typescript.ts

import * as path from "path";
import * as semver from "semver";
import { PROJEN_DIR, PROJEN_RC } from "../common";
import { Component } from "../component";
import {
  Eslint,
  EslintOptions,
  Jest,
  NodeProject,
  NodeProjectOptions,
  TypeScriptCompilerOptions,
  TypescriptConfig,
  TypescriptConfigOptions,
} from "../javascript";
import { SampleDir } from "../sample-file";
import { Task } from "../task";
import { TextFile } from "../textfile";
import {
  Projenrc as ProjenrcTs,
  ProjenrcOptions as ProjenrcTsOptions,
  TypedocDocgen,
} from "../typescript";

export interface TypeScriptProjectOptions extends NodeProjectOptions {
  /**
   * Typescript  artifacts output directory
   *
   * @default "lib"
   */
  readonly libdir?: string;

  /**
   * Typescript sources directory.
   *
   * @default "src"
   */
  readonly srcdir?: string;

  /**
   * Jest tests directory. Tests files should be named `xxx.test.ts`.
   *
   * If this directory is under `srcdir` (e.g. `src/test`, `src/__tests__`),
   * then tests are going to be compiled into `lib/` and executed as javascript.
   * If the test directory is outside of `src`, then we configure jest to
   * compile the code in-memory.
   *
   * @default "test"
   */
  readonly testdir?: string;

  /**
   * Setup eslint.
   *
   * @default true
   */
  readonly eslint?: boolean;

  /**
   * Eslint options
   * @default - opinionated default options
   */
  readonly eslintOptions?: EslintOptions;

  /**
   * TypeScript version to use.
   *
   * NOTE: Typescript is not semantically versioned and should remain on the
   * same minor, so we recommend using a `~` dependency (e.g. `~1.2.3`).
   *
   * @default "latest"
   */
  readonly typescriptVersion?: string;

  /**
   * Docgen by Typedoc
   *
   * @default false
   */
  readonly docgen?: boolean;

  /**
   * Docs directory
   *
   * @default "docs"
   */
  readonly docsDirectory?: string;

  /**
   * Custom TSConfig
   * @default - default options
   */
  readonly tsconfig?: TypescriptConfigOptions;

  /**
   * Custom tsconfig options for the development tsconfig.json file (used for testing).
   * @default - use the production tsconfig options
   */
  readonly tsconfigDev?: TypescriptConfigOptions;

  /**
   * The name of the development tsconfig.json file.
   *
   * @default "tsconfig.dev.json"
   */
  readonly tsconfigDevFile?: string;

  /**
   * Do not generate a `tsconfig.json` file (used by jsii projects since
   * tsconfig.json is generated by the jsii compiler).
   *
   * @default false
   */
  readonly disableTsconfig?: boolean;

  /**
   * Generate one-time sample in `src/` and `test/` if there are no files there.
   * @default true
   */
  readonly sampleCode?: boolean;

  /**
   * The .d.ts file that includes the type declarations for this module.
   * @default - .d.ts file derived from the project's entrypoint (usually lib/index.d.ts)
   */
  readonly entrypointTypes?: string;

  /**
   * Use TypeScript for your projenrc file (`.projenrc.ts`).
   *
   * @default false
   */
  readonly projenrcTs?: boolean;

  /**
   * Options for .projenrc.ts
   */
  readonly projenrcTsOptions?: ProjenrcTsOptions;
}

/**
 * TypeScript project
 * @pjid typescript
 */
export class TypeScriptProject extends NodeProject {
  public readonly docgen?: boolean;
  public readonly docsDirectory: string;
  public readonly eslint?: Eslint;
  public readonly tsconfigEslint?: TypescriptConfig;
  public readonly tsconfig?: TypescriptConfig;

  /**
   * A typescript configuration file which covers all files (sources, tests, projen).
   */
  public readonly tsconfigDev: TypescriptConfig;

  /**
   * The directory in which the .ts sources reside.
   */
  public readonly srcdir: string;

  /**
   * The directory in which compiled .js files reside.
   */
  public readonly libdir: string;

  /**
   * The directory in which tests reside.
   */
  public readonly testdir: string;

  /**
   * The "watch" task.
   */
  public readonly watchTask: Task;

  constructor(options: TypeScriptProjectOptions) {
    super({
      ...options,

      // disable .projenrc.js if typescript is enabled
      projenrcJs: options.projenrcTs ? false : options.projenrcJs,

      jestOptions: {
        ...options.jestOptions,
        jestConfig: {
          ...options.jestOptions?.jestConfig,
          testMatch: [],
        },
      },
    });

    this.srcdir = options.srcdir ?? "src";
    this.libdir = options.libdir ?? "lib";

    this.docgen = options.docgen;
    this.docsDirectory = options.docsDirectory ?? "docs/";

    this.compileTask.exec("tsc --build");

    this.watchTask = this.addTask("watch", {
      description: "Watch & compile in the background",
      exec: "tsc --build -w",
    });

    this.testdir = options.testdir ?? "test";
    this.gitignore.include(`/${this.testdir}/`);
    this.npmignore?.exclude(`/${this.testdir}/`);

