export function emitWithTsickle()

in packages/concatjs/internal/tsc_wrapped/tsc_wrapped.ts [514:603]
73 lines of code
14 McCabe index (conditional complexity)

export function emitWithTsickle(
    program: ts.Program, compilerHost: CompilerHost,
    compilationTargets: ts.SourceFile[], options: ts.CompilerOptions,
    bazelOpts: BazelOptions,
    transforms: ts.CustomTransformers): ts.Diagnostic[] {
  const emitResults: tsickle.EmitResult[] = [];
  const diagnostics: ts.Diagnostic[] = [];
  // The 'tsickle' import above is only used in type positions, so it won't
  // result in a runtime dependency on tsickle.
  // If the user requests the tsickle emit, then we dynamically require it
  // here for use at runtime.
  let optTsickle: typeof tsickle;
  try {
    // tslint:disable-next-line:no-require-imports
    optTsickle = require('tsickle');
  } catch (e) {
    if (e.code !== 'MODULE_NOT_FOUND') {
      throw e;
    }
    throw new Error(
        'When setting bazelOpts { tsickle: true }, ' +
        'you must also add a devDependency on the tsickle npm package');
  }
  perfTrace.wrap('emit', () => {
    for (const sf of compilationTargets) {
      perfTrace.wrap(`emit ${sf.fileName}`, () => {
        emitResults.push(optTsickle.emitWithTsickle(
            program, compilerHost, compilerHost, options, sf,
            /*writeFile*/ undefined,
            /*cancellationToken*/ undefined, /*emitOnlyDtsFiles*/ undefined, {
              beforeTs: transforms.before,
              afterTs: transforms.after,
              afterDeclarations: transforms.afterDeclarations,
            }));
      });
    }
  });
  const emitResult = optTsickle.mergeEmitResults(emitResults);
  diagnostics.push(...emitResult.diagnostics);

  // If tsickle reported diagnostics, don't produce externs or manifest outputs.
  if (diagnostics.length > 0) {
    return diagnostics;
  }

  let externs = '/** @externs */\n' +
      '// generating externs was disabled using generate_externs=False\n';
  if (bazelOpts.tsickleGenerateExterns) {
    externs =
        optTsickle.getGeneratedExterns(emitResult.externs, options.rootDir!);
  }

  if (!options.noEmit && bazelOpts.tsickleExternsPath) {
    // Note: when tsickleExternsPath is provided, we always write a file as a
    // marker that compilation succeeded, even if it's empty (just containing an
    // @externs).
    fs.writeFileSync(bazelOpts.tsickleExternsPath, externs);

    // When generating externs, generate an externs file for each of the input
    // .d.ts files.
    if (bazelOpts.tsickleGenerateExterns &&
        compilerHost.provideExternalModuleDtsNamespace) {
      for (const extern of compilationTargets) {
        if (!extern.isDeclarationFile) continue;
        const outputBaseDir = options.outDir!;
        const relativeOutputPath =
            compilerHost.relativeOutputPath(extern.fileName);
        mkdirp(outputBaseDir, path.dirname(relativeOutputPath));
        const outputPath = path.join(outputBaseDir, relativeOutputPath);
        const moduleName = compilerHost.pathToModuleName('', extern.fileName);
        fs.writeFileSync(
            outputPath,
            `goog.module('${moduleName}');\n` +
                `// Export an empty object of unknown type to allow imports.\n` +
                `// TODO: use typeof once available\n` +
                `exports = /** @type {?} */ ({});\n`);
      }
    }
  }

  if (!options.noEmit && bazelOpts.manifest) {
    perfTrace.wrap('manifest', () => {
      const manifest =
          constructManifest(emitResult.modulesManifest, compilerHost);
      fs.writeFileSync(bazelOpts.manifest, manifest);
    });
  }

  return diagnostics;
}