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API Extractor plugin

Plugin package:@rushstack/heft-api-extractor-plugin
Plugin name:api-extractor-plugin implemented by ApiExtractorPlugin.ts
Plugin config file:api-extractor-task.json
heft.json options:(none)

This plugin invokes the API Extractor tool which reads TypeScript declarations (.d.ts files) as inputs and produces three types of outputs:

1. API Report - API Extractor can trace all exports from your project's main entry point and generate a report to be used as the basis for an API review workflow.

2. .d.ts Rollups - Similar to how Webpack can "roll up" all your JavaScript files into a single .js file for distribution, API Extractor can roll up your TypeScript declarations into a single .d.ts file.

3. API Documentation - API Extractor can generate a "doc model" JSON file for each of your projects. This JSON file contains the extracted type signatures and doc comments. The api-documenter companion tool can use these files to generate an API reference website, or you can use them as inputs for a custom documentation pipeline.

See the API Extractor documentation for details about how it works.

When to use it​

We recommend to use API Extractor for every TypeScript library project, especially if it is published as an NPM package.

package.json dependencies​

If you are using a standard rig such as @rushstack/heft-node-rig or @rushstack/heft-web-rig, then API Extractor will already be loaded and configured.

Otherwise, you'll need to add these packages to your project:

# If you are using Rush, run this shell command in your project folder:
rush add --package @rushstack/heft-api-extractor-plugin --dev
rush add --package @microsoft/api-extractor --dev

Configuration​

If API Extractor is not already being provided by a rig, your heft.json config file could invoke it like in this example:

<project folder>/config/heft.json

{
  "$schema": "https://developer.microsoft.com/json-schemas/heft/v0/heft.schema.json",
  . . .
  "phasesByName": {
    "build": {
      "cleanFiles": [{ "sourcePath": "dist" }, { "sourcePath": "lib" }, { "sourcePath": "lib-commonjs" }],
      "tasksByName": {
        "typescript": {
          "taskPlugin": {
            "pluginPackage": "@rushstack/heft-typescript-plugin"
          }
        },
        "api-extractor": {
          "taskDependencies": ["typescript"],
          "taskPlugin": {
            "pluginPackage": "@rushstack/heft-api-extractor-plugin"
          }
        },
        . . .
      }
    }
    . . .
  }
}

Heft looks for API Extractor's config file config/api-extractor.json. This file can be created by invoking the api-extractor init command. This file is riggable.

For advanced scenarios, the optional api-extractor-task.json config file provides some additional Heft-specific settings.

See also​