Function transformFixtureInput

compiler/packages/snap/src/compiler.ts:215–369

(
  input: string,
  fixturePath: string,
  parseConfigPragmaFn: typeof ParseConfigPragma,
  plugin: BabelCore.PluginObj,
  includeEvaluator: boolean,
  debugIRLogger: (value: CompilerPipelineValue) => void,
  EffectEnum: typeof Effect,
  ValueKindEnum: typeof ValueKind,
  ValueReasonEnum: typeof ValueReason,
)

};

export async function transformFixtureInput(
  input: string,
  fixturePath: string,
  parseConfigPragmaFn: typeof ParseConfigPragma,
  plugin: BabelCore.PluginObj,
  includeEvaluator: boolean,
  debugIRLogger: (value: CompilerPipelineValue) => void,
  EffectEnum: typeof Effect,
  ValueKindEnum: typeof ValueKind,
  ValueReasonEnum: typeof ValueReason,
): Promise<{kind: 'ok'; value: TransformResult} | {kind: 'err'; msg: string}> {
  // Extract the first line to quickly check for custom test directives
  const firstLine = input.substring(0, input.indexOf('\n'));

  const language = parseLanguage(firstLine);
  const sourceType = parseSourceType(firstLine);
  // Preserve file extension as it determines typescript's babel transform
  // mode (e.g. stripping types, parsing rules for brackets)
  const filename =
    path.basename(fixturePath) + (language === 'typescript' ? '.ts' : '');
  const inputAst = parseInput(input, filename, language, sourceType);
  // Give babel transforms an absolute path as relative paths get prefixed
  // with `cwd`, which is different across machines
  const virtualFilepath = '/' + filename;

  const presets =
    language === 'typescript'
      ? TypescriptEvaluatorPresets
      : FlowEvaluatorPresets;

  /**
   * Get Forget compiled code
   */
  const [options, logs] = makePluginOptions(
    firstLine,
    parseConfigPragmaFn,
    debugIRLogger,
    EffectEnum,
    ValueKindEnum,
    ValueReasonEnum,
  );
  const forgetResult = transformFromAstSync(inputAst, input, {
    filename: virtualFilepath,
    highlightCode: false,
    retainLines: true,
    compact: true,
    plugins: [
      [plugin, options],
      'babel-plugin-fbt',
      'babel-plugin-fbt-runtime',
      'babel-plugin-idx',
    ],
    sourceType: 'module',
    ast: includeEvaluator,
    cloneInputAst: includeEvaluator,
    configFile: false,
    babelrc: false,
  });