compiler.ts

import * as ts from 'typescript'
import { sync as globSync } from 'glob'
import { transformer } from './src'

const CJS_CONFIG: ts.CompilerOptions = {
  experimentalDecorators: true,
  jsx: ts.JsxEmit.React,
  module: ts.ModuleKind.ESNext,
  moduleResolution: ts.ModuleResolutionKind.NodeJs,
  noEmitOnError: false,
  noUnusedLocals: true,
  noUnusedParameters: true,
  stripInternal: true,
  declaration: true,
  baseUrl: __dirname,
  target: ts.ScriptTarget.ES2016
}

export default function compile(
  input: string,
  options: ts.CompilerOptions = CJS_CONFIG
) {
  const files = globSync(input)
  const compilerHost = ts.createCompilerHost(options)
  const program = ts.createProgram(files, options, compilerHost)

  const msgs = {}

  const emitResult = program.emit(undefined, undefined, undefined, undefined, {
    before: [transformer()]
  })

  const allDiagnostics = ts
    .getPreEmitDiagnostics(program)
    .concat(emitResult.diagnostics)

  allDiagnostics.forEach(diagnostic => {
    const { line, character } = diagnostic.file.getLineAndCharacterOfPosition(
      diagnostic.start
    )
    const message = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n')
    console.info(
      `${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`
    )
  })

  return msgs
}