Builder.ts

/*
 * @poppinss/chokidar-ts
 *
 * (c) Harminder Virk <virk@adonisjs.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

import Debug from 'debug'
import tsStatic from 'typescript'
import { PluginManager } from './PluginManager'

const debug = Debug('tsc:builder')

/**
 * Exposes the API to build the project similar to `tsc` command.
 */
export class Builder {
  public host: tsStatic.CompilerHost
  public program: tsStatic.Program
  public compilerOptions?: tsStatic.CompilerOptions

  constructor(
    private ts: typeof tsStatic,
    private config: tsStatic.ParsedCommandLine,
    private pluginManager: PluginManager
  ) {
    debug('initiating builder')
  }

  /**
   * Create typescript program
   */
  public createProgram() {
    const { options, fileNames } = this.config
    this.host = this.ts.createCompilerHost(options)
    this.program = this.ts.createProgram(fileNames, options, this.host)
    this.compilerOptions = this.config.options
  }

  /**
   * Build the project using the Typescript compiler API
   */
  public build() {
    this.createProgram()

    debug('emitting program')
    const result = this.program.emit(
      undefined,
      this.ts.sys.writeFile,
      undefined,
      undefined,
      this.pluginManager.getTransformers(this.ts, this.config.options)
    )

    const diagnostics = this.ts.getPreEmitDiagnostics(this.program).concat(result.diagnostics)
    debug('initial build has "%d" errors', diagnostics.length)

    return {
      skipped: result.emitSkipped,
      diagnostics,
    }
  }
}