodeSnippetForOperation(this.spec, operation, { identifier: this.identifier });
+    this.exampleCodeSnippet = snippet;
+    return snippet;
+  }
+
   /**
    * Create our main SDK source file.
    *
@@ -641,15 +659,28 @@ dist/
    * Create a placeholder `README.md` file in the repository, with information on how to use/administer the SDK.
    *
    */
-  createREADME() {
+  async createREADME() {
     let createdAt = new Date().toISOString();
     const currentAPI = Storage.getLockfile().apis.find(api => api.identifier === this.identifier);
     if (currentAPI) createdAt = currentAPI.createdAt;
+
+    let exampleUsage = 'Add SDK setup information and usage examples here so your users get started in a jiffy! 🚀';
+    const exampleSnippet = await this.getExampleCodeSnippet();
+    if (exampleSnippet) {
+      exampleUsage = `
+## Example Usage 🚀
+
+\`\`\`js
+${exampleSnippet}
+\`\`\`
+`.trim();
+    }
+
     const file = `# \`@api/${this.identifier}\`
 
 This SDK was autogenerated by the [\`api\` SDK generator](https://api.readme.dev), powered by [ReadMe](https://readme.com) 🦉
 
-Add SDK setup information and usage examples here so your users get started in a jiffy! 🚀
+${exampleUsage}
 
 <!---
 

packages/api/src/commands/install.ts

@@ -11,7 +11,6 @@ import uslug from 'uslug';
 import { SupportedLanguages, codegenFactory } from '../codegen/factory.js';
 import Fetcher from '../fetcher.js';
 import promptTerminal from '../lib/prompt.js';
-import { buildCodeSnippetForOperation, getSuggestedOperation } from '../lib/suggestedOperations.js';
 import logger, { oraOptions } from '../logger.js';
 import Storage from '../storage.js';
 
@@ -71,15 +70,6 @@ async function getIdentifier(oas: Oas, uri: string, options: Options) {
   return identifier;
 }
 
-async function getExampleCodeSnippet(oas: Oas, identifier: string) {
-  const operation = getSuggestedOperation(oas);
-  if (!operation) {
-    return false;
-  }
-
-  return buildCodeSnippetForOperation(oas, operation, { identifier });
-}
-
 // @todo log logs to `.api/.logs` and have `.logs` ignored
 const cmd = new Command();
 cmd
@@ -213,7 +203,7 @@ cmd
       )} package.`,
     );
 
-    const exampleSnippet = await getExampleCodeSnippet(oas, identifier);
+    const exampleSnippet = await generator.getExampleCodeSnippet();
     if (exampleSnippet) {
       logger('');
       logger(chalk.bold("👇 Here's an example code snippet you can try out 👇"));

packages/test-utils/sdks/alby/README.md

@@ -2,7 +2,16 @@
 
 This SDK was autogenerated by the [`api` SDK generator](https://api.readme.dev), powered by [ReadMe](https://readme.com) 🦉
 
-Add SDK setup information and usage examples here so your users get started in a jiffy! 🚀
+## Example Usage 🚀
+
+```js
+import alby from '@api/alby';
+
+alby.auth('token');
+alby.getMe()
+  .then(({ data }) => console.log(data))
+  .catch(err => console.error(err));
+```
 
 <!---
 

packages/test-utils/sdks/metrotransit/README.md

@@ -2,7 +2,15 @@
 
 This SDK was autogenerated by the [`api` SDK generator](https://api.readme.dev), powered by [ReadMe](https://readme.com) 🦉
 
-Add SDK setup information and usage examples here so your users get started in a jiffy! 🚀
+## Example Usage 🚀
+
+```js
+import metrotransit from '@api/metrotransit';
+
+metrotransit.getNextripAgencies()
+  .then(({ data }) => console.log(data))
+  .catch(err => console.error(err));
+```
 
 <!---
 

packages/test-utils/sdks/operationid-quirks/README.md

@@ -2,7 +2,15 @@
 
 This SDK was autogenerated by the [`api` SDK generator](https://api.readme.dev), powered by [ReadMe](https://readme.com) 🦉
 
-Add SDK setup information and usage examples here so your users get started in a jiffy! 🚀
+## Example Usage 🚀
+
+```js
+import operationidQuirks from '@api/operationid-quirks';
+
+operationidQuirks.quirky_OperationId_string()
+  .then(({ data }) => console.log(data))
+  .catch(err => console.error(err));
+```
 
 <!---
 

packages/test-utils/sdks/petstore/README.md

@@ -2,7 +2,16 @@
 
 This SDK was autogenerated by the [`api` SDK generator](https://api.readme.dev), powered by [ReadMe](https://readme.com) 🦉
 
-Add SDK setup information and usage examples here so your users get started in a jiffy! 🚀
+## Example Usage 🚀
+
+```js
+import petstore from '@api/petstore';
+
+petstore.auth('token');
+petstore.getInventory()
+  .then(({ data }) => console.log(data))
+  .catch(err => console.error(err));
+```
 
 <!---
 

packages/test-utils/sdks/readme/README.md

@@ -2,7 +2,16 @@
 
 This SDK was autogenerated by the [`api` SDK generator](https://api.readme.dev), powered by [ReadMe](https://readme.com) 🦉
 
-Add SDK setup information and usage examples here so your users get started in a jiffy! 🚀
+## Example Usage 🚀
+
+```js
+import readme from '@api/readme';
+
+readme.auth('username', 'password');
+readme.getAPISpecification()
+  .then(({ data }) => console.log(data))
+  .catch(err => console.error(err));
+```
 
 <!---
 

packages/test-utils/sdks/star-trek/README.md

@@ -2,7 +2,15 @@
 
 This SDK was autogenerated by the [`api` SDK generator](https://api.readme.dev), powered by [ReadMe](https://readme.com) 🦉
 
-Add SDK setup information and usage examples here so your users get started in a jiffy! 🚀
+## Example Usage 🚀
+
+```js
+import starTrek from '@api/star-trek';
+
+starTrek.getAnimalSearch()
+  .then(({ data }) => console.log(data))
+  .catch(err => console.error(err));
+```
 
 <!---