    // if the test directory is under `src/`, then we will run our tests against
    // the javascript files and not let jest compile it for us.
    const compiledTests = this.testdir.startsWith(this.srcdir + path.posix.sep);

    if (options.entrypointTypes || this.entrypoint !== "") {
      const entrypointTypes =
        options.entrypointTypes ??
        `${path
          .join(
            path.dirname(this.entrypoint),
            path.basename(this.entrypoint, ".js")
          )
          .replace(/\\/g, "/")}.d.ts`;
      this.package.addField("types", entrypointTypes);
    }

    const compilerOptionDefaults: TypeScriptCompilerOptions = {
      alwaysStrict: true,
      declaration: true,
      esModuleInterop: true,
      experimentalDecorators: true,
      inlineSourceMap: true,
      inlineSources: true,
      lib: ["es2019"],
      module: "CommonJS",
      noEmitOnError: false,
      noFallthroughCasesInSwitch: true,
      noImplicitAny: true,
      noImplicitReturns: true,
      noImplicitThis: true,
      noUnusedLocals: true,
      noUnusedParameters: true,
      resolveJsonModule: true,
      strict: true,
      strictNullChecks: true,
      strictPropertyInitialization: true,
      stripInternal: true,
      target: "ES2019",
    };

    if (!options.disableTsconfig) {
      this.tsconfig = new TypescriptConfig(
        this,
        mergeTsconfigOptions(
          {
            include: [`${this.srcdir}/**/*.ts`],
            // exclude: ['node_modules'], // TODO: shouldn't we exclude node_modules?
            compilerOptions: {
              rootDir: this.srcdir,
              outDir: this.libdir,
              ...compilerOptionDefaults,
            },
          },
          options.tsconfig
        )
      );
    }

    const tsconfigDevFile = options.tsconfigDevFile ?? "tsconfig.dev.json";
    this.tsconfigDev = new TypescriptConfig(
      this,
      mergeTsconfigOptions(
        {
          fileName: tsconfigDevFile,
          include: [
            PROJEN_RC,
            `${this.srcdir}/**/*.ts`,
            `${this.testdir}/**/*.ts`,
          ],
          exclude: ["node_modules"],
          compilerOptions: compilerOptionDefaults,
        },
        options.tsconfig,
        options.tsconfigDev
      )
    );

    this.gitignore.include(`/${this.srcdir}/`);
    this.npmignore?.exclude(`/${this.srcdir}/`);

    if (this.srcdir !== this.libdir) {
      // separated, can ignore the entire libdir
      this.gitignore.exclude(`/${this.libdir}`);
    } else {
      // collocated, can only ignore the compiled output
      this.gitignore.exclude(`/${this.libdir}/**/*.js`);
      this.gitignore.exclude(`/${this.libdir}/**/*.d.ts`);
    }

    this.npmignore?.include(`/${this.libdir}/`);

    this.npmignore?.include(`/${this.libdir}/**/*.js`);
    this.npmignore?.include(`/${this.libdir}/**/*.d.ts`);

    this.gitignore.exclude("/dist/");
    this.npmignore?.exclude("dist"); // jsii-pacmak expects this to be "dist" and not "/dist". otherwise it will tamper with it

    this.npmignore?.exclude("/tsconfig.json");
    this.npmignore?.exclude("/.github/");
    this.npmignore?.exclude("/.vscode/");
    this.npmignore?.exclude("/.idea/");
    this.npmignore?.exclude("/.projenrc.js");
    this.npmignore?.exclude("tsconfig.tsbuildinfo");

    if (this.jest) {
      if (compiledTests) {
        this.addJestCompiled(this.jest);
      } else {
        this.addJestNoCompile(this.jest);
      }
    }

    const projenrcTypeScript = options.projenrcTs ?? false;
    if (projenrcTypeScript) {
      new ProjenrcTs(this, options.projenrcTsOptions);
    }

    const projenRcFilename = projenrcTypeScript
      ? options.projenrcTsOptions?.filename ?? ".projenrc.ts"
      : undefined;

    if (options.eslint ?? true) {
      this.eslint = new Eslint(this, {
        tsconfigPath: `./${this.tsconfigDev.fileName}`,
        dirs: [this.srcdir],
        devdirs: [this.testdir, "build-tools"],
        fileExtensions: [".ts", ".tsx"],
        lintProjenRcFile: projenRcFilename,
        ...options.eslintOptions,
      });

      this.tsconfigEslint = this.tsconfigDev;
    }

    const tsver = options.typescriptVersion
      ? `@${options.typescriptVersion}`
      : "";

    this.addDevDeps(
      `typescript${tsver}`,
      // @types/node versions numbers match the node runtime versions' major.minor, however, new
      // releases are only created when API changes are included in a node release... We might for
      // example have dependencies that require `node >= 12.22`, but as 12.21 and 12.22 did not
      // include API changes, `@types/node@12.20.x` is the "correct" version to use. As it is not
      // possible to easily determine the correct version to use, we pick up the latest version.
      //
      // Additionally, we default to tracking the 12.x line, as the current earliest LTS release of
      // node is 12.x, so this is what corresponds to the broadest compatibility with supported node
      // runtimes.
      `@types/node@^${semver.major(this.package.minNodeVersion ?? "14.0.0")}`
    );

