Function createVariant

src/transpilers/swc.ts:205–269

(isTsx: boolean)

  return { nonTsxOptions, tsxOptions };

  function createVariant(isTsx: boolean): swcTypes.Options {
    const swcOptions: swcTypes.Options = {
      sourceMaps: sourceMap,
      // isModule: true,
      module: moduleType
        ? {
            type: moduleType,
            ...(moduleType === 'amd' || moduleType === 'commonjs' || moduleType === 'umd'
              ? {
                  noInterop: !esModuleInterop,
                  strictMode,
                  // For NodeNext and Node12, emit as CJS but do not transform dynamic imports
                  ignoreDynamic: nodeModuleEmitKind === 'nodecjs',
                }
              : {}),
          }
        : undefined,
      swcrc: false,
      jsc: {
        externalHelpers: importHelpers,
        parser: {
          syntax: 'typescript',
          tsx: isTsx,
          decorators: experimentalDecorators,
          dynamicImport: true,
          importAssertions: true,
        } as swcWasm.TsParserConfig,
        target: swcTarget as swcWasm.JscTarget,
        transform: {
          decoratorMetadata: emitDecoratorMetadata,
          legacyDecorator: true,
          react: {
            throwIfNamespace: false,
            development: jsxDevelopment,
            useBuiltins: false,
            pragma: jsxFactory!,
            pragmaFrag: jsxFragmentFactory!,
            runtime: jsxRuntime,
            importSource: jsxImportSource,
          },
          useDefineForClassFields,
        },
        keepClassNames,
        experimental: {
          keepImportAttributes: true,
          emitAssertForImportAttributes: true,
        } as swcTypes.JscConfig['experimental'],
      },
    };

    // Throw a helpful error if swc version is old, for example, if it rejects `ignoreDynamic`
    try {
      swcInstance.transformSync('', swcOptions);
    } catch (e) {
      throw new Error(
        `${swcDepName} threw an error when attempting to validate swc compiler options.\n` +
          'You may be using an old version of swc which does not support the options used by ts-node.\n' +
          'Try upgrading to the latest version of swc.\n' +