    // generate sample code in `src` and `lib` if these directories are empty or non-existent.
    if (options.sampleCode ?? true) {
      new SampleCode(this);
    }

    if (this.docgen) {
      new TypedocDocgen(this);
    }
  }

  /**
   * Tests are compiled to `lib/TESTDIR`, so we don't need jest to compile them
   * for us. just run them directly from javascript.
   */
  private addJestCompiled(jest: Jest) {
    this.addDevDeps("@types/jest");

    const testout = path.posix.relative(this.srcdir, this.testdir);
    const libtest = path.posix.join(this.libdir, testout);
    const srctest = this.testdir;

    this.npmignore?.exclude(`/${libtest}/`);
    jest.addTestMatch(`**/${libtest}/**/?(*.)+(spec|test).js?(x)`);
    jest.addWatchIgnorePattern(`/${this.srcdir}/`);

    const resolveSnapshotPath = (test: string, ext: string) => {
      const fullpath = test.replace(libtest, srctest);
      return path.join(
        path.dirname(fullpath),
        "__snapshots__",
        path.basename(fullpath, ".js") + ".ts" + ext
      );
    };

    const resolveTestPath = (snap: string, ext: string) => {
      const filename = path.basename(snap, ".ts" + ext) + ".js";
      const dir = path.dirname(path.dirname(snap)).replace(srctest, libtest);
      return path.join(dir, filename);
    };

    const resolver = new TextFile(
      this,
      path.posix.join(PROJEN_DIR, "jest-snapshot-resolver.js")
    );
    if (!resolver.marker) {
      resolver.addLine(`// ${resolver.marker}`);
    }
    resolver.addLine('const path = require("path");');
    resolver.addLine(`const libtest = "${libtest}";`);
    resolver.addLine(`const srctest= "${srctest}";`);
    resolver.addLine("module.exports = {");
    resolver.addLine(
      `  resolveSnapshotPath: ${resolveSnapshotPath.toString()},`
    );
    resolver.addLine(`  resolveTestPath: ${resolveTestPath.toString()},`);
    resolver.addLine(
      "  testPathForConsistencyCheck: path.join('some', '__tests__', 'example.test.js')"
    );
    resolver.addLine("};");

    jest.addSnapshotResolver(`./${resolver.path}`);
  }

  private addJestNoCompile(jest: Jest) {
    this.addDevDeps("@types/jest", "ts-jest@^27"); // pinning for now because of an issue: https://github.com/projen/projen/issues/1813

    jest.addTestMatch(`<rootDir>/${this.srcdir}/**/__tests__/**/*.ts?(x)`);
    jest.addTestMatch(
      `<rootDir>/(${this.testdir}|${this.srcdir})/**/?(*.)+(spec|test).ts?(x)`
    );

    // add relevant deps
    jest.config.preset = "ts-jest";
    jest.config.globals = {
      "ts-jest": {
        tsconfig: this.tsconfigDev.fileName,
      },
    };
  }
}

class SampleCode extends Component {
  constructor(project: TypeScriptProject) {
    super(project);
    const srcCode = [
      "export class Hello {",
      "  public sayHello() {",
      "    return 'hello, world!';",
      "  }",
      "}",
    ].join("\n");

    const testCode = [
      "import { Hello } from '../src';",
      "",
      "test('hello', () => {",
      "  expect(new Hello().sayHello()).toBe('hello, world!');",
      "});",
    ].join("\n");

    new SampleDir(project, project.srcdir, {
      files: {
        "index.ts": srcCode,
      },
    });

    new SampleDir(project, project.testdir, {
      files: {
        "hello.test.ts": testCode,
      },
    });
  }
}

/**
 * TypeScript app.
 *
 * @pjid typescript-app
 */
export class TypeScriptAppProject extends TypeScriptProject {
  constructor(options: TypeScriptProjectOptions) {
    super({
      allowLibraryDependencies: false,
      releaseWorkflow: false,
      entrypoint: "", // "main" is not needed in typescript apps
      package: false,
      ...options,
    });
  }
}

/**
 * @deprecated use `TypeScriptProject`
 */
export class TypeScriptLibraryProject extends TypeScriptProject {}

/**
 * @deprecated use TypeScriptProjectOptions
 */
export interface TypeScriptLibraryProjectOptions
  extends TypeScriptProjectOptions {}

/**
 * @internal
 */
export function mergeTsconfigOptions(
  ...options: (TypescriptConfigOptions | undefined)[]
): TypescriptConfigOptions {
  const definedOptions = options.filter(Boolean) as TypescriptConfigOptions[];
  return definedOptions.reduce<TypescriptConfigOptions>(
    (previous, current) => ({
      ...previous,
      ...current,
      include: [...(previous.include ?? []), ...(current.include ?? [])],
      exclude: [...(previous.exclude ?? []), ...(current.exclude ?? [])],
      compilerOptions: {
        ...previous.compilerOptions,
        ...current.compilerOptions,
      },
    }),
    { compilerOptions: {} }
  );
}